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Publication Detail
Enhanced photocatalytic activity of nc-TiO2by promoting photogenerated electrons captured by the adsorbed oxygen
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Cao Y, Jing L, Shi X, Luan Y, Durrant JR, Tang J, Fu H
  • Publication date:
  • Pagination:
    8530, 8536
  • Journal:
    Physical Chemistry Chemical Physics
  • Volume:
  • Issue:
  • Status:
  • Print ISSN:
Nanocrystalline TiO 2 (nc-TiO 2 ) was modified by a simple post treatment with monometallic sodium orthophosphate solution. It is shown that the surface modification with an appropriate amount of phosphate obviously enhances the surface photovoltage responses of nc-TiO 2 in the presence of O 2 , clearly indicating that the separation of photogenerated charges is greatly improved by promoting the photoelectrons captured by the adsorbed O 2 . This is well responsible for its much high photocatalytic activity for degrading representative gas-phase acetaldehyde, liquid-phase phenol and rhodamine B of phosphate-modified nc-TiO 2 , compared with the unmodified nc-TiO 2 . Moreover, it is demonstrated that the amount of O 2 adsorbed on the surfaces of nc-TiO 2 is greatly increased after phosphate modification based on the O 2 temperature programmed desorption curves, which is attributed to the substitution of -Ti-OH with -Ti-O-P-OH. It is suggested for the first time that the phosphate modification favors the O 2 adsorbed on TiO 2 so as to further promote the photogenerated electrons captured. This work would provide feasible routes to further improve the photocatalytic performance for degrading pollutants of oxide-based semiconductors. This journal is © the Owner Societies 2012.
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