Chromium stabilization by polysulfide supported nZVI@biochar in contaminated soil: Cr bioavailability and stabilization mechanism

IF 3.7 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Central South University Pub Date : 2024-06-13 DOI:10.1007/s11771-024-5599-2

Jin-song Chen, Xin Wang, Xin-yao Yan, Xiao-ke Wang, Hui Ma, Sheng-yan Pu

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Abstract

Chromium (Cr) contamination in soil is one of the most severe environmental issues, which poses significant health hazards to humans. In this study, the stabilization mechanism of Cr-contaminated soil by polysulfide-supported nZVI@biochar (PS-nZVI@BC) and the resultant bioavailability of Cr was studied. The addition of PS-nZVI@BC is capable of decreasing 92.0% of leachable Cr(VI) in the soil after 30 days of treatment. According to sequential extraction analysis, the exchangeable Cr in soil decreased drastically from 20.8% to 4.0% after PS-nZVI@BC addition, which was mostly converted to Fe-Mn oxided and organic matter-bound forms. The stabilization mechanisms include electrostatic adsorption, redox reaction, surface complexation, and precipitation. The soil fertility of Cr-contaminated soil was effectively improved by PS-nZVI@BC, and the toxicity of Cr in soil to maize seedlings was reduced. These results demonstrated the great potential of utilizing PS-nZVI@BC for the remediation of Cr-contaminated soils.

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多硫化物支撑的 nZVI@ 生物炭在受污染土壤中稳定铬：铬的生物利用率和稳定机制

土壤中的铬（Cr）污染是最严重的环境问题之一，对人类健康造成重大危害。本研究研究了多硫化物支撑的 nZVI@生物炭（PS-nZVI@BC）对铬污染土壤的稳定机制以及由此产生的铬的生物利用率。经过 30 天的处理后，添加 PS-nZVI@BC 能够降低土壤中 92.0% 的可浸出六价铬。根据序贯萃取分析，添加 PS-nZVI@BC 后，土壤中的可交换铬从 20.8%急剧下降至 4.0%，大部分转化为铁锰氧化物和有机物结合形式。稳定机制包括静电吸附、氧化还原反应、表面络合和沉淀。PS-nZVI@BC 能有效改善铬污染土壤的肥力，降低土壤中的铬对玉米幼苗的毒性。这些结果表明了利用 PS-nZVI@BC 对受铬污染的土壤进行修复的巨大潜力。

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来源期刊

Journal of Central South University METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.10

自引率

6.80%

发文量

242

审稿时长

2-4 weeks

期刊介绍： Focuses on the latest research achievements in mining and metallurgy Coverage spans across materials science and engineering, metallurgical science and engineering, mineral processing, geology and mining, chemical engineering, and mechanical, electronic and information engineering