小分子有机酸对纳米零价铁还原脱氯4\|氯联苯的影响

浙江农业学报

小分子有机酸对纳米零价铁还原脱氯4\|氯联苯的影响

（1 南京农业大学理学院，江苏南京 210095；2 中国科学院南京土壤研究所，土壤环境与污染修复重点实验室，江苏南京 210008；3 环境保护部南京环境科学研究所，江苏南京 210042；4 环境保护部有机食品发展中心，江苏南京 210042）

出版日期:2015-08-25 发布日期:2015-08-21

Impact of low\|molecular weight organic acids on dechlorination of 4\|ClBP by nanoscale zero\|valent iron#br#

（1 College of Science， Nanjing Agricultural University， Nanjing 210095， China; 2 Key Laboratory of Soil Environment and Pollution Remediation， Institute of Soil Science， Chinese Academy of Sciences， Nanjing 210008， China; 3 Nanjing Institute of Environmental Sciences， Ministry of Environmental Protection， Nanjing 210042， China; 4 Organic Food Development Center， Ministry of Environmental Protection， Nanjing 210042， China）

Online:2015-08-25 Published:2015-08-21

摘要/Abstract

摘要： 选取土壤中大量存在的可溶性有机质（DOM）作为试验对象，研究其对纳米零价铁（NZVI）降解4\|氯联苯（4\|ClBP）的影响。结果表明：初始pH为40时，作为对照体系，反应96 h，NZVI对水相中4\|ClBP的还原脱氯效率为650%，去除率为740%；而分别添加水杨酸（SA）、单宁酸（TA）和没食子酸（GA）的体系中，NZVI对4\|ClBP的还原脱氯效率分别降至540%，612%和546%，去除率分别降至699%，708和695%。添加SA显著抑制了纳米零价铁对4\|ClBP的还原脱氯效率。在上述4种反应体系中，溶液pH值均呈现先快速升高然后达到平衡的趋势。

关键词: 多氯联苯, 纳米零价铁, 还原脱氯, 去除率, 小分子有机酸

Abstract: Nanoscale zero\|valent iron （NZVI） has been used to reduce polychlorinated biphenyls （PCBs）. However， the effect of dissolved organic matter （DOM） on the dechlorination of PCBs was not well recognized. This study examined the effect of three low weight molecule organic acids， including salicylic acid （SA）， tannic acid （TA） and gallic acid （GA）， which are widely present in soil， on the dechlorination and removal efficiency of 4\|ClBP by NZVI. After 96 h reaction， the dechlorination efficiency of 4\|ClBP by NZVI was 650%， and the removal efficiency was 740%. The dechlorination and removal efficiency of 4\|ClBP were 540% and 699% with SA， 612% and 708% with TA， and 546% and 695% with GA， respectively. The addition of SA inhibited the reduction of 4\|ClBP by NZVI. And in these four reaction system， pH increased rapidly firstly and then reached equilibrium quickly.

Key words: polychlorinated biphenyls, nanoscale zero\, valent iron, dechlorination, removal rate, low\, molecular weight organic acids

柳林浩1，2，汪玉2，李国华1，方国东2，王磊3，4，*. 小分子有机酸对纳米零价铁还原脱氯4\|氯联苯的影响[J]. 浙江农业学报.