Fe-MCM-41改性及其催化过硫酸盐对地下水中恩诺沙星去除效果  

Fe-MCM-41 modification and its catalytic persulfate removal effect on enrofloxacin from groundwater

作　　者：赵凯 孟宪荣[2] 余浪 武冕 许伟[2] 滕振兴 刘阳 施维林[1] ZHAO Kai;MENG Xianrong;YU Lang;WU Mian;XU Wei;TENG Zhenxing;LIU Yang;SHI Weilin(College of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009;Suzhou Institute of Environmental Sciences,Suzhou 215009;Suzhou Yifante Environmental Remediation Co.Ltd.,Suzhou 215100)

机构地区：[1]苏州科技大学环境科学与工程学院,苏州215009 [2]苏州市环境科学研究所,苏州215009 [3]苏州逸凡特环境修复有限公司,苏州215100

出　　处：《环境科学学报》2025年第2期59-68,共10页Acta Scientiae Circumstantiae

基　　金：苏州市社会发展科技创新面上项目(No.2022SS16)。

摘　　要：以十六烷基三甲基溴化铵(CTAB)为模板剂,正硅酸乙酯(TEOS)为硅源,FeSO_(4)·7H_(2)O为铁源,通过水热合成法制备Fe-MCM-41,并通过引入均三甲苯(TMB)和葡萄籽提取物(GSE)制备获得扩孔Fe-MCM-41(KFe-MCM-41)和改性GSE@Fe-MCM-41.采用SEM、TEM、BET、FTIR、XRD等手段对材料进行结构表征,并研究材料催化过硫酸盐(PDS)对地下水中恩诺沙星(ENR)的去除效果及机理.实验结果表明:扩孔和GSE改性均未改变Fe-MCM-41有序六方介孔结构,均明显提高了其催化PDS降解ENR的效果,相比于Fe-MCM-41,KFe-MCM-41和GSE@Fe-MCM-41催化PDS对ENR的降解去除率分别提升了21.70%和28.37%.KFe-MCM-41孔径较Fe-MCM-41提升了13.48%,扩孔成功.材料合成时,TMB、GSE与TEOS最佳质量比分别为1∶3和1∶100.KFe-MCM-41和GSE@Fe-MCM-41与PDS最佳投加质量比均为1∶1,此时ENR去除效率最高.自由基猝灭实验表明,ENR降解过程中存在•OH、O_(2)•-和^(1)O_(2)等多种活性物种,扩孔改性和GSE改性均促进了催化降解过程中单线态氧的生成,反应过程中非自由基机制增加,提升了催化降解反应的抗干扰性,有利于对复杂地下水中ENR等有机污染物的降解去除.Fe-MCM-41 was prepared by hydrothermal synthesis using cetyltrimethylammonium bromide(CTAB)as the template,ethyl orthosilicate(TEOS)as the silicon source,and FeSO_(4)·7H_(2)O as the iron source,then the reamed Fe-MCM-41(KFe-MCM-41)and modified GSE@Fe-MCM-41 were obtained by introducing trimethylbenzene(TMB)and grape seed extract(GSE).The structure of the above materials were characterized by means of scanning electron microscope(SEM),Transmission electron microscopy(TEM),Brunauer-Emmett-Teller(BET),flight test instrumentation requirements(FTIR),X-ray diffraction(XRD)and other methods.Then the removal effect and the mechanism of the material-catalyzed persulfate(PDS)on enrofloxacin(ENR)in groundwater were studied.The experimental results showed that the reaming and GSE modification did not change the ordered hexagonal mesoporous structure of Fe-MCM-41,but significantly improved the effect of catalyzing PDS to degrade ENR.In addition,for the synthesized materials,the best mass ratios of TMB,GSE and TEOS were 1∶3 and 1∶100,respectively.The optimal dosing mass ratio of KFe-MCM-41 and GSE@Fe-MCM-41 to PDS was 1∶1,and the removal efficiency of ENR was the highest.Moreover,compared with Fe-MCM-41,the degradation and removal rates of ENR using PDS catalyzed by KFe-MCM-41 and GSE@Fe-MCM-41 were increased by 21.70%and 28.37%,respectively.The pore diameter of KFe-MCM-41 was increased by 13.48%also,indicating the hole reaming was successful.The free radical quenching experiment showed that there were a variety of active species such as•OH,O_(2)•-and^(1)O_(2)in the degradation process of ENR,and the reaming pore modification and GSE modification promoted the formation of singlet oxygen in the catalytic degradation process.The non-free radical mechanism increased during the reaction process,which improved the anti-interference of the catalytic degradation reaction,and was conducive to the degradation and removal of organic pollutants such as ENR in complex groundwater.

关 键 词：Fe-MCM-41 扩孔 过硫酸盐 高级氧化技术 恩诺沙星 

分 类 号：X523[环境科学与工程—环境工程]