UV/Fe^(0)/H_(2)O_(2)降解乙苯气体的工艺研究  

Process study on degradation of gaseous ethylbenzene by UV/Fe^(0)/H_(2)O_(2)

作　　者：孙彦琛 郭巍巍[1,2] 王振 杨耀党[2] 孔庆端 万俊锋 王岩[1] SUN Yan-chen;GUO Wei-wei;WANG Zhen;YANG Yao-dang;KONG Qing-duan;WAN Jun-feng;WANG Yan(School of Ecology and Environment,Zhengzhou University,Zhengzhou 450001,China;Henan Xinanli Security Technology Co.,Ltd.,Zhengzhou 450001,China)

机构地区：[1]郑州大学生态与环境学院,河南郑州450001 [2]河南鑫安利安全科技股份有限公司,河南郑州450001

出　　处：《应用化工》2023年第12期3257-3260,3264,共5页Applied Chemical Industry

基　　金：国家自然科学基金(51906226)。

摘　　要：以零价铁(Fe^(0))代替Fe^(2+)作Fenton试剂催化剂,考察H_(2)O_(2)浓度、[H_(2)O_(2)]/[Fe^(0)]摩尔比和pH值对UV/Fe^(0)/H_(2)O_(2)技术降解乙苯气体的影响,分析了反应过程中H_(2)O_(2)和铁物质的浓度变化,通过GC-MS检测不同时间段的液体中间产物。结果表明,以48μm工业级Fe^(0)作催化剂,在H_(2)O_(2)浓度为100 mmol/L、[H_(2)O_(2)]/[Fe^(0)]摩尔比为40和pH值为3的优化条件下,UV 365/Fe^(0)/H_(2)O_(2)体系中乙苯气体降解率在45 min内达到67.5%。检测到不同时间段的液体中间产物,如甲苯、苯乙醇、苯乙酮、苯甲醛、正丙醇和丁烯酮等,没有气体中间产物产生。45 min后,H_(2)O_(2)浓度不足,导致降解率降低,稳定体系内H_(2)O_(2)浓度,能够长期高效地降解乙苯气体,Fe^(0)连续浸出Fe^(2+),确保UV 365/Fe^(0)/H_(2)O_(2)体系良好的铁循环性能。The zero-valent iron(Fe^(0))as the catalyst of the Fenton reaction instead of Fe^(2+).The catalytic capacity of UV/Fe^(0)/H_(2)O_(2)system was evaluated by the degradation of gaseous ethylbenzene.Considering the complexity of actual reaction,various factors on the degradation efficiency were inquired systematically in this work such as initial H_(2)O_(2)concentration,pH and[H_(2)O_(2)/Fe^(0)]molar ratio.The changes in concentration of H_(2)O_(2)and iron substance were analyzed thoroughly in the degradation process.Simultaneously,the GC-MS was conducted to study the intermediate adducts in the solution at different reaction phases.The result showed that the 48μm industrial grade Fe^(0)was served as the catalyst.The removal efficiency of gaseous ethylbenzene in UV 365/Fe^(0)/H_(2)O_(2)system could reach 67.5%within 45 min when 100 mmol/L H_(2)O_(2)was introduced,and the molar ratio of[H_(2)O_(2)]/[Fe^(0)],initial pH value were adjusted to 40 and 3,respectively.Liquid intermediates were detected in different time periods,such as toluene,phenethyl alcohol,acetophenone,benzaldehyde,1-propanol and methyl vinyl ketone,and no gaseous intermediates were detected.Moreover,the insufficient concentration of H_(2)O_(2)after 45 min reduced the removal efficiency,and the stable concentration of H_(2)O_(2)in the system could degrade ethylbenzene gas efficiently for a long time.Continuous leaching of Fe^(2+)from Fe^(0)could enable excellent iron cycling performance in this reaction system.

关 键 词：乙苯气体 芬顿反应 紫外光 零价铁 降解工艺 机理研究 

分 类 号：TQ209[化学工程—有机化工] X511[环境科学与工程—环境工程]