引用本文:张英杰,徐龙云,董鹏.抗坏血酸与柠檬酸对尾矿Pb污染土壤电动修复的强化效果[J].环境科学研究,2017,30(7):1138-1145.
ZHANG Yingjie,XU Longyun,DONG Peng.Electrokinetic Remediation of Pb-Contaminated Tailing Soil with Enhancing Reagents Ascorbic Acid and Citric Acid[J].Reserrch of Environmental Science,2017,30(7):1138-1145.]
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 199次   下载 271 本文二维码信息
码上扫一扫!
分享到: 微信 更多
抗坏血酸与柠檬酸对尾矿Pb污染土壤电动修复的强化效果
张英杰1,2, 徐龙云1,2, 董 鹏2,3
1.昆明理工大学材料科学与工程学院, 云南 昆明 650032 ;2.锂离子电池及材料制备技术国家地方联合工程实验室, 云南 昆明 650032 ;3.昆明理工大学冶金与能源工程学院, 云南 昆明 650032
摘要:
为研究抗坏血酸与柠檬酸作为增强试剂对高酸性缓冲能力的尾矿Pb污染土壤〔w(Pb)为(5491.9±24)mg/kg〕电动修复的强化效果,利用0.1 mol/L柠檬酸作为阴极电解液并控制阴极pH在2~3之间,系统分析土壤饱和液中c(抗坏血酸)(0~0.4 mol/L)、修复电压梯度(1~3 V/cm)对电动修复Pb污染土壤的影响,并对土壤中Pb的存在形态进行分析. 结果表明:当电动修复过程中施加电压梯度为1 V/cm、c(抗坏血酸)(0~0.4 mol/L)作为饱和液时,随着c(抗坏血酸)的增加,土壤中Pb的迁移能力随之增加,Pb的去除率得到提高. 当c(抗坏血酸)达到0.4 mol/L时,土壤中Pb的去除率为36.86%;保持c(抗坏血酸)为0.4 mol/L,当施加电压梯度由1 V/cm增至2 V/cm时,土壤中Pb的去除率得到增加(最高可达87.09%),通过Pb的形态变化可知,w(弱酸提取态Pb)由初始的2.99%(1 V/cm)最大可降至0.34%(2 V/cm),w(可还原态Pb)由初始的83.86%(1 V/cm)最大降至2.94%(2 V/cm). 研究显示,当c(抗坏血酸)为0.4 mol/L、柠檬酸(作为阴极电解液)控制阴极电解室pH在2~3之间、施加电压梯度为2 V/cm时,土壤中Pb的迁移能力显著提高并达到较好的修复效果.
关键词:  电动修复  尾矿  Pb  土壤  抗坏血酸  柠檬酸
DOI:
分类号:
基金项目:云南省环境保护专项资金项目
Electrokinetic Remediation of Pb-Contaminated Tailing Soil with Enhancing Reagents Ascorbic Acid and Citric Acid
ZHANG Yingjie1,2, XU Longyun1,2, DONG Peng2,3
1.Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650032, China ;2.National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology, Kunming 650032, China ;3.Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650032, China
Abstract:
Abstract: We systematically studied the effects of different concentrations (0-0.4 mol/L) of ascorbic acid and voltage (1-3 V/cm) on the electrokinetic remediation of Pb-contaminated tailing soil (=(5491.9±24) mg/kg) based on the enhancing reagents ascorbic acid and citric acid. The tailing soil had the property of high acid buffer capacity, and the pH of the catholyte was controlled at 2-3 in the presence of citric acid (0.1 mol/L). The results indicated that with the increase of ascorbic acid concentration (0-0.4 mol/L), the migration ability of Pb in soil increased, and the removal rate of Pb increased in the process of electric voltage gradient of 1 V/cm. The removal rate of Pb was 36.86% when the concentration of ascorbic acid in the soil increased to 0.4 mol/L. When the applied voltage gradient increased from 1 V/cm to 2 V/cm, the removal rate of Pb in soil increased to 87.09%. The morphological changes of Pb showed w(acid extractable Pb) decreased from the initial 2.99% to 0.34%, and w(reducible Pb) increased from the initial value of 83.86% to 2.94%. When ascorbic acid (as saturated liquid) concentration was 0.4 mol/L, citric acid (as cathode electrolyte) controlled the cathode chamber pH at 2-3 and the applied voltage gradient was 2 V/cm, the migration ability of Pb in soil significantly improved. Eventually, the removal efficiency of Pb in soil was more significant.
Key words:  electrokinetic remediation  tailing soil  Pb  soil  ascorbic acid  citric acid