环境修复
环境化学
镉
砷
化学
土壤污染
污染
硫酸盐
吸附
零价铁
土壤水分
降水
微观世界
煤矸石
环境工程
环境科学
土壤科学
生态学
气象学
物理化学
有机化学
物理
生物
作者
Min Chen,Yuzhi Zhou,Yongkang Sun,Xiaoyang Chen,Liang Yuan
出处
期刊:Chemosphere
[Elsevier]
日期:2023-10-01
卷期号:338: 139380-139380
被引量:5
标识
DOI:10.1016/j.chemosphere.2023.139380
摘要
Remediation of arsenic (As) and cadmium (Cd) co-contaminated soil is a challenge in environmental remediation. In this study, coal gangue-based magnetic porous material (MPCG) was designed for simultaneous immobilization of As and Cd in contaminated soil. After the incubation experiment, the effects of CG and MPCG on the availability and fractions of As and Cd and the related microbial functional genes were analyzed to explore the potential remediation mechanisms of MPCG for As and Cd in contaminated soil. The results showed that the stabilization effect of MPCG on As and Cd was significantly higher than that of coal gangue. It reduced the available As and Cd by 17.94-29.81% and 14.22-30.41%, respectively, and transformed unstable As/Cd to stable. The remediation mechanisms of MPCG on As included adsorption, oxidation, complexation and precipitation/co-precipitation. Meanwhile, the remediation mechanisms of MPCG for Cd included adsorption, ion exchange, complexation and precipitation. In addition, MPCG increases the abundance of sulfate-reducing bacteria (dsrA) by 43.39-381.28%, which can promote sulfate reduction. The sulfide can precipitate with As and Cd to reduce the availability of As and Cd in soil. Thus, MPCG is a promising amendment for achieving the remediation of As and Cd co-contaminated soil.
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