Acta Chimica Sinica ›› 2009, Vol. 67 ›› Issue (7): 671-674. Previous Articles     Next Articles

Original Articles

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

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)