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： Antioxidative system;Salix matsudana;Spermidine;cadmium;chemical forms;subcellular distribution

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： 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 mechanism;Ciprofloxacin;Diethylenetriaminepentaacetic acid;Magnetic graphene oxide;Tetracycline

摘要： Adsorption of tetracycline (TC) and ciprofloxacin (CIP) in single and binary systems by diethylenetriamine-pentaacetic 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 Delta G degrees values hinted the spontaneous nature of TC and CIP sorption. Moreover, the Delta H degrees 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 pi-pi interaction, hydrogen bonds and amidation reaction. Besides, TC and CIP uptake could also be explained by cation-pi and electrostatic interaction, respectively. These findings showed that DDMGO was an efficient and reusable adsorbent for antibiotics elimination. (C) 2018 Elsevier Inc. All rights reserved.

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： biochar;titanium dioxide;composite;adsorption;photocatalytic;degradation

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&ndash;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 TiO<inf>2</inf>was successfully loaded on the biochar substrate. The biochar and TiO<inf>2</inf>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 TiO<inf>2</inf>significantly enhanced the adsorption performance of biochar and the high specific surface area of the biochar synergistically promoted the photocatalytic activity of TiO<inf>2</inf>. 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. &copy;2017 Society of Chemical Industry.<br/> &copy;2017 Society of Chemical Industry

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： graphene oxide;copper ions;external influences;pollutant removal mechanisms

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. &copy;2018 Society of Chemical Industry.<br/> &copy;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 Ca 2+ and Cd 2+ fluxes of P. chrysosporium were quantified using the noninvasive microtest technique. Ca 2+ influx decreased significantly under cadmium exposure, and the Ca 2+ channel was involved in Ca 2+ and Cd 2+ influx. The cadmium and/or calcium uptake results coupled with the real-time Ca 2+ and Cd 2+ 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： 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, 17β-estradiol (E2) and 17α-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 π–π 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. © 2017

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： ferric ions;formate;graphene [email protected]2;hexavalent chromium;inorganic anions

摘要： BACKGROUND: In this study, a graphene oxide@TiO<inf>2</inf>composite (GO/TiO<inf>2</inf>) was prepared and characterized by SEM, EDX, XRD, nitrogen adsorption&ndash;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. RESULTS: 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<inf>4</inf>^2&minus;and PO<inf>4</inf>^3&minus;on the process were higher than those of Cl^&minus;and NO<inf>3</inf>^&minus;. Formate slightly inhibited adsorption of Cr(VI), while it improved Cr(VI) reduction. GO/TiO<inf>2</inf>has good stability and it maintained full photoreduction activity for at least three cycles. CONCLUSION: The results indicated that GO/TiO<inf>2</inf>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<inf>2</inf>and alter the electron-transfer pathways. The results suggest that the GO/TiO<inf>2</inf>is an attractive material for removing hexavalent chromium from water using a photocatalytic process. &copy;2018 Society of Chemical Industry.<br/> &copy;2018 Society of Chemical Industry

语种： 英文

作者： Li, Mei-fang;Liu, Yun-guo*;Liu, Shao-bo*;Shu, Ding;Zeng, Guang-ming;...

期刊： Chemical Engineering Journal,2017年319:219-228 ISSN：1385-8947

通讯作者： Liu, Yun-guo;Liu, Shao-bo

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, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Hunan, Peoples R China.;[Liu, Shao-bo] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.;[Shu, Ding] Cent S Univ, Light Alloy Res Inst, Changsha 410083, Hunan, Peoples R China.;[Hu, Xin-jiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Liu, Yun-guo] H;[Liu, Shao-bo] C;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.

关键词： Adsorption mechanism;Ciprofloxacin;Cu(II);Magnetic graphene oxide;Nitrilotriacetic acid

摘要： Nitrilotriacetic acid-functionalized magnetic graphene oxide (NDMGO) was developed for the removal of ciprofloxacin (CIP) with and without the presence of Cu(II). The physicochemical properties of NDMGO were characterized using SEM, TEM, XRD, FI-IR, XPS and zeta potential measurements. The CIP adsorption process could be better simulated by the pseudo-second-order kinetics and Freundlich isotherm model. Effects of Cu(II) concentrations on CIP uptake, as well as the influence of pH, ionic strength, background electrolyte and the addition sequences of CIP/Cu(II) were investigated. Adsorption results exhibited that the presence of Cu(II) obviously enhanced the CIP adsorption capability through Cu(II) bridging effect. The adsorption capacity for CIP was stronger in the (CIP-Cu(II))-NDMGO system than in the (NDMGO-Cu(II))-CIP and (NDMGO-CIP)-Cu(II) systems. Meanwhile, this nanomaterial showed high performance for Cu(II) adsorption. In addition to Cu(II) bridge enhancement, the mechanism could also be explained by hydrogen bonds, amidation reaction, electrostatic and π-π interaction. These results provided valuable information for the removal of CIP and improved our understanding on reaction mechanism of antibiotics by NDMGO in the presence of metal ions, demonstrated that NDMGO could be developed as an effective adsorbent to simultaneously removal metal ions and organic substances. © 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： *Adsorption mechanism;*Background electrolytes;*Ionic strength;*Magnetic graphene oxide;*Nitrilotriacetic acid;*Tetracycline

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 20 min and finally reached equilibrium was about 600 min. 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.

语种： 英文

作者： Hu, Xinjiang*;Zhao, Yunlin*;Wang, Hui;Tan, Xiaofei;Yang, Yuanxiu;...

期刊： International Journal of Environmental Research and Public Health,2017年14(12) ISSN：1661-7827

通讯作者： Hu, Xinjiang;Zhao, Yunlin

作者机构： [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; Zhao, YL] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Hu, Xinjiang; Yang, Yuanxiu] South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Guangdong, Peoples R China.;[Wang, Hui] Chinese Acad Agr Sci, Inst Bast Fiber Crops, Changsha 410205, Hunan, Peoples R China.;[Liu, Yunguo; Tan, Xiaofei] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Hu, XJ; Zhao, YL] C;[Hu, Xinjiang] S;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.;South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Guangdong, Peoples R China.

关键词： *Fe3O4@GO;*antibiotic wastewater;*humic acid;*ionic strength;*tetracycline

摘要： A readily separated composite was prepared via direct assembly of Fe3O4 magnetic nanoparticles onto the surface of graphene oxide (GO) (labeled as Fe3O4@GO) and used as an adsorbent for the removal of tetracycline (TC) from wastewater. The effects of external environmental conditions, such as pH, ionic strength, humic acid (HA), TC concentration, and temperature, on the adsorption process were studied. The adsorption data were analyzed by kinetics and isothermal models. The results show that the Fe3O4@GO composite has excellent sorptive properties and can efficiently remove TC. At low pH, the adsorption capacity of Fe3O4@GO toward TC decreases slowly with increasing pH value, while the adsorption capacity decreases rapidly at higher pH values. The ionic strength has insignificant effect on TC adsorption. The presence of HA affects the affinity of Fe3O4@GO to TC. The pseudo-second-order kinetics model and Langmuir model fit the adsorption data well. When the initial concentration of TC is 100 mg/L, a slow adsorption process dominates. Film diffusion is the rate limiting step of the adsorption. Importantly, Fe3O4@GO has good regeneration performance. The above results are of great significance to promote the application of Fe3O4@GO in the treatment of antibiotic wastewater. © 2017 by the authors. Licensee MDPI, Basel, Switzerland.

语种： 英文

作者： Yang, Yuanxiu;Hu, Xinjiang*;Zhao, Yunlin;Cui, Lihua*;Huang, Zhujian;...

期刊： Journal of Colloid and Interface Science,2017年495:68-77 ISSN：0021-9797

通讯作者： Hu, Xinjiang;Cui, Lihua

作者机构： [Xu, Jiawen; Hu, Xinjiang; Cui, Lihua; Yang, Yuanxiu; Huang, Zhujian; Long, Jianliang; Wu, Cuiyu; Li, Wenwei; Deng, Jianbin] South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Guangdong, Peoples R China.;[Hu, Xinjiang; Zhao, Yunlin] 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 410004, Hunan, Peoples R China.

通讯机构： [Hu, XJ; Cui, LH] S;South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Guangdong, Peoples R China.

关键词： *Chemical interaction;*Graphene oxide nanosheets;*Tetracycline;*Thiourea dioxide

摘要： Thiourea-dioxide–reduced magnetic graphene oxide (TDMGO) was successfully prepared as an efficient adsorbent for the removal of tetracycline (TC) from aqueous solutions via strong adsorptive interactions. The composite was characterized by SEM, TEM, EDS, TGA, FT-IR, XPS, XRD and VSM. The effects of variables such as the pH, TC concentration, and temperature were successfully analyzed. The kinetics and isothermal parameters were described well by pseudo-second-order and Langmuir isotherm models, respectively, and the maximum adsorption capacity (qm) of TDMGO for TC calculated from the Langmuir isotherm was 1233 mg/g at 313 K. The removal of TC onto TDMGO, as indicated by the thermodynamic parameters, was spontaneous and endothermic. The removal performance was slightly affected by the solution pH. The presence of NaCl in the solution facilitated TC adsorption, and the optimum adsorption capacity was obtained when the NaCl concentration was >0.001 M. The adsorption capacity decreased slightly with increasing humic acid concentration. In addition, the adsorbent could be regenerated and reused. Based on these results, TDMGO is a promising adsorbent for the efficient removal of TC antibiotics from aquatic environments for pollution treatment.

语种： 英文

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

期刊： Environmental Science & Technology,2017年51(11):6352-6359 ISSN：0013-936X

通讯作者： Liu, Yunguo;Liu, Shaobo

作者机构： [Jiang, Luhua; Liu, Yunguo; Zeng, Guangming; Tan, Xiaofei; Guo, Zhi; Wu, Zhibin] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Jiang, Luhua; Liu, Yunguo; Zeng, Guangming; Tan, Xiaofei; Guo, Zhi; Wu, Zhibin] Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Hunan, Peoples R China.;[Liu, Shaobo] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.;[Hu, Xi; Hu, Xinjiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn Res, Changsha 410004, Hunan, Peoples R China.;[Wang, Lele] Univ Queensland, AWMC, Brisbane, Qld 4072, Australia.

通讯机构： [Liu, Yunguo] H;[Liu, Shaobo] C;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Hunan, Peoples R China.;Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.

摘要： Adsorption of two estrogen contaminants (17β-estradiol and 17α-ethynyl estradiol) by graphene nanomaterials was investigated and compared to those of a multi-walled carbon nanotube (MWCNT), a single-walled carbon nanotube (SWCNT), two biochars, a powdered activated carbon (PAC), and a granular activate carbon (GAC) in ultrapure water and in the competition of natural organic matter (NOM). Graphene nanomaterials showed comparable or better adsorption ability than carbon nanotubes (CNTs), biochars (BCs), and activated carbon (ACs) under NOM preloading. The competition of NOM decreased the estrogen adsorption by all adsorbents. However, the impact of NOM on the estrogen adsorption was smaller on graphenes than CNTs, BCs, and ACs. Moreover, the hydrophobicity of estrogens also affected the uptake of estrogens. These results suggested that graphene nanomaterials could be used to removal estrogen contaminants from water as an alternative adsorbent. Nevertheless, if transferred to the environment, they would also adsorb estrogen contaminants, leading to great environmental hazards. © 2017 American Chemical Society.

语种： 英文

作者： Hu, Xi;Hu, Xinjiang*;Tang, Chunfang*;Wen, Shizhi;Wu, Xiaofu;...

期刊： Chemical Engineering Journal,2017年330:355-371 ISSN：1385-8947

通讯作者： Hu, Xinjiang;Tang, Chunfang

作者机构： [Hu, Xi; Tang, Chunfang; Hu, Xinjiang; Long, Jian; Wu, Xiaofu; Wen, Shizhi; Tang, CF; Yang, Xiong] 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.;[Zhou, Lu] Changsha Univ Sci & Technol, Coll Hydraul Engn, Changsha 410004, Hunan, Peoples R China.

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

关键词： Intermediates;Microcystin-LR;Photodegradation;Titanium dioxide;Water treatment

摘要： The presence of cyanotoxins in different water sources, originating from cyanobacterial algal blooms, is a ubiquitous, global concern. Microcystins (MCs) are the most commonly occurring class of cyanbacterial toxin, and are characterized as cyclic heptapeptides containing five D-amino acids and two variable L-amino acids. Over 100 MC variants exist, and microcystin-LR (MC-LR) is one of the most hazardous and prevalent. Removing MC-LR from aqueous solutions by titanium dioxide (TiO2) photocatalysis has been proposed as a possible solution for this. Both metal and non-metal doped TiO2 photocatalysts have been investigated over recent decades for their MC-LR photocatalytic degradation properties under visible light. This review provides an overview of visible light-activated TiO2 synthesis technologies, and structural and electronical properties. The photocatalytic behavior of visible light-activated TiO2 for the photodegradation of MC-LR is discussed. The structural elucidation of reaction intermediates of the degradation pathways, and the mechanisms of MC-LR degradation by visible-light activated TiO2 in comparison with conventional UV-activated TiO2, is given particular emphasis. We also aimed to identify research gaps and uncertainties that exist for the use of visible light-activated TiO2 in photocatalysis. Additional research requirements for visible light-activated TiO2 photocatalysts and potential areas for future applications of doped TiO2 photocatalysts under visible light are also proposed.

语种： 英文

作者： Tan, Xiao-fei;Liu, Shao-bo;Liu, Yun-guo*;Gu, Yan-ling;Zeng, Guang-ming;...

期刊： Bioresource Technology,2017年227:359-372 ISSN：0960-8524

通讯作者： Liu, Yun-guo

作者机构： [Gu, Yan-ling; Jiang, Lu-hua; Liu, Yun-guo; Liu, Shao-heng; Tan, Xiao-fei; Hua, Xin-jiang; Zeng, Guang-ming] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Gu, Yan-ling; Jiang, Lu-hua; Liu, Yun-guo; Liu, Shao-heng; Tan, Xiao-fei; Hua, Xin-jiang; Zeng, Guang-ming] Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Hunan, Peoples R China.;[Liu, Shao-bo] Cent S Univ, Sch Architecture & Art, Changsha 410082, Hunan, Peoples R China.;[Liu, Shao-bo] Cent S Univ, Sch Met & Environm, Changsha 410083, Peoples R China.;[Hua, Xin-jiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn Res, Changsha 410004, Hunan, 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： *Activated carbon;*Biochar;*CO(2) capture;*Energy storage;*Water pollution treatment

摘要： There is a growing interest of the scientific community on production of activated carbon using biochar as potential sustainable precursors pyrolyzed from biomass wastes. Physical activation and chemical activation are the main methods applied in the activation process. These methods could have significantly beneficial effects on biochar chemical/physical properties, which make it suitable for multiple applications including water pollution treatment, CO2capture, and energy storage. The feedstock with different compositions, pyrolysis conditions and activation parameters of biochar have significant influences on the properties of resultant activated carbon. Compared with traditional activated carbon, activated biochar appears to be a new potential cost-effective and environmentally-friendly carbon materials with great application prospect in many fields. This review not only summarizes information from the current analysis of activated biochar and their multiple applications for further optimization and understanding, but also offers new directions for development of activated biochar. © 2016 Elsevier Ltd

语种： 英文

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

期刊： Chemical Engineering Journal,2017年308:597-605 ISSN：1385-8947

通讯作者： Liu, Yunguo;Liu, Shaobo

作者机构： [Jiang, Luhua; Liu, Yunguo; Zeng, Guangming; Liu, Shaoheng; Liu, Simian; Li, Meifang; Huang, Binyan] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Jiang, Luhua; Liu, Yunguo; Zeng, Guangming; Liu, Shaoheng; Liu, Simian; Li, Meifang; Huang, Binyan] 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, Hunan, Peoples R China.;[Hu, Xinjiang] South China Agr Univ, Coll Nat Resources & Environm, Guangzhou 510642, Guangdong, Peoples R China.;[Hu, Xi; Hu, Xinjiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn Res, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Liu, Yunguo] H;[Liu, Shaobo] C;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.

关键词： 17 beta-Estradiol;Adsorption;Poly-L-glutamic acid;beta-Cyclodextrin;Graphene oxide

摘要： A novel adsorbent, namely, beta-cyclodextrin/poly (L-glutamic acid) supported magnetic graphene oxide (CGMG), was synthesized through a facile chemical route and its application as excellent adsorbent for 17 beta-estradiol (E2) removal from aqueous solution was also demonstrated. The characteristics of CGMG were investigated via using Fourier transform infrared spectrometer, X-ray photoelectron spectroscopy, Raman spectra, X-ray diffraction, vibrating sample magnetometer and Brunauer-Emmett-Teller surface area, respectively. Results indicated that CGMG was successfully prepared and the saturated magnetization could reach up to 0.09043 emu/mg. Meanwhile, investigation of adsorption behavior illustrated that the adsorption process could be better fitted by the pseudo-second-order and Langmuir models. Analysis of intraparticle diffusion model demonstrated that intraparticle diffusion was not the only rate-limiting step; however, both film diffusion and intraparticle diffusion were involved in the diffusion process. Thermodynamic study indicated that adsorption of E2 onto CGMG was spontaneous and endothermic. The E2 uptake by CGMG decreased in high pH values. However, it was insensitive to ionic strength variation (0.0-0.1 M). Moreover, the regeneration experiments illustrated that CGMG could be recovered, and it showed good recycling ability with ca. 88.7% of the initial sorption capacity after being used for sixth cycles. (C) 2016 Elsevier B.V. All rights reserved.

语种： 英文

作者： Tang, Chunfang;Song, Jinfeng;Hu, Xi;Hu, Xinjiang*;Zhao, Yunlin*;...

期刊： Ecological Engineering,2017年107:41-48 ISSN：0925-8574

通讯作者： Hu, Xinjiang;Zhao, Yunlin

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

关键词： Accumulation;Antioxidant syste;Lead;Salix matsudana;Spermidine;Tolerance

摘要： The protective role of spermidine addition in media to Salix matsudana exposed to Pb was investigated by a hydroponic experiment in this study. The application of spermidine enhanced the biomass of S. matsudana exposed to Pb. Pb induced an increase in Pb levels in all organs of S. matsudana with the order of roots (maximum of 27616.0&nbsp;mg/kg DW)&nbsp;&gt;&nbsp;cuttings&nbsp;&gt;&nbsp;twigs&nbsp;&gt;&nbsp;leaves. Exogenous spermidine promoted the accumulation of Pb in the roots, but inhibited the Pb translocation to the shoots and thus the Pb content in the twigs and leaves. The Pb-induced decrease in the concentrations of spermidine, soluble protein, and nitric oxide was elevated by the application of spermidine in the leaves of S. matsudana. Exogenous spermidine could also effectively up-regulate the antioxidative capacity and reduced the accumulation of superoxide anion, hydrogen peroxide, malondialdehyde, and putrescine. The results suggested that S. matsudana could accumulate a high level of Pb in the roots, and exogenous spermidine could enhance S. matsudana tolerance to Pb by the synergistic promotion of Pb accumulation in the roots and the levels of spermidine, nitric oxide, and antioxidants in the leaves. &copy;2017 Elsevier B.V.

语种： 英文

作者： Tan, Xiao-fei;Liu, Yun-guo*;Gu, Yan-ling;Xu, Yan;Zeng, Guang-ming;...

期刊： Bioresource Technology,2016年212:318-333 ISSN：0960-8524

通讯作者： Liu, Yun-guo

作者机构： [Gu, Yan-ling; Xu, Yan; Liu, Yun-guo; Liu, Si-mian; Li, Jiang; Tan, Xiao-fei; Hu, Xin-jiang; Zeng, Guang-ming] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Gu, Yan-ling; Xu, Yan; Liu, Yun-guo; Liu, Si-mian; Li, Jiang; Tan, Xiao-fei; Hu, Xin-jiang; Zeng, Guang-ming] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.;[Liu, Shao-bo] Cent S Univ, Sch Architecture & Art, Changsha 410082, Hunan, Peoples R China.;[Liu, Shao-bo] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.;[Hu, Xin-jiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn Res, Changsha 410004, Hunan, 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： Adsorption;Biochar;Catalytic degradation;Nano-composites;Synthesis;Wastewater

摘要： Synthesizing biochar-based nano-composites can obtain new composites and combine the advantages of biochar with nano-materials. The resulting composites usually exhibit great improvement in functional groups, pore properties, surface active sites, catalytic degradation ability and easy to separation. These composites have excellent abilities to adsorb a range of contaminants from aqueous solutions. Particularly, catalytic material-coated biochar can exert simultaneous adsorption and catalytic degradation function for organic contaminants removal. Synthesizing biochar-based nano-composites has become an important practice for expanding the environmental applications of biochar and nanotechnology. This paper aims to review and summarize the various synthesis techniques for biochar-based nano-composites and their effects on the decontamination of wastewater. The characteristic and advantages of existing synthesis methods are summarized and discussed. Application of biochar-based nano-composites for different contaminants removal and the underlying mechanisms are reviewed. Furthermore, knowledge gaps that exist in the fabrication and application of biochar-based nano-composites are also identified. © 2016 Elsevier Ltd.

语种： 英文

作者： Tan, Xiaofei;Liu, Shaobo*;Liu, Yunguo*;Gu, Yanling;Zeng, Guangming;...

期刊： Scientific Reports,2016年6(1):39691 ISSN：2045-2322

通讯作者： Liu, Yunguo;Liu, Shaobo

作者机构： [Liu, Yunguo; Gu, Yanling; Zeng, Guangming; Yang, Chunping; Tan, Xiaofei; Cai, Xiaoxi; Yan, ZhiLi; Hu, Xinjiang; Chen, Bo] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Liu, Yunguo; Gu, Yanling; Zeng, Guangming; Yang, Chunping; Tan, Xiaofei; Cai, Xiaoxi; Yan, ZhiLi; Hu, Xinjiang; Chen, Bo] 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, Hunan, Peoples R China.;[Liu, Shaobo] Cent S Univ, Sch Architecture & Art, Changsha 410083, Hunan, Peoples R China.;[Hu, Xinjiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn Res, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Liu, Yunguo] H;[Liu, Shaobo] C;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.;Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.

摘要： A biochar supported calcined-Mg/Al layered double hydroxides composite (CLDHs/BC) was synthesized by a one-pot slow pyrolysis of LDHs preloaded bagasse biomass. Multiple characterizations of the product illustrated that the calcined-Mg/Al layered double hydroxides (CLDHs) were successfully coated onto the biochar in slow pyrolysis of pre-treated biomass. The as-synthesized CLDHs/BC could efficiently remove antibiotic tetracycline from aqueous solutions. The coating of CLDHs significantly increased the adsorption ability of biochar, and CLDHs/BC exhibited more than 2 times higher adsorption capacity than that of the pristine biochar (BC) in the tested pH range. The maximum adsorption capacity of CLDHs/BC for tetracycline was 1118.12 mg/g at 318 K. The experimental results suggested that the interaction with LDHs on biochar played a dominant role in tetracycline adsorption, accompanied with π–π interaction and hydrogen bond. This study provides a feasible and simple approach for the preparation of high-performance material for antibiotics contaminated wastewater treatment in a cost-effective way.

语种： 英文