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CMC-nZVI对高硫矿山土壤中铜的固定效果及机理 被引量:1

Immobilization of Cu in high sulfate mine soil using stabilized nonoscale zerovalent iron
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摘要 纳米零价铁(Nanoscale zero-valent iron,n ZVI)因具有较大比表面积和较强还原能力,常被用于原位修复变价重金属污染土壤,而对其应用于高硫富铜矿山土壤的修复及机理研究却鲜见报道.本研究以羧甲基纤维素-纳米零价铁(CMC-n ZVI)为供试材料,以广东省大宝山矿区高硫富铜土壤为供试土壤,按水土比1 g∶5 mL将CMC-n ZVI与矿山土壤混合均匀,通过毒性淋溶提取、重金属形态和酸可挥发性硫化物提取等实验,探究了CMC-n ZVI对矿山土壤中Cu的固定效果及机制.结果表明:(1)CMC-n ZVI对高硫土壤中的Cu具有极好的固定效果,毒性淋溶提取实验结果表明,n ZVI处理土壤中Cu的浸出浓度低于15 mg·kg^-1,达到安全标准;(2)n ZVI可促进厌氧微生物的活性,促进土壤中大量硫酸盐被还原,因此Cu可能被Fe S、Fe S2吸附或直接生成硫化物沉淀,最终固定于土壤中;(3)新生成的无定形或微晶型次级铁矿物易通过吸附或共沉淀将游离的Cu(II)固定. Due to its greater specific surface area and higher reducing ability,nano-scale zero-valent iron( n ZVI) has been commonly used for in-situ remediation of polyvalent heavy metal contaminated soils. However,its application and mechanism for the remediation of copper( Cu) and sulfate rich mine soils have been rarely reported. In this study,n ZVI was synthesized and stabilized with sodium carboxymethylcellulose( CMC). CMC-n ZVI,as well as Cu and sulfate rich soil collected from Dabao mountain mining area,Guangdong Province,were then used as experimental materials. CMC-n ZVI mixed in the 1.456‰ ethanol solution was applied to soil at a soil to solution radio of 1 g: 5 mL. By analyzing the consequence of Toxicity Characteristic Leaching Procedure( TCLP),the speciation transformation of heavy metals and the generation of acid-volatile sulfides( AVS) were studied,and the possible Cu immobilization mechanism of CMC-n ZVI in sulfate rich soil was proposed. The results showed that(1) CMC-n ZVI was markedly efficient in Cu immobilization,which was proved by the fact that Cu concentration in the TCLP leachate was reduced to meet the safety standard of 15 mg·kg^-1 after the treatment of CMC-n ZVI.(2) CMC-n ZVI could enhance the activity of anaerobic microorganisms and thus promote the reduction of sulfate,which in turn facilitated the adsorption of Cu to Fe S and Fe S2 or the formation of Cu sulfide as a precipitate.(3) the formation of amorphous or microcrystalline secondary Fe minerals could immobilize Cu by sorption and co-precipitation.
作者 陈喆 房丽莎 谭韵盈 汤叶涛 仇荣亮 CHEN Zhe1,3,FANG Lisha1,TAN Yunying1,TANG Yetao1,2,QIU Rongliang1,2(1. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275 ;2. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275;3. Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004)
出处 《环境科学学报》 CSCD 北大核心 2017年第11期4336-4343,共8页 Acta Scientiae Circumstantiae
基金 环保公益性行业科研专项(No.201509037) 广东省自然科学基金(No.2014A030313200) 广州市科技支撑项目(No.201607010065) 高校基本业务费项目(No.15lgjc36)
关键词 零价铁 高硫土壤 固定 nano-scale zero-valent iron (nZVI) sulfate rich soil copper immobilization
作者简介 陈喆(1987~),男,博士,E—mail:ldchenzhe@qq.com; 通讯作者(责任作者),E-mail:eestyt@mail.sysu.edu.cn.责任作者简介:汤叶涛(1974-),男,博士,教授,主要从事矿区及周边重金属在土壤一植物系统中的迁移、转化和积累规律研究.近年来在国内外核心刊物上发表论文60余篇.
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