期刊：
Journal of Soils and Sediments,2021年21(7):2686-2698 ISSN：1439-0108
通讯作者：
Shunhong Huang<&wdkj&>Liang Chen
作者机构：
[Huang, Shunhong; Cheng, Bairui; Chen, Zhuo; Huang, Hui; Li, Mengfei] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Chen, Liang] Hunan Res Acad Environm Sci, Changsha 410004, Peoples R China.
通讯机构：
[Shunhong Huang] C;[Liang Chen] H;Collage of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, China<&wdkj&>Hunan Research Academy of Environmental Sciences, Changsha, China
摘要：
Sixteen treatments of soil contaminated by Cu, Pb, and Zn by the addition of a different percentage of biochar and compost were incubated for 120days. The abundance of denitrifying genes such as narG, nirK, nirS and nosZ and the ammonia-oxidizing amoA genes of ammonia-oxidizing archaea/bacteria (AOA/AOB), soil nitrite reductase activity (S-NiR) and their shaping factors were also determined. The relationships between functional genes, S-NiR, and physico-chemical parameters were analyzed using the Pearson correlation method. The study found that the changes in physico-chemical parameters, including water-soluble organic carbon (WSC), nitrate (NO3(-)) and ammonium (NH4(+)), were predominant in different treatments. The abundance of nirK and narG genes is most sensitive to the changes in the properties of the soil sample. Bacterial 16S rDNA gene abundance was significantly affected by NO3(-) and S-NiR (P<0.05). Nitrifying genes were mainly correlated to WSC and S-NiR, while denitrifying genes were associated with pH, electrical conductivity, NO3(-) and S-NiR. The systematic study for the relationship between the genes and the environmental parameters will help us to deep understand the biological mechanisms of nitrogen cycle in heavy metal contaminated soils remediated by biochar and compost.
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.
摘要：
In this study, a novel method based on the magnetic Fe/C crosslinked nanoparticles (MNZVI/CNTs-OH) is reported for the effective removal of Cr(VI) in aqueous solutions. Parameters that influence the effectiveness of the nanoparticles, such as pH, temperature, reaction time, and particle dosage, was analyzed. It was found that MNZVI/CNTs-OH particles exhibit significantly higher activity toward Cr(VI) removal than bare NZVI, carbon nanotubes (CNTs), and other synthetic nanomaterials. Under optimized conditions, the removal efficiency of Cr(VI) by MNZVI/CNTs-OH is up to 98% with an initial contaminant concentration of 50 mg/L, and chromium content in the residue up to 48 mg/g. Physical characterizations, including Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and TG-TD measurements, provide insights into the working mechanism of Cr(VI) purification. Our findings suggest that immobilization of MNZVI onto carbon nanotubes increase the covalent bond property, while crosslinked nanoparticles (NPs) provide the electron transfer passage from the NZVI surface and improves the dispersity of the MNZVI, thus enhancing the performance. These results demonstrate the potential of the MNZVI/CNTs-OH nanoparticles for the rapid and efficient treatment of Cr(VI)-containing wastewater.
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.
作者机构：
[朱健; 王平; 夹书珊; 李猛; 雷明婧] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China
通讯机构：
College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, China
