γ-Al_2O_3催化臭氧氧化水中嗅味物质机理探讨  

Mechanism Discussion of γ-Alumina Catalyzed Ozonation for 2-Methylisoborneol Removal

作　　者：陈忠林[1] 齐飞[1] 徐冰冰[1] 沈吉敏[1] 贲岳[1] 叶苗苗[1] 

机构地区：[1]哈尔滨工业大学市政环境工程学院,哈尔滨150090

出　　处：《环境科学》2007年第3期563-568,共6页Environmental Science

基　　金：新世纪优秀人才支持计划项目(NCET-04-0321);国家自然科学基金项目(50008004)

摘　　要：以γ-Al2O3粉末为催化剂,研究催化臭氧氧化去除水体中典型嗅味物质2-甲基异茨醇(MIB)的效能与机理.结果表明,γ-Al2O3能够明显促进臭氧氧化去除MIB,表现出很好的催化活性,叔丁醇对γ-Al2O3催化氧化去除MIB过程具有明显的抑制作用.在催化臭氧氧化去除MIB过程中,γ-Al2O3表面电荷状态及表面羟基的带电性质与溶液的pH值有关.当溶液pH值与γ-Al2O3的pHzpc接近时,γ-Al2O3的催化作用最为明显.γ-Al2O3催化臭氧氧化过程中自由基的相对量值Rct比单独臭氧氧化过程高出近1个数量级,这进一步表明γ-Al2O3能明显促进臭氧分解产生更多的羟基自由基.最后还考察了不同摩尔比例的臭氧分解促进剂与抑制剂对γ-Al2O3催化臭氧分解的影响.The efficiency and mechanism in degradation of 2-methylisobomeol （MIB） as taste and odor compound in drinking water were studied under the condition where γ-alumina catalyzed ozonation. As a result, γ-alumina can behave distinct activity in enhancing the efficiency of ozonation MIB. Tert-butyl alcohol had a remarkable restrain effect on removal efficiency of catalytic ozonation MIB by γ-alumina. The surface charge status and surface hydroxyl groups status of γ- alumina and pH values of the solution can be linked together. When the pH value of solution was near the pHxpc of γ-A12O3 , there was a most observable activity in catalyzed ozonation process. Rot, which denoted the relative concentration of hydroxyl radical （· OH ）, was much higher in catalyzed ozonation process than in ozonation process. This result further illuminated that γ-A12O3 can promote ozone decomposition to produce · OH. Finally, it was investigated that the effect of rp/l on catalyzed ozone decomposition and ozone decomposition.

关 键 词：Γ-AL2O3 2-甲基异茨醇(MIB) 羟基自由基(·OH) pHxpc 表面羟基 

分 类 号：X703.1[环境科学与工程—环境工程]