巯基丙基三甲氧基硅烷改性煤矸石修复钴污染土壤的性能

The remediation of cobalt⁃contaminated soil using coal gangue modified by mercaptopropyltrimethoxysilane

随着工业的不断发展,土地资源不断遭到破坏,全球多数钴(Co)污染地区均处于中、高度污染水平,高浓度的Co会对人体健康和动植物造成危害.对土壤中生物可利用态Co进行钝化处理是降低Co污染危害的有效手段之一.本文采用巯基丙基三甲氧基硅烷改性煤矸石为修复剂,探究了不同修复剂添加量、pH、含水率、修复时间对4个模拟Co污染土壤样品中Co的钝化效果.结果表明:修复剂添加量为6%~8%、土壤含水率为45%~55%时,巯基改性煤矸石对土壤中Co具有最佳的钝化效果,钝化作用在14 d后达到稳定,钝化率约为86%,土壤pH对巯基改性煤矸石钝化Co的作用影响不明显.

With the continuous development of industry,the land resource is suffering serious destruction.Most of the cobalt(Co)⁃contaminated soils in the world are at medium or high pollution levels.The high content of Co will cause serious harms to human,animals and plants.The passivation of the bioavailable Co in contaminated soil is an efficient approach to reduce the harm from polluted Co.In this work,using coal gangue modified by mercaptopropyltrimethoxysilane as remediation agent,the factors that affect the passivation of cobalt(Co)in four simulative Co⁃contaminated soil,like the dosage of remediation agent,pH and moisture content of soil,and remediation time,was discussed.The results indicate 6%~8%of the dosage of remediation agent and 45%~55%of the moisture content of soil are the best passivation conditions.The passivation becomes stable after 14 d treatment,at which the passivation rate reached ca.86%.The pH of soil displays a negligible effect on the passivation performance of the remediation agent.