多硫化物修饰nZVI@BC对污染土壤中铬的稳定化:铬的生物可用性和稳定机制
Chromium stabilization by polysulfide supported nZVI@biochar in contaminated soil:Cr bioavailability and stabilization mechanism
陈劲松 1王鑫 1晏鑫尧 1王晓科 1马慧 1蒲生彦2
作者信息
- 1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China;State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil&Water Pollution,Chengdu University of Technology,Chengdu 610059,China
- 2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China;State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil&Water Pollution,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China
- 折叠
摘要
土壤中铬(Cr)污染是最严重的环境问题之一,对人类健康构成了重大威胁.本研究探讨了多硫化物修饰的nZVI@BC(PS-nZVI@BC)对铬污染土壤的稳定化机制以及铬的生物可用性.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Cr(Ⅵ).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态.稳定机制包括静电吸附、氧化还原反应、表面络合和沉淀.此外,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.这些结果表明采用PS-nZVI@BC对受铬污染的土壤进行修复具有巨大的潜力.
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.
关键词
铬污染土壤/生物炭/多硫化物修饰nZVI/土壤修复/土壤肥力Key words
Cr-contaminated soil/biochar/polysulfide supported nZVI/soil remediation/soil fertility引用本文复制引用
基金项目
国家自然科学基金(42077185)
国家自然科学基金(U22A20591)
Sichuan Science and Technology Program for Distinguished Young Scholars,China(2022JDJQ0010)
Sichuan Science and Technology Program for Distinguished Young Scholars,China(2022ZYD0040)
国家重点研发计划(2020YFC1808300)
Research Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,China(SKLGP2020Z002)
出版年
2024
NETL
NSTL
万方数据