Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2006, Vol. 27 ›› Issue (10): 853-856.

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Reaction Mechanisms for Gas-Phase Photocatalytic Degradation of Benzene and Butyraldehyde over TiO2/AC Composite Photocatalyst

ZHANG Jianchen1*, GUO Kunmin2, MA Lan2, ZHAO Hongyang2   

  1. 1 Department of Chemical Defense, Institute of Chemical Defense,The Chinese People's Liberation Army, Beijing 102205, China;2 The First Graduate School, Research Institute of Chemical Defense, The Chinese People's Liberation Army, Beijing 100083, China
  • Received:2006-10-25 Online:2006-10-25 Published:2010-11-28

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Abstract: The TiO2 photocatalyst and TiO2/AC composite photocatalyst were prepared by sol-gel and hydrothermal treatment methods. In a static photocatalytic reactor, the gas-phase adsorption and photocatalytic degradation of benzene and butyraldehyde over the two photocatalysts were studied, and the intermediates and products were detected by gas chromatography. The TiO2/AC composite photocatalyst had stronger adsorption capability and higher photocatalytic activity than the TiO2 photocatalyst. The intermediates and products were the same over TiO2 and TiO2/AC, which indicated that the photocatalytic degradation of benzene (or butyraldehyde) over the two catalysts followed the same mechanism. The possible photocatalytic oxidation pathways were discussed.

Key words: titania, activated carbon, photocatalyst, benzene, butyraldehyde, degradation, reaction mechanism