作者： Liu, Ni;Liu, Yunguo*;Tan, Xiaofei;Li, Meifang;Liu, Shaobo;...

期刊： Science of The Total Environment,2020年715:136723 ISSN：0048-9697

通讯作者： Liu, Yunguo

作者机构： [Liu, Yunguo; Zhang, Peng; Tan, Xiaofei; Li, Meifang; Liu, Ni; Xu, Weihua; Dai, Mingyang] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Peoples R China.;[Liu, Yunguo; Zhang, Peng; Tan, Xiaofei; Li, Meifang; Liu, Ni; Xu, Weihua; Dai, Mingyang] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Peoples R China.;[Liu, Shaobo] Cent South Univ, Sch Architecture & Art, Changsha 410082, Peoples R China.;[Liu, Shaobo] Cent South Univ, Sch Met & Environm, Changsha 410083, Peoples R China.;[Hu, Xinjiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.

通讯机构： [Liu, Yunguo] H;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Peoples R China.

关键词： 17beta-estradiol;Al(2)O(3) nanoparticles;Graphene-like magnetic biochar;Mircoplastics;Potassium ferrate

摘要： A graphene-like magnetic biochar (GLMB) was synthesized using lotus seedpod and potassium ferrate with simple step and applied for E2 adsorption. GLMB was characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscope (AFM), X-ray photoelectron spectroscopy (XPS), Raman, X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and BET surface area. Several common (solution pH, ionic strength, humic acid and foreign ions) and new (Al2O3 nanoparticles and microplastics (MPs)) water experiment conditions were investigated. Characterization results demonstrated that the sample was fabricated successfully and it possessed some graphene-like properties and a large surface area (828.37 m(2)/g). Adsorption results revealed that the pseudo-second-order kinetics and Langmuir isotherm models could provide a better description for E2 uptake behavior. The E2 adsorption capacity could be influenced by solution pH, ionic strength and SO42- ions, and the effect of humic acid and background electrolyte (Na+, K+, Ca2+, Mg2+, Cl-, NO3-, PO43-) could be neglected. The presences of Al2O3/MPs significantly decreased the time to reach adsorption equilibrium for E2 adsorption on GLMB, but had no obvious improvement or inhibiting effects on E2 removal when the adsorption reached equilibrium. The adsorption mechanism for E2 adsorption on GLMB was multiple, which involving n-n interactions, micropore filling effects, electrostatic interaction. The regeneration experiments showed that GLMB possessed a good regeneration performance. Based on the experimental results and comparative analysis with other adsorbents, GLMB was an economical, high-efficiency, green and recyclable adsorbent for E2 removal from aqueous solution. (C) 2020 Published by Elsevier B.

语种： 英文

作者： Hu, Xi*;Hu, Xinjiang*;Peng, Qingqing;Zhou, Lu;Tan, Xiaofei;...

期刊： Chemical Engineering Journal,2020年380:122366 ISSN：1385-8947

通讯作者： Hu, Xi;Hu, Xinjiang

作者机构： [Hu, Xi; Tang, Chunfang; Hu, Xinjiang; Wang, Hui; Hu, X; Hu, XJ; Ning, Ziqi] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Peng, Qingqing] Environm Monitoring Ctr Hunan Prov, Changsha 410004, Hunan, Peoples R China.;[Zhou, Lu] Changsha Univ Sci & Technol, Sch Hydraul Engn, Changsha 410114, Hunan, Peoples R China.;[Tan, Xiaofei] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Jiang, Luhua] Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Hu, X; Hu, XJ] C;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.

关键词： Ciprofloxacin;Heterogeneous TiO2;Intermediates;Photocatalytic degradation;Toxicological assessment

摘要： The presence of antibiotics in different water sources is a ubiquitous, global concern. The persistence of trace amounts of antibiotics can lead to antibiotic resistance of microbial pathogens and jeopardize the health of ecosystems. One possible solution is the photocatalytic degradation of antibiotics from water systems by titanium dioxide (TiO2) photocatalysis. In recent years, heterogeneous TiO2 has been examined for the photocatalytic degradation of ciprofloxacin (CIP) under UV/visible light irradiation. This review offers an overview of the recent advances in visible light-activated TiO2 for the photocatalytic degradation of CIP and the factors impacting the photocatalytic behavior. In particular, we focused on the structural elucidation of reaction intermediates, and we aimed to determine research gaps in the utilization of visible light-activated TiO2 for water treatment. Future research directions, including the ecotoxicological effect of the photocatalytic degradation intermediates, the thermodynamical and kinetic mechanisms of the photocatalytic degradation process, and future applications of heterogeneous TiO2 photocatalysts, are also proposed. © 2019 Elsevier B.V.

语种： 英文

作者： Jin, Qi;Xie, Guangyu;Cai, Xiaoxi;Hu, Xinjiang*;Wang, Hui;...

期刊： RSC Advances,2020年10(11):6121-6128 ISSN：2046-2069

通讯作者： Zhao, Yunlin;Hu, Xinjiang

作者机构： [Zhao, Yunlin; Qiu, Guoqiang; Jin, Qi] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Peoples R China.;[Huo, Huiwen; Zhao, Yunlin; Hu, Xinjiang; Wang, Hui; Hu, XJ; Xie, Guangyu; Zhou, Daixi] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Cai, Xiaoxi] Hunan First Normal Univ, Coll Art & Design, Changsha 410205, Peoples R China.;[Wang, Weixuan] Northwest Normal Univ, Coll Geog & Environm Sci, Lanzhou 730070, Peoples R China.;[Tan, Xiaofei] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Peoples R China.

通讯机构： [Zhao, Yunlin; Hu, XJ; Zhao, YL] C;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Peoples R China.;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.

摘要： Photocatalysts comprising Broussonetia papyrifera biochar and g-C3N4 loaded on sodium alginate were prepared and characterized in terms of reusability and photocatalytic Cr(vi) reduction performance. The observed photocurrent responses as well as photoluminescence and UV-visible diffuse reflectance spectra showed that the best-performing catalyst featured the benefits of efficient photogenerated charge separation, superior electron conductance/transfer, and excellent light adsorption ability, which resulted in a higher photocatalytic Cr(vi) reduction performance compared to that of pure g-C3N4 powder. The prepared composite was shown to be reusable and well separable from the reaction mixture, thus being a promising material for the practical photocatalytic removal of Cr(vi) from wastewater. The trapping experiment and XPS spectra of catalysts after reactions confirm that the decontamination of Cr(vi) lies in the photocatalytic reduction of this species into low-toxicity Cr(iii) by photoinduced electrons generated from g-C3N4, followed by the adsorption of Cr(iii) on biochar or alginate with large specific areas. This journal is © The Royal Society of Chemistry.

语种： 英文

作者： Zhang, Peng;Tan, Xiaofei*;Liu, Shaobo*;Liu, Yunguo;Zeng, Guangming;...

期刊： Chemical Engineering Journal,2019年378:122141 ISSN：1385-8947

通讯作者： Tan, Xiaofei;Liu, Shaobo

作者机构： [Yin, Zhihong; Zhang, Peng; Liu, Yunguo; Zeng, Guangming; Tan, Xiaofei; Tan, XF; Liu, Shaobo; Ye, Shujing; Liu, Ni] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Yin, Zhihong; Zhang, Peng; Liu, Yunguo; Zeng, Guangming; Tan, Xiaofei; Ye, Shujing; Liu, Ni] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.;[Liu, Shaobo] Cent South Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.;[Liu, Shaobo] Cent South Univ, Sch Architecture & Art, Changsha 410083, Hunan, Peoples R China.;[Hu, Xinjiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha, Hunan, Peoples R China.

通讯机构： [Tan, XF; Liu, SB] H;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.

关键词： Advanced oxidation processes;Degradation;Estrogen;Iron-doped graphitic biochar;Persulfate;Water treatment

摘要： Advanced oxidation processes (AOPs) based on sulfate radicals (SO4∙-) is being actively investigated as an effective technology for aqueous organic pollutants degradation. In this work, a novel iron-doped graphitic biochar (Fe@GBC), which was synthesized by one-step method using biomass-derived biochar as precursor and potassium ferrate (K2FeO4) as activator, was applied to activate persulfate (PS) for the degradation of 17β-estradiol (E2). The characterizations indicated that Fe@GBC was successfully doped with iron particles and possessed a porous graphitic carbon structure. In order to evaluate the applicability of Fe@GBC, the effects of various reaction parameters, such as initial pH, catalyst dosage, PS concentration, as well as the reusability and stability of Fe@GBC were systematically investigated. With the synergistic effect of doped iron particles and porous graphitic carbon structure, Fe@GBC exhibited a high activity for PS activation and great degradation capacity to E2 (almost 100% degradation efficiency within 90 min). Through radical quenching experiments and electron spin resonance (ESR) analysis, it found that both SO4∙- and OH∙ were responsible for the degradation of E2, while SO4∙- played a dominant role. Moreover, Fe@GBC/PS also exhibited good degradation performance in complex water matrices. Overall, the facile one-step synthetic strategy and superior performance make Fe@GBC an alternative catalyst for persulfate activation and aqueous pollutants degradation. © 2019 Elsevier B.V.

语种： 英文

作者： Huo, Huiwen;Hu, Xinjiang*;Wang, Hui;Li, Jiang;Xie, Guangyu;...

期刊： International Journal of Environmental Research and Public Health,2019年16(17):3219- ISSN：1661-7827

通讯作者： Hu, Xinjiang

作者机构： [Huo, Huiwen; Hu, Xinjiang; Li, Chuang; Wang, Hui; Jin, Qi; Xie, Guangyu; Zhou, Daixi] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Wang, Hui; Qiu, Guoqiang] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Li, Jiang] Cent S Univ, Sch Architecture & Art, Changsha 410082, Hunan, Peoples R China.;[Liu, Yunguo; Tan, Xiaofei] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Liu, Yunguo; Tan, Xiaofei] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Hu, Xinjiang] C;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.

关键词： bismuth ferrite;carbon nanotube;chromium;graphite phase carbon nitride;inorganic compound;methylene blue;nanocomposite;unclassified drug;bismuth;carbon nanotube;chromium;chromium hexavalent ion;ferric ion;graphite;graphitic carbon nitride;methylene blue;nanocomposite;nitrogen derivative;adsorption;catalysis;chromium;experimental study;nanotube;pollutant removal;wastewater treatment;adsorption;Article;concentration (parameter);electron;molecular interaction;pH;photocatalysis;reaction time;reduction (chemistry);solution and solubility;time factor;waste component removal;waste water;water pollutant;adsorption;catalysis;chemistry;procedures;radiation response;sewage;ultraviolet radiation;Adsorption;Bismuth;Catalysis;Chromium;Ferric Compounds;Graphite;Methylene Blue;Nanocomposites;Nanotubes, Carbon;Nitrogen Compounds;Ultraviolet Rays;Waste Disposal, Fluid;Waste Water;Water Pollutants, Chemical

摘要： A novel graphite-phase carbon nitride (g-C3N4)/bismuth ferrite (BiFeO3)/carbon nanotubes (CNTs) ternary magnetic composite (CNBT) was prepared by a hydrothermal synthesis. Using this material, Cr(VI) and methylene blue (MB) were removed from wastewater through synergistic adsorption and photocatalysis. The effects of pH, time, and pollutant concentration on the photocatalytic performance of CNBT, as well as possible interactions between Cr(VI) and MB species were analyzed. The obtained results showed that CNTs could effectively reduce the recombination rate of electron-hole pairs during the photocatalytic reaction of the g-C3N4/BiFeO3 composite, thereby improving its photocatalytic performance, while the presence of MB increased the reduction rate of Cr(VI). After 5 h of the simultaneous adsorption and photocatalysis by CNBT, the removal rates of Cr(VI) and MB were 93% and 98%, respectively. This study provides a new theoretical basis and technical guidance for the combined application of photocatalysis and adsorption in the treatment of wastewaters containing mixed pollutants.

语种： 英文

作者： Hu, Xinjiang;Wang, Weixuan;Xie, Guangyu;Wang, Hui*;Tan, Xiaofei;...

期刊： Chemosphere,2019年216(Feb.):733-741 ISSN：0045-6535

通讯作者： Wang, Hui;Zhao, Yunlin

作者机构： [Hu, Xinjiang; Zhao, Yunlin; Wang, Hui; Wang, Weixuan; Jin, Qi; Xie, Guangyu; Zhou, Daixi] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Hu, Xinjiang; Zhao, Yunlin; Wang, Hui] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Wang, Hui] Chinese Acad Agr Sci, Inst Bast Fiber Crops, Changsha 410205, Hunan, Peoples R China.;[Tan, Xiaofei] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Tan, Xiaofei] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Wang, Hui; Zhao, Yunlin] C;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.

关键词： g-C3N4 nanosheets;BiFeO3;Cr(VI) photoreduction;Heterojunction;Electrolyte ion

摘要： A novel ternary composite of graphitic carbon nitride (g-C3N4)/graphene oxide (GO) sheets/BiFeO3 (CNGB) with highly enhanced visible-light photocatalytic activity toward Cr(Vl) photoreduction is prepared and characterized. The characterization and photocatalysis experiments corroborate its reasonable band gap, efficient charge separation and transfer, widened visible-light adsorption, easy solid-liquid separation, good stability and superior catalytic activity of CNGB. Three CNGB samples with different ratios of g-C3N4 and BiFeO3 (CNGB-1, -2, -3 with 2:4, 3:3, and 4:2, respectively), though possessing different adsorption ability, eventually remove all Cr(Vl) ions via photocatalysis within 90 min. The catalytic efficiency of the composite is the highest at pH 2; increases in pH decrease the catalytic ability. The inorganic anions such as SO4-, Cl-, and NO3- only slightly affects the photocatalytic process. The matching of the band structure between BiFeO3 and g-C3N4 generates efficient photogenerated electron migration from the conduction band of g-C3N4 to that of BiFeO3, which is also facilitated by the electron bridging and collecting effects of GO, and holes transfer from the valence band of BiFeO3 to that of g-C3N4, yielding the efficient separation of photogenerated electron-hole pairs and the subsequent enhancement of photocatalytic activity. The research provides a theoretical basis and technical support for the development of photocatalytic technologies for effective application in wastewater treatment and Cr-contaminated water restoration. (C) 2018 Elsevier Ltd. All rights reserved.

语种： 英文

作者： 方威;赵运林;胡新将;王晓雪

期刊： 中国资源综合利用,2019年37(6):186-193 ISSN：1008-9500

作者机构： 中南林业科技大学环境科学与工程学院水污染控制实验室;中南林业科技大学生命科学与技术学院,长沙,410004;[王晓雪; 方威; 胡新将; 赵运林] 中南林业科技大学

关键词： 改性;光催化;应用

摘要： 石墨型氮化碳（g-C3N4）聚合物是一种新型的半导体非金属光催化剂,以三聚氰胺、尿素、双氰胺等富氮低成本材料为前驱体就可以制备。在拥有良好的化学稳定性和热稳定性的同时,其既能吸收太阳光转化为化学能,又能彻底氧化还原环境中的污染物质,而被广泛应用于光催化领域,如光降解有机污染物、光解水产氨产氧和有机选择性光合成等,在能源短缺和环境保护方面具有很广阔的研究空间。本文主要论述了g-C3N4在光催化领域的发展、光催化性能的改良方法以及其在光电领域的应用,并提出g-C3N4在未来研究中所面临的挑战。

语种： 中文

作者： Cai, Xiaoxi;Li, Jiang*;Liu, Yunguo;Hu, Xinjiang;Tan, Xiaofei;...

期刊： International Journal of Environmental Research and Public Health,2019年17(1):6 ISSN：1661-7827

通讯作者： Li, Jiang

作者机构： [Cai, Xiaoxi] Hunan First Normal Univ, Coll Art & Design, Changsha 410205, Peoples R China.;[Liu, Shaobo; Li, Jiang] Cent S Univ, Sch Architecture & Art, Changsha 410083, Peoples R China.;[Liu, Yunguo; Tan, Xiaofei] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Peoples R China.;[Hu, Xinjiang; Wang, Hui; Luo, Lerong] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Gu, Yanling] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.

通讯机构： [Li, Jiang] C;Cent S Univ, Sch Architecture & Art, Changsha 410083, Peoples R China.

关键词： acetic acid;biochar;bismuth derivative;bismuth ferrite;carbon;chitosan;ferrite;methylene blue;unclassified drug;biochar;bismuth;charcoal;chitosan;ferric ion;ferrite;methylene blue;adsorption;biochar;bismuth;chitin;composite;design;dye;ferrite;adsorption;alkalinity;Article;chemical binding;chemical interaction;concentration (parameter);dissolution;isotherm;kinetics;magnetism;pH;physical chemistry;reaction time;synthesis;temperature sensitivity;waste component removal;chemistry;magnetism;procedures;sewage;water pollutant;Hibiscus cannabinus;Adsorption;Bismuth;Charcoal;Chitosan;Ferric Compounds;Magnetic Phenomena;Methylene Blue;Waste Disposal, Fluid;Water Pollutants, Chemical

摘要： Biochar obtained by pyrolysis of the fiber plant kenaf was mixed with bismuth ferrite (BiFeO3) in a chitosan-containing acetic acid solution, magnetized, and modified to prepare a chitosan-crosslinked BiFeO3/biochar coupled magnetic material. The adsorption properties of the composite were investigated using methylene blue dissolved in water, and the effects of external conditions, such as pH, methylene blue concentration, reaction time, and temperature, on the adsorption performance were studied. The adsorption data were fitted and analyzed with kinetic and isotherm models, and the results showed that the BiFeO3/biochar coupled magnetic material effectively adsorbed methylene blue. The amounts adsorbed onto this magnetic material increased with increasing initial methylene blue concentration, reaction time, and temperature, and the adsorption performance improved under neutral and alkaline conditions. The pseudo-first-order kinetic and Langmuir isotherm models satisfactorily fitted the adsorption data, showing that the adsorption of methylene blue involved both chemical and physical adsorption. The maximum adsorption capacity of methylene blue onto the BiFeO3/biochar coupled magnetic material reached 18.942 mg·g−1 at 25 °C, confirming the excellent dye binding activity of this material. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

语种： 英文

作者： Liu, Shaobo;Li, Meifang*;Liu, Yunguo*;Liu, Ni;Tan, Xiaofei;...

期刊： Journal of the Taiwan Institute of Chemical Engineers,2019年102:330-339 ISSN：1876-1070

通讯作者： Li, Meifang;Liu, Yunguo

作者机构： [Liu, Shaobo] Cent S Univ, Sch Architecture & Art, Lushan South Rd, Changsha 410083, Hunan, Peoples R China.;[Liu, Shaobo] Cent S Univ, Sch Met & Environm, Lushan South Rd, Changsha 410083, Hunan, Peoples R China.;[Yin, Zhihong; Liu, Yunguo; Tan, Xiaofei; Li, Meifang; Liu, Ni] Hunan Univ, Coll Environm Sci & Engn, Lushan South Rd, Changsha 410082, Hunan, Peoples R China.;[Yin, Zhihong; Liu, Yunguo; Tan, Xiaofei; Li, Meifang; Liu, Ni] Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Lushan South Rd, Changsha 410082, Hunan, Peoples R China.;[Jiang, Luhua] Cent S Univ, Sch Minerals Proc & Bioengn, Lushan South Rd, Changsha 410083, Hunan, Peoples R China.

通讯机构： [Li, MF; Liu, YG] H;Hunan Univ, Coll Environm Sci & Engn, Lushan South Rd, Changsha 410082, Hunan, Peoples R China.;Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Lushan South Rd, Changsha 410082, Hunan, Peoples R China.

关键词： Bond strength (chemical);Carbonization;Chemical activation;Graphene;Graphene oxide;Hydrogen bonds;Ionic strength;Magnetite;Magnetite nanoparticles;Mechanisms;Nanomagnetics;Organic acids;Thermoanalysis;Water pollution;Adsorption capacities;Bio chars;Carbonization methods;Initial concentration;Oxygen-containing functional groups;Pseudo second order kinetics;Thermo dynamic analysis;Zeta potential measurements;Adsorption

摘要： A novel graphene oxide supported activated magnetic biochar (GO-AMBC) is fabricated for 17 beta-estradiol (E2) removal from aqueous solution by grafting graphene oxide (GO) and magnetite nanoparticles onto the activated biochar surface with a one-step activation, magnetization, and carbonization method. GO-AMBC is characterized using SEM, TEM, FTIR, VSM, XRD, XPS, BET surface area and zeta potential measurements. The characterization results show that GO-AMBC possesses a larger surface area and more oxygen-containing functional groups than the unmodified biochar. When the E2 initial concentration is 6 mg/L, its adsorption capacity by GO-AMBC (46.22 mg/g) is more than two times higher than that of pristine biochar (23.09 mg/g) at 298 K and pH = 7.0. Adsorption results show that E2 uptake follows by pseudo-second-order kinetic and Freundlich isothermal models. Thermodynamic analysis indicates that the adsorption process is spontaneous and exothermic. E2 removal by GO-AMBC is significantly affected by the actual water conditions, including solution pH, ionic strength, and organic acids. Among them, organic acids have obvious inhibition effect on E2 removal, and the inhibition effect by oxalate is stronger than that of benzoate. The adsorption mechanism of E2 on GO-AMBC is mainly controlled by hydrogen bonds, electrostatic and pi-pi interactions. The experimental results of this study and comparative analysis with other adsorbents suggest that GO-AMBC is an economical, efficient and recyclable adsorbent and has great potential for E2 removal from contaminated water. (C) 2019 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

语种： 英文

作者： Qiu, Guoqiang;Zhao, Yunlin*;Wang, Hui;Tan, Xiaofei;Chen, Fangxu;...

期刊： Environmental Science and Pollution Research,2019年26(7):6565-6575 ISSN：0944-1344

通讯作者： Zhao, Yunlin;Hu, Xinjiang

作者机构： [Zhao, Yunlin; Hu, Xinjiang; Qiu, Guoqiang; Zhao, YL] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Chen, Fangxu; Zhao, Yunlin; Hu, Xinjiang; Wang, Hui; Zhao, YL] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Wang, Hui] Chinese Acad Agr Sci, Inst Bast Fiber Crops, Changsha 410205, Hunan, Peoples R China.;[Tan, Xiaofei] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Tan, Xiaofei] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Zhao, YL; Hu, XJ] C;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.

关键词： Biochar;Phosphate adsorption;Eutrophication;Recycling;Restored manganese mine land

摘要： In this study, Broussonetia papyrifera leaves collected from land near a restored manganese mine in the Hunan Province of China were converted into biochar under high-temperature anaerobic conditions, regeneration and utilization of agricultural and forest waste, and applied to the prevention of eutrophication. The physicochemical properties of the B. papyrifera biochar were characterized using Micromeritics 3Flex analyzer, scanning electron microscope (SEM), Fourier transform infrared spectrometer (FT-IR), thermogravimetric analyzer (TGA), X-ray photoelectron spectrometer (XPS), zeta potential meter (zeta), and X-ray diffraction (XRD). The effects of pH, ionic strength, coexisting ions, time, initial concentration, and temperature on the decontamination process of phosphate in water were studied. The results indicated that adsorption was enhanced under alkaline conditions. The pseudo-second-order model of adsorption kinetics was applied to illustrate the adsorption processes. The chemical adsorption reaction was the main rate-limiting step in the adsorption process. Isotherm experimental data were best fitted by the Freundlich model at 25°C and by the Langmuir model at 35°C. The phosphate combined with B. papyrifera biochar mainly in the forms of exchangeable phosphorus (Ex-P), Al-bound phosphorus (Al-P), and Fe-bound phosphorus (Fe-P). These results indicate that B. papyrifera biochar is a suitable candidate for the treatment of a eutrophic body of water. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.

语种： 英文

作者： Wang, Xiaohua;Gu, Yanling*;Tan, Xiaofei*;Liu, Yunguo;Zhou, Yahui;...

期刊： Environmental Toxicology and Chemistry,2019年38(10):2337-2347 ISSN：0730-7268

通讯作者： Gu, Yanling;Tan, Xiaofei

作者机构： [Gu, Yanling; Liu, Yunguo; Wang, Xiaohua; Tan, Xiaofei; Cai, XiaoXi; Zhang, Chen; Gu, YL; Tan, XF; Xu, Weihua; Zhou, Yahui] Hunan Univ, Coll Environm Sci & Engn, Changsha, Hunan, Peoples R China.;[Gu, Yanling; Liu, Yunguo; Wang, Xiaohua; Tan, Xiaofei; Cai, XiaoXi; Zhang, Chen; Gu, YL; Tan, XF; Xu, Weihua; Zhou, Yahui] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha, Hunan, Peoples R China.;[Wang, Xiaohua] Hunan City Univ, Coll Architecture & Urban Planning, Yiyang, Peoples R China.;[Hu, Xinjiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha, Hunan, Peoples R China.;[Cai, XiaoXi] Hunan First Normal Univ, Coll Art & Design, Changsha, Hunan, Peoples R China.

通讯机构： [Gu, YL; Tan, XF] H;Hunan Univ, Coll Environm Sci & Engn, Changsha, Hunan, Peoples R China.;Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha, Hunan, Peoples R China.

关键词： Bioavailability;Heavy metals;Sediment toxicity;Sediment chemistry;Environmental chemistry

摘要： Biochar has frequently been used for the treatment of heavy metal pollution in water and soil; its effect on contaminated sediments requires further research. To improve the ability of biochar to immobilize heavy metals in sediment, we prepared a functionalized biochar/attapulgite composite by pyrolysis of the clay attapulgite and zinc chloride–pretreated rice straw biomass. Compared with the original biochar, the biochar/attapulgite composite had a large increase in specific surface area, pore volume, oxygen-containing functional groups, and cation exchange capacity. Biochar effectively improved the dispersibility of attapulgite as a matrix. The results showed that the biochar/attapulgite composite effectively reduced the bioavailable fraction of arsenic (As) and cadmium (Cd) in river sediment, which was a great improvement compared with the raw biochar. After the sediment was treated with different biochar/attapulgite composites, the concentrations of As and Cd in the overlying water and the porewater, and the content of acid-extractable and toxicity characteristic leaching procedure (TCLP)-extractable As and Cd in the solid phase of the sediment decreased significantly. Both zinc chloride activation and attapulgite improved As and Cd immobilization in sediment when we used the biochar/attapulgite composite. The results suggest that biochar/attapulgite composite can be used as an efficient in situ sorbent amendment to improve the heavy metal immobilization ability of the sediment. Environ Toxicol Chem 2019;38:2337–2347. © 2019 SETAC. © 2019 SETAC

语种： 英文

作者： Tang, Chunfang*;Zhang, Riqing;Hu, Xinjiang;Song, Jinfeng;Li, Bing;...

期刊： International Journal of Phytoremediation,2019年21(4):305-315 ISSN：1522-6514

通讯作者： Tang, Chunfang;Hu, Xi;Zhao, Yunlin

作者机构： [Hu, Xi; Tang, Chunfang; Hu, Xinjiang; Ou, Danling; Tang, CF; Hu, X; Song, Jinfeng; Li, Bing] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Zhang, Riqing] Cent South Univ Forestry & Technol, Coll Forestry, Changsha, Hunan, Peoples R China.;[Hu, Xinjiang; Zhao, Yunlin] Cent South Univ Forestry & Technol, Coll Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Tang, CF; Hu, X; Zhao, Yunlin] C;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Coll Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.

关键词： antioxidant;cadmium;hydrogen peroxide;malonaldehyde;spermidine;superoxide dismutase;bioremediation;drug effect;oxidative stress;plant leaf;plant root;willow;Antioxidants;Biodegradation, Environmental;Cadmium;Hydrogen Peroxide;Malondialdehyde;Oxidative Stress;Plant Leaves;Plant Roots;Salix;Spermidine;Superoxide Dismutase

摘要： In this study, exogenous spermidine role on Salix matsudana tolerance to cadmium was evaluated. Spermidine and cadmium presented antagonistic effects on the biomass, copper and zinc concentrations in S. matsudana. cadmium mainly distributed in the cell wall of subcellular fraction; 46.97%–60.43% of cadmium existed in a sodium chloride-extracted form. Cadmium contents in roots, leaves, and twigs ranged from 2002.67 to 3961.00, 111.59 to 229.72, and 102.56 to 221.27 mg/kg, respectively. Spermidine application elevated cadmium concentrations in the roots, cuttings, and cell wall and the ratio of deionized water-extracted cadmium, but decreased cadmium levels in the twigs and leaves and the fractions of cadmium extracted by ethanol and sodium chloride, respectively. Putrescine and malondialdehyde were important indicators of cadmium-induced oxidative damage. Exogenous spermidine alleviated the accumulation of superoxide anion, hydrogen peroxide, malondialdehyde via promoting the levels of spermidine, soluble protein, superoxide dismutase, reductive ascorbate, glutathione reductase, and glutathione peroxidase in S. matsudana leaves under the corresponding cadmium stress. The results indicated that S. matsudana was a candidate for cadmium rhizoremediation and extraction in leaves; the spermidine application enhanced the cadmium tolerance of S. matsudana through promoting cadmium accumulation in roots, cell wall, and less bioactive chemical forms and the antioxidative ability. © 2018, © 2018 Taylor & Francis Group, LLC.

语种： 英文

作者： Shu, Yan;Tang, Chunfang*;Hu, Xinjiang;Jiang, Luhua;Hu, Xi;...

期刊： Water,2018年10(6):754-754 ISSN：2073-4441

通讯作者： Tang, Chunfang;Zhao, Yunlin

作者机构： [Hu, Xi; Tang, Chunfang; Hu, Xinjiang; Shu, Yan] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Hu, Xinjiang; Zhao, Yunlin] Cent South Univ Forestry & Technol, Coll Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Jiang, Luhua] Hunan Univ, Coll Environm Sci & Engn, Changsha 410084, Hunan, Peoples R China.

通讯机构： [Tang, Chunfang; Zhao, Yunlin] C;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Coll Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.

关键词： Biochar;Cr(VI);Process optimization;Removal mechanism;Typha angustifolia

摘要： In this study, Box-Behnken design (BBD) was employed to optimize the process for H<inf>3</inf>PO<inf>4</inf>-activated Typha angustifolia activated carbon (TAC) production and Cr removal by TAC;the removal mechanisms were discussed based on TAC characterization, and the regeneration evaluation was also conducted. The optimum preparation conditions were activated time of 1.5 h, temperature of 469.02 &deg;C, and incubation ratio of 4, resulting in an experimental carbon yield of 38.23% and Cr removal of 90.01%. The optimum adsorption parameters were found to be 0.02 g/50 mL TAC, 80 mg/L Cr(VI), and 2.21 pH with the observed Cr adsorption capacity of 59.54 mg/g. The removal mechanisms involved coulombic attraction, ionic exchange, surface complexation, and reduction. The process of Cr(VI) adsorption was feasible, spontaneous, and endothermic in nature, and the pseudo-second-order and Langmuir isotherm models were more appropriate for the removal process. After five adsorption/desorption cycles, the Cr adsorption capacity on TAC reduced by only 24.37%. The results showed that BBD could successfully optimize TAC production and Cr removal, and TAC could be developed as a promising, eco-friendly, and effective adsorbent for Cr pollution control.<br/> &copy;2018 by the authors.

语种： 英文

作者： Cai, Xiaoxi;Li, Jiang*;Liu, Yunguo*;Yan, Zhili;Tan, Xiaofei;...

期刊： JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY,2018年93(3):783-791 ISSN：0268-2575

通讯作者： Li, Jiang;Liu, Yunguo

作者机构： [Li, Jiang; Liu, Yunguo; Zeng, Guangming; Gu, Yanling; Jiang, Luhua; Tan, Xiaofei; Cai, Xiaoxi; Yan, Zhili] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Liu, Yunguo; Zeng, Guangming; Gu, Yanling; Jiang, Luhua; Tan, Xiaofei; Cai, Xiaoxi; Yan, Zhili; Li, Jiang] Hunan Univ, Key Lab Environm Biol & Pollut Control, Changsha, Hunan, Peoples R China.;[Cai, Xiaoxi] Hunan First Normal Univ, Coll Art & Design, Changsha, Hunan, Peoples R China.;[Liu, Shaobo] Cent S Univ, Sch Architecture & Art, Changsha, Hunan, Peoples R China.;[Liu, Shaobo] Cent S Univ, Sch Met & Environm, Changsha, Hunan, Peoples R China.

通讯机构： [Li, J; Liu, YG] H;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.

关键词： Adsorption;Biomass;Characterization;Chemical industry;Coated materials;Complexation;Composite materials;Degradation;Organic pollutants;Oxides;Photocatalysis;Sols;Solutions;Titanium;Titanium compounds;Adsorption performance;Aqueous organic pollutants;Bio chars;Effect of adsorptions;High specific surface area;Photo catalytic degradation;Photo-catalytic;Photocatalytic activities;Titanium dioxide;biochar;charcoal;dye;nanocomposite;safranine T;titanium dioxide;unclassified drug;adsorption;aqueous solution;Article;biomass;chemical composition;concentration (parameters);controlled study;infrared spectroscopy;material coating;molecular stability;organic pollution;pH;photocatalysis;photodegradation;pyrolysis;recycling;scanning electron microscopy;surface area;surface property;synthesis;time;ultraviolet irradiation;waste component removal;X ray diffraction;X ray photoelectron spectroscopy

摘要： BACKGROUND: This article reports the synthesis and characterisation of titanium dioxide-coated biochar composites (TBCs) by pyrolysing titanium dioxide-treated biomass prepared by a modified sol–gel method. Their adsorptive and photocatalytic activities were evaluated based on the removal of safranine T (ST) from an aqueous solution with/without UV-light irradiation. RESULTS: Characterisation studies suggested that TiO2 was successfully loaded on the biochar substrate. The biochar and TiO2 contents of the composite significantly affected its performance. The ST removal capabilities of the TBCs with 1, 1.5, 2, and 2.5 g of the biomass are 1.7, 2.3, 7.2, and 2.3 times better than that of the raw biochar, respectively. Thus, the optimum amount of biomass in TBC-x was determined to be 2 g, with the corresponding sample exhibiting excellent stability, effectiveness over a wide pH range, and a maximum ST removal capacity of 226.7 mg g-1. CONCLUSION: The loading of TiO2 significantly enhanced the adsorption performance of biochar and the high specific surface area of the biochar synergistically promoted the photocatalytic activity of TiO2. Both adsorption and photocatalytic degradation were confirmed to contribute to the decolourisation of the aqueous solution because of the removal of ST, with the effect of adsorption being slightly higher than that of photocatalysis. The synthesised composite is a promising alternative material for removing chemical contaminants. © 2017 Society of Chemical Industry. © 2017 Society of Chemical Industry

语种： 英文

作者： Li, Mei-fang;Liu, Yun-guo*;Liu, Shao-bo;Zeng, Guang-ming;Hu, Xin-jiang;...

期刊： Journal of Colloid and Interface Science,2018年521:150-159 ISSN：0021-9797

通讯作者： Liu, Yun-guo

作者机构： [Jiang, Lu-hua; Liu, Yun-guo; Tan, Xiao-fei; Liu, Ni; Zeng, Guang-ming; Li, Mei-fang] Hunan Univ, Coll Environm Sci & Engn, Lushan South Rd, Changsha 410082, Hunan, Peoples R China.;[Jiang, Lu-hua; Liu, Yun-guo; Tan, Xiao-fei; Liu, Ni; Zeng, Guang-ming; Li, Mei-fang] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Lushan South Rd, Changsha 410082, Hunan, Peoples R China.;[Liu, Shao-bo] Cent S Univ, Sch Met & Environm, Lushan South Rd, Changsha 410083, Hunan, Peoples R China.;[Hu, Xin-jiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Shaoshan South Rd, Changsha 410004, Hunan, Peoples R China.;[Wen, Jun] Guangxi Univ, Coll Agr, Univ Rd, Nanning 530005, Peoples R China.

通讯机构： [Liu, Yun-guo] H;Hunan Univ, Coll Environm Sci & Engn, Lushan South Rd, Changsha 410082, Hunan, Peoples R China.

关键词： Adsorption;Antibiotics;Bins;Bond strength (chemical);Dyes;Electron microscopy;Fourier transform infrared spectroscopy;Graphene;Graphene oxide;High resolution transmission electron microscopy;Hydrogen bonds;Ionic strength;Magnetism;Reusability;Scanning electron microscopy;Systems (metallurgical);Transmission electron microscopy;X ray diffraction;Adsorption mechanism;Ciprofloxacin;Diethylenetriamine penta-acetic acids;Experimental conditions;Freundlich isotherm model;Regeneration performance;Tetracycline;Zeta potential measurements;X ray photoelectron spectroscopy;ciprofloxacin;graphene oxide;magnetic nanoparticle;pentetic acid;tetracycline;adsorption kinetics;amidation;Article;drug adsorption;drug elimination;hydrogen bond;infrared spectroscopy;ionic strength;pH;priority journal;scanning electron microscopy;static electricity;temperature;transmission electron microscopy;X ray diffraction;X ray photoelectron spectroscopy;zeta potential

摘要： Adsorption of tetracycline (TC) and ciprofloxacin (CIP) in single and binary systems by diethylenetriaminepentaacetic acid-functionalized magnetic graphene oxide (DDMGO) was explored. DDMGO were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and zeta potential measurements. The adsorption kinetics and equilibrium data of single antibiotic were well fitted by pseudo-second-order and Freundlich isotherm models, respectively. Negative ΔGo values hinted the spontaneous nature of TC and CIP sorption. Moreover, the ΔHo was positive for TC removal and negative for CIP removal, indicating that TC adsorption was endothermic and CIP adsorption was exothermic. Various experimental conditions (pH, ionic strength and foreign ions) presented an important influence on TC and CIP removal. In binary systems, TC sorption onto DDMGO exhibited stronger inhibition effect by the coexisting competitive antibiotics than that for CIP. The reusability experiment revealed that the DDMGO had an excellent regeneration performance in single and binary systems. TC and CIP removal mechanism on DDMGO was mainly dependent on π-π interaction, hydrogen bonds and amidation reaction. Besides, TC and CIP uptake could also be explained by cation-π and electrostatic interaction, respectively. These findings showed that DDMGO was an efficient and reusable adsorbent for antibiotics elimination. © 2018 Elsevier Inc.

语种： 英文

作者： Wang, Hui;Hu, Xinjiang;Guo, Yuan;Qiu, Caisheng;Long, Songhua;...

期刊： JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY,2018年93(8):2447-2455 ISSN：0268-2575

通讯作者： Wang, Yufu;Liu, Yunguo

作者机构： [Guo, Yuan; Wang, Hui; Xu, Wenwen; Long, Songhua; Wang, Yufu; Hao, Dongmei; Qiu, Caisheng] Chinese Acad Agr Sci, Inst Bast Fiber Crops, Changsha 410205, Hunan, Peoples R China.;[Guo, Yuan; Wang, Hui; Xu, Wenwen; Long, Songhua; Wang, Yufu; Hao, Dongmei; Qiu, Caisheng] Chinese Acad Agr Sci, Ctr Southern Econ Crops, Changsha 410205, Hunan, Peoples R China.;[Hu, Xinjiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha, Hunan, Peoples R China.;[Cai, Xiaoxi] Hunan First Normal Univ, Coll Art & Design, Changsha, Hunan, Peoples R China.;[Liu, Yunguo; Cai, Xiaoxi] Hunan Univ, Coll Environm Sci & Engn, Changsha, Hunan, Peoples R China.

通讯机构： [Wang, Yufu] C;[Liu, Yunguo] H;Chinese Acad Agr Sci, Inst Bast Fiber Crops, Changsha 410205, Hunan, Peoples R China.;Chinese Acad Agr Sci, Ctr Southern Econ Crops, Changsha 410205, Hunan, Peoples R China.;Hunan Univ, Coll Environm Sci & Engn, Changsha, Hunan, Peoples R China.

关键词： Alkalinity;Copper compounds;Graphene;Graphene oxide;Metal ions;Pollution;Sodium chloride;Solutions;Alternative materials;Characterization techniques;Copper ions;External influences;Graphene oxide nanosheets;Increasing solutions;Oxygen-containing functional groups;Pollutant removal;Adsorption;benzoic acid;copper ion;formic acid;functional group;graphene oxide;nanosheet;oxygen;sodium chloride;adsorption;aqueous solution;Article;crystal structure;heavy metal removal;ionic strength;pH;zeta potential

摘要： BACKGROUD: In this work, graphene oxide (GO) was synthesized followed by a modified Hummers method and several characterization techniques were provided. Its adsorptive activity was evaluated based on the removal of Cu(II) from an aqueous solution. External influences were taken into account to further study the adsorption mechanism. RESULT: Characterization results revealed that GO was well prepared and a large amount of oxygen-containing functional groups were introduced. The Cu(II) adsorption increased with increasing solution pH and precipitate at alkaline conditions. NaCl concentration improved copper adsorption at low pH. Formate reduced copper adsorption while benzoate improved the adsorption under low pH conditions. CONCLUSIONS: Here, GO performed Cu(II) adsorption well. The external conditions have different influences on the adsorption process. Experimental results demonstrate that GO is a promising alternative material for pollutants removal. © 2018 Society of Chemical Industry. © 2018 Society of Chemical Industry

语种： 英文

作者： Zhang, Xiaoxiao;Shao, Jihai;Chen, Anwei*;Shang, Cui;Hu, Xinjiang;...

期刊： Ecotoxicology and Environmental Safety,2018年157:95-101 ISSN：0147-6513

通讯作者： Chen, Anwei

作者机构： [Luo, Si; Peng, Liang; Shang, Cui; Zhang, Xiaoxiao; Shao, Jihai; Zeng, Qingru; Chen, Anwei; Lei, Ming] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Hu, Xinjiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Chen, Anwei] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.

关键词： Cadmium;Calcium;Homeostasis;Phanerochaete chrysosporium;Stress

摘要： Due to the widespread application of white-rot fungi for the treatment of pollutants, it's crucial to exploit the special effects of pollutants on the microbes. Here, we studied the effects of cadmium on calcium homeostasis in the most studied white-rot fungus Phanerochaete chrysosporium. The response of P. chrysosporium to cadmium stress is concentration-dependent. A high concentration of cadmium caused the release of calcium from P. chrysosporium, while a hormesis effect was observed at a lower cadmium concentration (10 μM), which resulted in a significant increase in calcium uptake and reversed the decrease in cell viability. Calcium (50 μM) promoted cell viability (127.2% of control), which reflects that calcium can protect P. chrysosporium from environmental stress. Real-time changes in the Ca2+ and Cd2+ fluxes of P. chrysosporium were quantified using the noninvasive microtest technique. Ca2+ influx decreased significantly under cadmium exposure, and the Ca2+ channel was involved in Ca2+ and Cd2+ influx. The cadmium and/or calcium uptake results coupled with the real-time Ca2+ and Cd2+ influxes microscale signatures can enhance our knowledge of the homeostasis of P. chrysosporium with respect to cadmium stress, which may provide useful information for improving the bioremediation process. © 2018 Elsevier Inc.

语种： 英文

作者： Hu, Xinjiang*;Zhao, Yunlin*;Wang, Hui;Cai, Xiaoxi;Hu, Xi;...

期刊： JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY,2018年93(8):2226-2233 ISSN：0268-2575

通讯作者： Hu, Xinjiang;Zhao, Yunlin

作者机构： [Hu, Xi; Tang, Chunfang; Hu, Xinjiang; Zhao, Yunlin; Zhao, YL] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Hu, Xinjiang; Zhao, Yunlin] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha, Hunan, Peoples R China.;[Wang, Hui] Chinese Acad Agr Sci, Inst Bast Fiber Crops, Changsha, Hunan, Peoples R China.;[Yang, Yuanxiu] South China Agr Univ, Coll Nat Resources & Environm, Guangzhou, Guangdong, Peoples R China.;[Liu, Yunguo; Cai, Xiaoxi] Hunan Univ, Coll Environm Sci & Engn, Changsha, Hunan, Peoples R China.

通讯机构： [Hu, XJ; Zhao, YL] C;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.

关键词： Chemicals removal (water treatment);Decontamination;Gas adsorption;Graphene;Irradiation;Metal ions;pH effects;Titanium dioxide;Electron transfer pathways;Environmental conditions;Ferric ions;Formate;Hexavalent chromium;Inorganic anions;Nitrogen adsorption desorption isotherms;Wastewater characteristics;Chromium compounds;chromium;ferric ion;formic acid;graphene oxide;titanium dioxide;Article;comparative study;decontamination;field emission scanning electron microscopy;oxidation reduction reaction;pH;photocatalysis;surface area;synthesis;ultraviolet irradiation;ultraviolet radiation

摘要： <jats:title>Abstract</jats:title><jats:sec><jats:title>BACKGROUND</jats:title><jats:p>In this study, a graphene oxide@TiO<jats:sub>2</jats:sub> composite (GO/TiO<jats:sub>2</jats:sub>) was prepared and characterized by SEM, EDX, XRD, nitrogen adsorption–desorption isotherm, and XPS. Photocatalytic reduction and removal of Cr(VI) using this composite in an aerobic atmosphere were studied under UV irradiation. The effects of pH, ferric ions, inorganic anions, and formate were investigated systematically.</jats:p></jats:sec><jats:sec><jats:title>RESULTS</jats:title><jats:p>The Cr(VI) reduction rate decreased with increasing solution pH. The presence of ferric ions in the system improved the photocatalytic reduction process. The effects of SO<jats:sub>4</jats:sub><jats:sup>2−</jats:sup> and PO<jats:sub>4</jats:sub><jats:sup>3−</jats:sup> on the process were higher than those of Cl<jats:sup>−</jats:sup> and NO<jats:sub>3</jats:sub><jats:sup>−</jats:sup>. Formate slightly inhibited adsorption of Cr(VI), while it improved Cr(VI) reduction. GO/TiO<jats:sub>2</jats:sub> has good stability and it maintained full photoreduction activity for at least three cycles.</jats:p></jats:sec><jats:sec><jats:title>CONCLUSION</jats:title><jats:p>The results indicated that GO/TiO<jats:sub>2</jats:sub> can thermodynamically reduce Cr(VI) to Cr(III) under UV light. Environmental conditions and wastewater characteristics (e.g. pH, ferric ions, inorganic anions, and formate) can influence the decontamination process because they affect the interactions between chromium ions and GO/TiO<jats:sub>2</jats:sub> and alter the electron‐transfer pathways. The results suggest that the GO/TiO<jats:sub>2</jats:sub> is an attractive material for removing hexavalent chromium from water using a photocatalytic process. © 2018 Society of Chemical Industry</jats:p></jats:sec>

语种： 英文

作者： Jiang, Luhua;Liu, Yunguo*;Zeng, Guangming;Liu, Shaobo;Hu, Xinjiang;...

期刊： Chemical Engineering Journal,2018年339:296-302 ISSN：1385-8947

通讯作者： Liu, Yunguo

作者机构： [Jiang, Luhua; Liu, Yunguo; Zeng, Guangming; Tan, Xiaofei; Li, Meifang; Liu, Ni] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Jiang, Luhua; Liu, Yunguo; Zeng, Guangming; Tan, Xiaofei; Li, Meifang; Liu, Ni] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.;[Liu, Shaobo] Cent S Univ, Sch Met & Environm, Changsha 410083, Peoples R China.;[Hu, Xinjiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn Res, Changsha 410004, Hunan, Peoples R China.;[Zhou, Lu] Changsha Univ Sci & Technol, Sch Hydraul Engn, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Liu, Yunguo] H;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.

关键词： Estrogen contaminants;Graphene nanosheets;Natural organic matter;Reduction degree

摘要： In this research, adsorption of two estrogens, namely, 17&beta;-estradiol (E2) and 17&alpha;-ethynylestradiol (EE2), by graphene nanosheets with different reduction degrees (rGOs) were investigated;and the effects of solution chemistry, such as natural organic matter (NOM), pH and ionic strength (IS), on the E2 and EE2 adsorption behaviors were also examined. Results indicated that adsorption abilities of estrogens increased with increasing the reduction degree of rGOs;the &pi;&ndash;&pi;stacking interaction could be considered as a predominant interaction to the enhanced adsorption capacities of rGOs. Among the solution chemistry, NOM exhibited the significant influence on estrogens adsorption, which suggested that once released into water environments, graphene materials will adsorb estrogens but with a lower adsorption ability than that in ultrapure water due to the ubiquitous presence of NOM in aquatic environments. Besides, estrogens adsorption on rGOs was pH-dependent, but the influence of acid rain would be insignificant due to slight change in low pH range. However, IS within the typical range in natural waters did not exhibit significant influence on the uptake of estrogens by rGOs. Above findings of this work might have significant implications for the fate and transport of estrogens with graphene materials in the environment.<br/> &copy;2017

语种： 英文

作者： Li, Mei-fang;Liu, Yun-guo*;Zeng, Guang-ming;Liu, Shao-bo;Hu, Xin-jiang;...

期刊： Journal of Colloid and Interface Science,2017年485:269-279 ISSN：0021-9797

通讯作者： Liu, Yun-guo

作者机构： [Jiang, Lu-hua; Liu, Yun-guo; Cai, Xiao-xi; Tan, Xiao-fei; Zeng, Guang-ming; Li, Mei-fang; Yan, Zhi-li] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Jiang, Lu-hua; Liu, Yun-guo; Cai, Xiao-xi; Tan, Xiao-fei; Zeng, Guang-ming; Li, Mei-fang; Yan, Zhi-li] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.;[Liu, Shao-bo] Cent S Univ, Sch Met & Environm, Changsha 410083, Peoples R China.;[Hu, Xin-jiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Hu, Xin-jiang] South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Guangdong, Peoples R China.

通讯机构： [Liu, Yun-guo] H;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.

关键词： Adsorbents;Adsorption;Bond strength (chemical);Graphene;Hydrogen bonds;Ionic strength;Magnetism;Nanostructured materials;Pollution control;Solutions;Toxic materials;Adsorption mechanism;Back ground electrolyte;Graphene oxides;Nitrilotriacetic acid;Tetracycline;Gas adsorption;graphene oxide;nitrilotriacetic acid;tetracycline;graphite;magnetite nanoparticle;nanocomposite;nitrilotriacetic acid;oxide;sodium chloride;tetracycline;waste water;water pollutant;adsorption;amidation;Article;controlled study;desorption;hydrogen bond;infrared spectroscopy;ionic strength;isotherm;magnetic field;pH;priority journal;Raman spectrometry;scanning electron microscopy;surface property;transmission electron microscopy;X ray diffraction;zeta potential;chemistry;human;isolation and purification;kinetics;osmolarity;procedures;recycling;temperature;thermodynamics;ultrastructure;waste water;water management;water pollutant;Adsorption;Equipment Reuse;Graphite;Humans;Hydrogen Bonding;Hydrogen-Ion Concentration;Kinetics;Magnetite Nanoparticles;Nanocomposites;Nitrilotriacetic Acid;Osmolar Concentration;Oxides;Sodium Chloride;Temperature;Tetracycline;Thermodynamics;Waste Water;Water Pollutants, Chemical;Water Purification

摘要： A novel magnetic nanomaterial was synthesized by grafting nitrilotriacetic acid to magnetic graphene oxide (NDMGO), which was applied as an adsorbent for removing tetracycline (TC) from aqueous solutions. The nanomaterial was characterized using TG-DTA, SEM, TEM, XRD, VSM, XPS, Raman, BET surface area and zeta potential measurements. Several experimental conditions (solution pH, adsorption time, temperature, ionic strength and foreign ions) affecting the adsorption process were investigated. The results showed that the TC adsorption capacity could be affected by solution pH. The adsorption capacity of TC increased rapidly in the initial 20min and finally reached equilibrium was about 600min. The pseudo-second-order kinetics provided the better correlation for the experiment data. Various thermodynamic parameters indicated that the adsorption was a spontaneous and endothermic process. The presence of NaCl and background electrolytes in the solution had a slight influence on TC adsorption. Hydrogen bonds, amidation reaction, π-π and cation-π interaction between NDMGO and TC could be used to explain the adsorption mechanism. The regeneration experiment demonstrated that this nanomaterial possessed an excellent regeneration performance. Based on the experimental results and comparative analysis with other adsorbents, the NDMGO was a high-efficiency and reusable adsorbent for TC pollution control. © 2016 Elsevier Inc.

语种： 英文