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.
School of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, PR China.
J Hazard Mater. 2017 Jun 15;332:42-50. doi: 10.1016/j.jhazmat.2017.02.045. Epub 2017 Feb 27.
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 Fe-HO system, leading to 4.3 times higher Cr(VI) removal efficiency in the bio-iron system than in the Fe-HO system. The cycling experiment also showed that the Cr(VI) removal capacity of Fe in the bio-iron system was 12.4 times higher than that in the Fe-HO system. A 62days of life-span could be achieved in the bio-iron system, while the Fe-HO system lost its efficacy after 30days. Enhanced effects of extra Fe on Cr(VI) removal was observed, largely contributed to the adsorbed Fe 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 Fe for Cr(VI) removal from groundwater.
建立了一锅生物铁体系，以研究铁与微生物之间的非生物和生物协同作用对六价铬（Cr(VI)）的去除效果。与 Fe-HO 体系相比，生物铁体系中发现了更多种类的铁腐蚀和反应性固体，如绿锈、纤铁矿和磁铁矿，从而使 Cr(VI)的去除效率提高了 4.3 倍。循环实验还表明，生物铁体系中 Fe 的 Cr(VI)去除容量比 Fe-HO 体系高 12.4 倍。生物铁体系的寿命可达 62 天，而 Fe-HO 体系在 30 天后就失去了效果。观察到额外的 Fe 对 Cr(VI)去除有增强效果，这主要归因于铁表面吸附的 Fe，它可以作为 Cr(VI)的额外还原剂，并促进固相反应中的电子转移。结果还表明，微生物对 Cr(VI)的还原作用并不显著，表明铁表面的氧化铁对 Cr(VI)的吸附/共沉淀是整体去除 Cr(VI)的原因。本研究表明，生物添加的铁腐蚀可以提高 Fe 从地下水去除 Cr(VI)的性能。
