Enhanced Cr(VI) removal from groundwater by Fe⁰-H₂O system with bio-amended iron corrosion

TY - JOUR

T1 - Enhanced Cr(VI) removal from groundwater by Fe0-H2O system with bio-amended iron corrosion

AU - Yin, Weizhao

AU - Li, Yongtao

AU - Wu, Jinhua

AU - Chen, Guocai

AU - Jiang, Gangbiao

AU - Li, Ping

AU - Gu, Jingjing

AU - Liang, Hao

AU - Liu, Chuansheng

PY - 2017

Y1 - 2017

N2 - 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 Fe0 in the bio-iron system was 12.4 times higher than that in the Fe0-H2O system. A 62 days of life-span could be achieved in the bio-iron system, while the Fe0-H2O system lost its efficacy after 30 days. 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 Fe0 for Cr(VI) removal from groundwater.

AB - 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 Fe0 in the bio-iron system was 12.4 times higher than that in the Fe0-H2O system. A 62 days of life-span could be achieved in the bio-iron system, while the Fe0-H2O system lost its efficacy after 30 days. 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 Fe0 for Cr(VI) removal from groundwater.

KW - Reactive minerals

U2 - 10.1016/j.jhazmat.2017.02.045

DO - 10.1016/j.jhazmat.2017.02.045

M3 - Journal article

C2 - 28279872

SN - 0304-3894

VL - 332

SP - 42

EP - 50

JO - Journal of Hazardous Materials

JF - Journal of Hazardous Materials

ER -