title: Wheat straw biochar-supported nanoscale zerovalent iron for removal of trichloroethylene from groundwater.
abstract: This study synthesized the wheat straw biochar-supported nanoscale zerovalent iron (BC-nZVI) via in-situ reduction with NaBH4 and biochar pyrolyzed at 600°C. Wheat straw biochar, as a carrier, significantly enhanced the removal of trichloroethylene (TCE) by nZVI. The pseudo-first-order rate constant of TCE removal by BC-nZVI (1.079 h-1) within 260 min was 1.4 times higher and 539.5 times higher than that of biochar and nZVI, respectively. TCE was 79% dechlorinated by BC-nZVI within 15 h, but only 11% dechlorinated by unsupported nZVI, and no TCE dechlorination occurred with unmodified biochar. Weakly acidic solution (pH 5.7-6.8) significantly enhanced the dechlorination of TCE. Chloride enhanced the removal of TCE, while SO42-, HCO3- and NO3- all inhibited it. Humic acid (HA) inhibited BC-nZVI reactivity, but the inhibition decreased slightly as the concentration of HA increased from 40 mg∙L-1 to 80 mg∙L-1, which was due to the electron shutting by HA aggregates. Results suggest that BC-nZVI was promising for remediation of TCE contaminated groundwater.
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, P.R. China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, P.R. China.
authors.forename: Ya Qin
authors.initials: YQ
authors.lastname: Chen
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, P.R. China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Chen
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, P.R. China.|School of Bioengineering, East China University of Science and Technology, Shanghai, P.R. China.
authors.forename: Xiao Li
authors.initials: XL
authors.lastname: Wang
authors.affiliation: Center of Environmental Health Research, South China Institute of Environmental Sciences, Guangzhou, P.R. China.
authors.forename: Shu
authors.initials: S
authors.lastname: Guo
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, P.R. China.
authors.forename: Yue Feng
authors.initials: YF
authors.lastname: Qiu
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, P.R. China.
authors.forename: Yong Di
authors.initials: YD
authors.lastname: Liu
authors.affiliation: School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, China.
authors.forename: Xiao Li
authors.initials: XL
authors.lastname: Duan
authors.affiliation: Center of Environmental Health Research, South China Institute of Environmental Sciences, Guangzhou, P.R. China.
authors.forename: Yun Jiang
authors.initials: YJ
authors.lastname: Yu
mesh_terms: D000327:Adsorption; D000838:Anions / Q000737:chemistry; D002606:Charcoal / Q000737:chemistry; D060587:Groundwater / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron; D007700:Kinetics; D014241:Trichloroethylene; D014908:Triticum / Q000737:chemistry; D014874:Water Pollutants, Chemical
chemical_list: D000838:Anions; D014874:Water Pollutants, Chemical; C540010:biochar; D002606:Charcoal; D014241:Trichloroethylene; D007501:Iron