文献类型：期刊文献

中文题名：有机膨润土负载纳米零价铁去除废水中的四氯乙烯研究

英文题名：Remove of perchloroethylene in wastewater by organobentonite-supported nanoscale zero-valent iron

作者：程伟[1,2];盛国栋[2];刘进军[1];李益民[2]

机构：[1]宁波大学材料科学与化学工程学院;[2]绍兴文理学院化学化工学院

年份：2015

卷号：15

期号：6

起止页码：228

中文期刊名：安全与环境学报

外文期刊名：Journal of Safety and Environment

收录：CSTPCD、、北大核心2014、CSCD2015_2016、北大核心、CSCD

基金：国家自然科学基金项目(21177088)

语种：中文

中文关键词：环境工程学;有机膨润土;纳米零价铁;四氯乙烯

外文关键词：environmental engineering; organobentonite; nanoscale zero-valent iron; perchloroethylene

中文摘要：用具有良好吸附能力的有机膨润土作载体,通过FeSO_4与NaBH_4也反应制得有机膨润土负载纳米零价铁(NZVI/CTMA-Bent)。用XRD、TEM对NZVI/CTMA-Bent进行了表征,并将NZVI/CTMA-Bent用于四氯乙烯(PCE)的去除,考察了介质pH值、PCE初始质量浓度对其去除率的影响,并与相同铁含量的纳米零价铁(NZVI)进行了比较,测定反应中Cl^-浓度的变化,采用GC/MS方法对反应产物进行了分析。结果表明:以有机膨润土作载体,可有效阻止NZVI的团聚,且对介质pH值有一定的缓冲作用;NZVI/CTMA-Bent与PCE反应120 min后,去除率接近100%,既高于相同铁含量的NZVI对PCE的去除率(54.8%),也优于NZVI和有机膨润土对PCE去除率的加和(86.5%);NZVI/CTMA-Bent与PCE反应几乎完全转变成乙烯。动力学研究表明,NZVI/CTMA-Bent、NZVI对PCE的反应均符合Langmuir-Hinshelwood方程,且反应速率与其对PCE的吸附性能呈正相关。

外文摘要：This paper aims to report our investigation findings of the enhanced removal of perchloroethylene（PCE） by a novel composite,namely,nanoscale zero-valent iron immobilized on the organobentonite（NZVI/CTMA-Bent）.For this purpose,first of all,we have prepared the nanoscale zero-valent iron（NZVI） supported on organobentonite（CTMA-Bent） with good adsorption capacity as the support through the reduction reaction of NaBH_4 and FeSO_4.And,then,we have analyzed the characteristics of the phrase structure and morphology of the supported NZVI/CTMA-Bent via the X-ray diffraction（XRD） and transmission electronic microscope（TEM）.Furthermore,we used the supported NZVI/CTMA-Bent for the reductive removal of perchloroethylene（PCE） in wastewater and investigated the effects of pH and initial PCE concentration on the removal efficiency of PCE.Finally,we compared the removal efficiency of PCE by NZVI/CTMA-Bent with that of bare NZVI with the same iron content,we also determined the variation of chloride ion concentrations during reaction,and analysed the the reaction products of PCE with a gas chromatograph-mass spectrometer（GC/MS）.The results of our analysis showed that CTMA-Bent as the support can effectively prevent the aggregation of NZVI and have a buffering effect for the medium pH.Under the same experimental condition,the removal efficiency of PCE by NZVI/CTMA-Bent reached 100%after 120 min.It was not only much higher than that（54.8%） of NZVI containing the same iron content,but also superior to the sum of the removal（86.5%）by NZVI containing the same iron content and adsorption by organobentonite containing the same clay content with NZVI/CTMABent,respectively.This indicates the good synergetic effect between CTMA-Bent adsorption and NZVI reduction.NZVI/CTMA-Bent can rapidly and almost completely dechlorinate PCE to ethylene.The kinetic studies indicate that the reaction kinetics of PCE by NZVI or NZVI/CTMA-Bent can be fitted well to the Langmuir-Hinshelwood model.Furthermore,the reaction rate of PCE by NZVI or NZVI/CTMA-Bent was positively related to the adsorption performance.