摘要
电动修复法作为土壤重金属污染的有效修复方法,成为研究热点。目前影响土壤电动修复效率的因素很多,包括土壤类型、污染物性质、电压和电流大小、电极材料和结构等,但很少有文献报道电极材料对电动修复土壤重金属污染的效率影响。本作品采用不同电极材料(石墨、不锈钢和钛板)对尾矿附近重金属镉污染的土壤进行电动修复,研究了修复效率及土壤pH随时间的变化情况。当电场强度为1 V/cm,采用石墨电极电动修复土壤48 h总镉的去除效率为73%,不锈钢电极和钛电极的修复效率分别为44%和40%。石墨电极修复效率的提高归因于相比于不锈钢电极和钛电极,石墨电极提供更多的电子传递所需的活性界面。
Electrokinetic remediation considered as an effective remediation of heavy metal contaminated soil remediation is studied widely. To enhance the EK remediation, many factors should be considered. First of all, it is important to select a good electrode material to increase the active sites because the electrode directly interacts with the soil to carry heavy metals out into the pore solution. Therefore, the electrode material is related to the efficiency of EK remediation. In this work, the effects of three different electrode materials （graphite, stainless steel, titanium plate） on the removal of Cadmium-contaminated soil near a mine tailing by EK remediation were studied in detail, with the purpose of improving the efficiency of EK remediation. The variations in removal efficiency and soil pH with treatment time were determined. The removal efficiency of Cadmium reached a maximum of 73 % when using a voltage gradient of 1 V/cm and a treatment time 48 h with the graphite electrode. When using a stainless steel electrode, Cadmium removal efficiency was 44 %, and 40 % of total Cd could be removed with a titanium plate electrode. The improved removal efficiency was attributed to the more active sites for transfer of electrons provided by the graphite electrode, compared to the stainless steel and titanium plate electrode.
出处
《广东化工》
CAS
2017年第7期205-207,共3页
Guangdong Chemical Industry
基金
"攀登计划"2017年广东省大学生科技创新培育专项资金(项目编号pdjh2017b0675)
广东省高等职业教育品牌专业建设项目:室内环境检测与控制技术专业(项目编号2016gzpp036)
关键词
电动修复
电极材料
镉
土壤
electrokinetic remediation
electrode material
Cd
soil
