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| Remediation of Copper Contaminated Soil by Electrokinetic Method Combined with Iron-based Amorphous Osmotic Reaction Barrier |
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Received:December 12, 2021
Revised:December 21, 2021
Accepted:December 22, 2021
Published Online:April 12, 2022
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| DOI：doi：10.3969/j.issn.1007-7545.2015.02.014 |
| KeyWord:Fe78Si9B13AP; amorphous alloy; electrokinetic method; copper contamination; soil remediation; mobility |
| Author | Institution |
| PEI Lie-fei |
兰州理工大学 |
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| Abstract: |
| Fe-based amorphous alloy was used as osmotic barrier combined electrokinetic method (EK) to repair farmland soil contaminated by copper for the first time. In the experiment of simulating the actual external conditions, electrokinetic reactions with Fe78Si9B13AP amorphous powder and zero-valent iron (ZVI) as osmotic reaction barrier and no osmotic reaction barrier were carried out respectively. Migration and transformation performance of Cu2+ during electrokinetic process was analyzed by continuous soil extraction. The results show that content of total copper in soil in Fe78Si9B13AP-EK can be reduced to 17.3%, and ZVI-EK can be reduced to 25.1%, while EK alone can only be reduced to 32.5%. It is found that there are a large number of vertical and reaction interface pore structures in the product layer on the surface of Fe78Si9B13AP, which promotes mass transfer process of Cu2+, transforms transferable Cu2+ into stable Cu0, and eliminates the reverse potential caused by accumulation of Cu2+ in time. On this basis, the best experimental group Fe78Si9B13AP-EK was selected to remediate the actual copper contaminated soil. The results show that remediation effect of this method is greatly affected by chemical form of copper in contaminated soil, and removal rate of copper in migration state is 65.2%. Therefore, Fe78Si9B13AP is expected to replace ZVI as a new environmental functional material in field of soil remediation. |
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