甲醛在光催化降解反应中自由基中间体的电子顺磁共振研究  

Investigation of Free Radical Intermediates of Formaldehyde Photocatalytic Degradation by Electron Paramagnetic Resonance

作　　者：陈扬[1] 齐奉明[1] 杨超[1] 叶为春[1] 王春明[1] 

机构地区：[1]兰州大学化学化工学院,兰州730000

出　　处：《化学学报》2009年第7期671-674,共4页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20577017)资助项目.

摘　　要：以纳米二氧化钛(TiO2)光催化降解甲醛,使用2-甲基-2-亚硝基丙烷(2-methyl-2-nitroso-propane,MNP)作为自旋捕截剂(spintrap,ST),研究了反应过程中的自由基中间体,得到了一种新的自旋加合物(spinadduct,ST-R).电子顺磁共振(Electron Paramagnetic Resonance,EPR)的结果表明,甲醛在水溶液中降解的反应中间体为?CH(OH)2,并提出了一种新的降解机理.Formaldehyde was degraded with photo-catalysis by nano-titanium dioxide （TiO2） and 2-methyl- 2-nitro-propane （MNP） was used as a spin trap （ST）. The radical intermediates in the process of reaction were studied and a new spin adduct （ST-R） was obtained. The results of electron paramagnetic resonance （EPR） indicated that the intermediate of formaldehyde degradation in aqueous solution was ,CH（OH）2. A new degradation mechanism was proposed.

关 键 词：纳米二氧化钛(TiO2) 甲醛 光催化降解 电子顺磁共振(EPR) 

分 类 号：O643.32[理学—物理化学]