柠檬酸淋洗去除电子垃圾污染土壤中的重金属  

Removal of Heavy Metals from Electronic Waste Contaminated Soil by Washing with Citric Acid

作　　者：邢宇[1] 党志[1,2] 孙贝丽[1] 卢桂宁[1,2] 郭楚玲[1,2] 

机构地区：[1]华南理工大学环境与能源学院,广东广州510006 [2]华南理工大学工业聚集区污染控制与生态修复教育部重点实验室,广东广州510006

出　　处：《化工环保》2014年第2期110-113,共4页Environmental Protection of Chemical Industry

基　　金：国家高新技术发展研究计划项目(2012AA06A203);教育部新世纪优秀人才项目(NCET-12-0199);广东省自然科学基金团队项目(9351064101000001);广州市珠江科技新星项目(2013J2200007)

摘　　要：采用柠檬酸溶液对模拟电子垃圾污染土壤(简称污染土壤)中Cu,Pb,Cd 3种重金属进行淋洗实验,考察了柠檬酸溶液的浓度、柠檬酸溶液的pH、淋洗时间等对污染土壤中Cu,Pb,Cd的淋洗效果,探讨了柠檬酸溶液淋洗前后污染土壤中Cu,Pb,Cd 3种重金属各形态含量的变化。研究结果表明,在柠檬酸溶液的浓度0.100 mol/L、柠檬酸溶液的pH 5、淋洗时间1 440min的适宜条件下,对污染土壤中Cu,Pb,Cd的去除率分别达到89.37%,72.11%,86.39%。柠檬酸溶液对3种重金属的去除主要是通过洗出酸可提取态(R1)和酸可还原态(R2)来实现的,每种重金属的R1和R2之和均占到其淋出总量的95%以上,而酸可氧化态(R3)和残渣态(R4)的含量淋洗前后基本无变化。Cu,Pb and Cd in the simulated electronic waste contaminated soil were washed out using citric acid solution.The factors affecting the washing effect were investigated and the content change of each metal form after washing was studied.The research results show that under the conditions of citric acid solution concentration 0.100 mol/L,citric acid solution pH 5 and washing time 1 440 min,the removal rates of Cu,Pb and Cd are 89.37％,72.11％ and 86.39％ respectively.The removal of the heavy metals is mainly achieved by washing out the extractable form （R1） and the reducible form （R2） of the heavy metals,the sum of R1 and R2 can reach to 95％ of the total wash-out amount of each heavy metal,while the contents of the oxidable form （R3） and the residual form （R4） are almost unchanged after washing.

关 键 词：柠檬酸 重金属污染 土壤淋洗 电子垃圾 

分 类 号：TQ116.2[化学工程—无机化工]