Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (03): 278-281.doi: 10.3866/PKU.WHXB20010320

• ARTICLE • Previous Articles     Next Articles

Mechnism of Photocatalytic Oxidation of Formaldehyde

Yang Jian-Jun;Li Dong-Xu;Li Qing-Lin;Zhang Zhi-Jun;Wang Han-Qing   

  1. Lanzhou Institute of Chemical Physics,Chinese Academy of Science,Lanzhou　730000;Key Lab of Lubrication and Functional Materials,Henan University,Kaifeng　475001
  • Received:2000-10-08 Revised:2000-11-21 Published:2001-03-15
  • Contact: Li Qing-Lin E-mail:qlli01@371.net

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Abstract: The adsorption state of reactants,free radical intermediates and the r eaction mechanism have been studied by means of temperature programmed descripti on (TPD),electron spin resonance (ESR) and spin trapingESR in the photocatalyt ic oxidation of formaldehyde.The results showed that O2 adsorbed on the surface of photocatalyst could be reduced to •O－2 by photogenerated electrons and H2O could be oxidized to •OH by holes.Both free radicals are active oxidants in the reaction of photocatalytic oxidation of HCHO.The photocatalytic oxidation of HC HO carried out with two steps.Firstly,HCHO was oxidized into HCOOH,then HCOOH co nverted into final product of CO2 and H2O.

Key words: Formaldehyde, Photocatalytic oxidation, Temperature programmed deso rption, Electron spin resonance