title: Enhanced Cr(VI) removal from groundwater by Fe0-H2O system with bio-amended iron corrosion.
abstract: A one-pot bio-iron system was established to investigate synergetic abiotic and biotic effects between iron and microorganisms on Cr(VI) removal. More diverse iron corrosion and reactive solids, such as green rusts, lepidocrocite and magnetite were found in the bio-iron system than in the Fe0-H2O system, leading to 4.3 times higher Cr(VI) removal efficiency in the bio-iron system than in the Fe0-H2O system. The cycling experiment also showed that the Cr(VI) removal capacity of Fe0in the bio-iron system was 12.4 times higher than that in the Fe0-H2O system. A 62days of life-span could be achieved in the bio-iron system, while the Fe0-H2O system lost its efficacy after 30days. Enhanced effects of extra Fe2+on Cr(VI) removal was observed, largely contributed to the adsorbed Fe2+on iron surface, which could function as an extra reductant for Cr(VI) and promote the electron transfer on the solid phase. The results also showed that the reduction of Cr(VI) by microorganisms was insignificant, indicating the adsorption/co-precipitation of Cr by iron oxides on iron surface was responsible for the overall Cr(VI) removal. Our study demonstrated that the bio-amended iron corrosion could improve the performance of Fe0for Cr(VI) removal from groundwater.
authors.affiliation: The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, State Key Laboratory of Pulp and Paper Engineering, The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; Department of Plant and Environmental Sciences, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg C DK-1871, Denmark.
authors.forename: Weizhao
authors.initials: W
authors.lastname: Yin
authors.affiliation: School of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, PR China.
authors.forename: Yongtao
authors.initials: Y
authors.lastname: Li
authors.affiliation: The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, State Key Laboratory of Pulp and Paper Engineering, The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China. Electronic address: jinhuawu@scut.edu.cn.
authors.forename: Jinhua
authors.initials: J
authors.lastname: Wu
authors.affiliation: The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, State Key Laboratory of Pulp and Paper Engineering, The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
authors.forename: Guocai
authors.initials: G
authors.lastname: Chen
authors.affiliation: School of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China.
authors.forename: Gangbiao
authors.initials: G
authors.lastname: Jiang
authors.affiliation: The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, State Key Laboratory of Pulp and Paper Engineering, The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.affiliation: Water Purification Institute of Logistics Department of Guangzhou Military Region, Guangzhou 510500, PR China.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Gu
authors.affiliation: Water Purification Institute of Logistics Department of Guangzhou Military Region, Guangzhou 510500, PR China.
authors.forename: Hao
authors.initials: H
authors.lastname: Liang
authors.affiliation: Water Purification Institute of Logistics Department of Guangzhou Military Region, Guangzhou 510500, PR China.
authors.forename: Chuansheng
authors.initials: C
authors.lastname: Liu
mesh_terms: D019149:Bioreactors; D002857:Chromium / Q000302:isolation & purification*; D003343:Corrosion; D060587:Groundwater; D007501:Iron / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; D007501:Iron
keywords: Hexavalent chromium; Reactive minerals; Zero valent iron