文献类型：期刊文献

中文题名：NZVI@mSiO_2合成调控及有机质对其去除地下水中氯代烃影响研究

英文题名：Synthesis of NZVI@mSiO_2 and the Effects of Natural Organic Matters on the Chlorinated Hydrocarbons Removal

作者：陈帅[1];李辉[1];周礼洋[1];刘勇弟[1];任路遥[1]

机构：[1]华东理工大学资源与环境工程学院,上海200237

年份：2018

卷号：40

期号：4

起止页码：382

中文期刊名：上海理工大学学报

外文期刊名：Journal of University of Shanghai For Science and Technology

收录：Scopus;北大核心:【北大核心2017】；

基金：国家自然科学基金资助项目(51578240);中国环境科学研究院环境基准与风险评估国家重点实验室开放基金资助项目(SKLECRA2016OFP19);华东师范大学上海市城市化生态过程与生态恢复重点实验室开放课题基金资助项目(14ZZ059)

语种：中文

中文关键词：核-壳结构;纳米零价铁;悬浮稳定性;氯代烃去除

外文关键词：core-shell structure;nanoscale zero-valent iron;suspension stability;chlorinated hydrocarbons removal

摘要：考察了不同反应时间及硅源前驱体添加量对纳米零价铁@介孔氧化硅(NZVI@mSiO_2)结构的影响。采用以1,1,1-TCA为模式氯代烃的模拟污染地下水,考察了铁剂量与有机质(NOM)含量对NZVI@mSiO_2吸附去除和吸附-降解去除氯代烃行为的影响。结果表明:加入正硅酸乙酯(TEOS)后,以300 r/min速度搅拌4 h便可获得结构稳定的NZVI@mSiO_2;不同TEOS添加量可调控NZVI@mSiO_2的mSiO_2壳层厚度;铁剂量的升高促进NZVI@mSiO_2对1,1,1-TCA的吸附-降解去除;NOM通过吸附桥连和网捕卷扫作用降低mSiO_2悬浮液的稳定性,但因其引入的新的吸附位点及降低体系pH,从而促进对氯代烃的吸附去除与吸附-降解去除。
Nanoscale zerovalent iron@mesoporous silica(NZVI@mSi02)can effectively remove chlorinated hydrocarbons in groundwater.The effects of the reaction time after adding silicon source and the amount of silicon source added in the structure of NZVI@mSi02 were studied.1,1,1-TCA was used as a model chlorinated hydrocarbon to study the effects of NZVI@mSi02 amount and natural organic matter(NOM)on the removal of chlorinated hydrocarbons via the adsorption and adsorption-degradation by NZVI@mSi〇2.The results show:the stable structure of NZVI@mSi02 can be obtained after adding tetraethoxysilane(TEOS)and stirring at 300 r/min for 4 h;the thickness of the mSi02 shell can be controlled by adding different amount of TEOS;higher NZVI@mSi02 dosage provides more active sites for the reaction,which is beneficial to the removal of chlorinated hydrocarbons via the adsorption-degradation;NOM can reduce the stability of mSi02 suspension through bridging and trapping mSi02 particles,while the introduced new sites and the reduced pH value of the solution finally promote the removal of chlorinated hydrocarbons via the adsorption and adsorption-degradation.