铁改性膨润土活化过氧化尿素降解三氯乙烯  

Iron-modified bentonite activated urea peroxide degrades trichloroethylene

作　　者：马丽娟 令狐珊珊 潘涛 赵韬 刘邦国 陈秀荣[1] MA Li-juan;LINGHU Shan-shan;PAN Tao;ZHAO Tao;LIU Bang-guo;CHEN Xiu-rong(School of Resources and Environmental Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学资源与环境工程学院,上海200237

出　　处：《中国环境科学》2023年第5期2434-2439,共6页China Environmental Science

基　　金：国家重点研发计划(2019YFC1806104)。

摘　　要：采用浸渍法合成铁改性膨润土(FBT)活化过氧化尿素(UHP)降解三氯乙烯(TCE),优化了FBT与UHP最佳施用方式和质量配比,分析了温度对降解效果的影响;利用XPS、FTIR、SEM及TEM等手段对FBT进行表征;使用电子顺磁共振技术鉴别了主要的活性物质;结合GC-MS中间产物鉴定,推测了可能的反应路径.结果显示,干燥FBT颗粒与饱和过氧化尿素溶液混合施用时对TCE的降解效果最好,其中FBT与UHP的最优质量配比为1:1.在第24h时,FBT/UHP体系中三氯乙烯残留率约为7.4%,对比BT/UHP体系降低近40%.羟基自由基(·OH)作为主要的活性物质,对三氯乙烯降解的贡献率约88.6%.共鉴定出3种中间产物CH_(2)Cl_(2)、NH_(2)CHO、(NH_(2))_(2)CO和一种氧化最终产物CO_(2).Iron modified bentonite(FBT)was synthesized impregnation method and FBT activated urea peroxide(UHP)to degrade trichloroethylene(TCE).The optimal application method and mass ratio of FBT and UHP were optimized,and the effect of temperature on the degradation effect was analyzed.The FBT was characterized by XPS,FTIR,SEM and TEM.The main active substances were identified using electron paramagnetic resonance.Combined with the identification of intermediates by GC-MS,the possible reaction path was speculated.According to the results,TCE degradation was best when dried FBT particles were mixed with saturated urea peroxide solution.The optimal mass ratio for FBT and UHP is 1:1.After 24 hours,the residual percentage of TCE in the FBT/UHP system was about 7.4%,which was nearly 40%lower than in the BT/UHP system.As the main active substance,hydroxyl radical(·OH)contributed 88.6%to TCE degradation.Three intermediate products were identified:CH_(2)Cl_(2),NH_(2)CHO,(NH_(2))_(2)CO,and one final product of oxidation,CO_(2).

关 键 词：异味抑制 铁改性膨润土 过氧化尿素 三氯乙烯 

分 类 号：X703[环境科学与工程—环境工程]