文献类型：期刊文献

中文题名：基于蛋黄-蛋壳结构的Fe/FeS@SiO^2材料去除水中三氯乙烯

英文题名：Removal of trichloroethylene from water using yolk-shell Fe/FeS@SiO^2 particles

作者：任路遥[1];陈帅[2];刘勇弟[1];李辉[1,3]

机构：[1]华东理工大学资源与环境工程学院,国家环境保护化工过程环境风险评价与控制重点实验室,上海200237;[2]上海第二工业大学环境与材料工程学院,资源循环科学与工程中心,上海201209;[3]上海大学环境与化学工程学院,环境污染与健康研究所,上海200344

年份：2019

卷号：13

期号：11

起止页码：2537

中文期刊名：环境工程学报

外文期刊名：Chinese Journal of Environmental Engineering

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：上海市学术/技术研究带头人项目(18XD1424100);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(SKLECRA2016OFP19);霍英东教育基金会(141077);上海市教委创新计划(14ZZ059);国家自然科学基金资助项目(41877377,51578240).

语种：中文

中文关键词：TCE去除;硫化纳米零价铁(Fe/FeS);团聚;Fe/FeS@SiO^2材料;中空介孔氧化硅球

外文关键词：TCE removal;sulfurized nano-zero-valent iron(Fe/FeS);agglomeration;Fe/FeS@SiO^2 yolk-shell particles;hollow mesoporous silica spheres

摘要：针对硫化纳米零价铁(Fe/FeS)颗粒间的团聚以及环境适应性差的问题,用正硅酸乙酯(TEOS)为原料制备中空介孔氧化硅球,再通过化学反应在壳内形成大尺寸核的方法制备具有蛋黄-蛋壳结构的Fe/FeS@SiO^2材料以防止Fe/FeS的团聚并提高其活性,并将该材料用于三氯乙烯(TCE)的去除中;采用SEM和TEM观察、红外线光谱分析(FTIR)、X射线衍射分析(XRD)、X射线光电子能谱分析(XPS)等分析方法对材料进行了表征。结果表明,在Fe/FeS@SiO^2材料还原降解TCE的实验中,Fe/FeS@SiO^2去除TCE的最佳铁与硫的摩尔比(铁硫比)为30,并且在TCE初始浓度10 mg·L^-1溶液中投加含有0.1 g Fe^0、铁硫比为30的Fe/FeS@SiO^2材料下,反应180 min后,TCE的去除率为90.75%,与未包裹氧化硅壳时的去除率(66.06%)相比,去除效果明显提高。介孔氧化硅壳阻止了Fe/FeS的团聚,其表面上的孔道使得材料具有更大的比表面积,加强了对TCE的吸附,同时材料中的空腔使得核与污染物的接触增加,提高了TCE的去除率。表征结果表明,Fe/FeS@SiO^2材料具有特殊的结构,包括中心核、空腔以及介孔壳,可以防止Fe/FeS的团聚。
Aiming at the agglomeration of sulfurized nano-zero-valent iron(Fe/FeS)due to its interaction between particles and poor environmental adaptability,the hollow mesoporous silica spheres were prepared by using tetraethyl orthosilicate(TEOS)as the silicon source,and then the Fe/FeS@SiO^2 material with yolk-shell structure was prepared by"ship-in-a-bottle"method to prevent the agglomeration of Fe/FeS and improve its activity,which was used to remove trichloroethylene(TCE).Scanning electron microscopy(SEM),transmission electron microscopy(TEM),Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction analysis(XRD)and X-ray photoelectron spectroscopy(XPS)were employed to characterize above materials.The characterization results revealled that the Fe/FeS@SiO^2 yolk-shell particles had special structures,including active cores,mesoporous shells and hollow cavities,which could prevent the agglomeration of Fe/FeS.The experimental results showed that the optimum mass ratio of Fe to S for Fe/FeS@SiO^2 preparation was 30.At TCE initial concentration of 10 mg·L^-1,Fe dosage of 0.1 g and reaction time of 180 min,the TCE removal efficiency reached 90.75%,which was significantly higher than that of Fe/FeS(66.06%).The mesoporous silica shell inhibited the agglomeration of Fe/FeS,and the pores in the shell provide a larger specific surface area for the Fe/FeS@SiO^2 yolk-shell particles,which enhances the TCE adsorption.Moreover,the cavity in the material could strengthen the contact between the cores and the contaminants,which improved the TCE removal efficiency.