化学学报 ›› 2009, Vol. 67 ›› Issue (7): 671-674. 上一篇    下一篇

研究论文

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

陈 扬 齐奉明 杨 超 叶为春 王春明*

  

  1. (兰州大学化学化工学院 兰州 730000)

  • 收稿日期:2008-08-02 修回日期:2008-12-18 出版日期:2009-04-14 发布日期:2009-04-14
  • 通讯作者: 王春明

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

Chen, Yang Qi, Fengming Yang, Chao Ye, Weichun Wang, Chunming*   

  1. (Department of Chemistry, Lanzhou University, Lanzhou 730000)
  • Received:2008-08-02 Revised:2008-12-18 Online:2009-04-14 Published:2009-04-14
  • Contact: Wang, Chunming

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(spin trap, 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(spin adduct, 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.

关键词: 纳米二氧化钛(TiO2), 甲醛, 光催化降解, 电子顺磁共振(EPR)

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.

Key words: nano-TiO2, formaldehyde, photocatalysis degradation, electron paramagnetic resonance (EPR)