[Photocatalytic degradation of bromomethane on sol-gel-derived SO4(2-)/TiO2].
SO4(2-)/TiO2 photocatalysts were prepared by sol-gel method and characterized by X-ray diffraction (XRD), FTIR spectroscopy and N2 sorption analysis applying BET method. Photocatalytic decomposition of CH3Br in air stream was studied over SO4(2-)/TiO2 photocatalysts under the different reaction conditions. The results showed that the addition of SO4(2-) to TiO2 greatly enhanced its structural and photocatalytic properties. The optimum concentration of SO4(2-) on TiO2 was 9% wt and the best calcination temperature was 450 degrees C. Moreover, the sulfated TiO2(SO4(2-)/TiO2) exhibited excellent stability of activity under the moist reaction condition. When the reaction temperature was below 85 degrees C, the reactivity of bromomethane was enhanced with increasing reaction temperatures, and the apparent Arrehenius activation energy was 19.6 kJ.mol-1. In the reaction temperature range of 85 degrees C-105 degrees C, the apparent Arrehenius activation energy was zero.
Su
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W
Research Institute of Photocatalysis, Fuzhou University, Fuzhou 350002.
Fu
X
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Wei
K
K
D002384:Catalysis; D006842:Hydrocarbons, Brominated / Q000737:chemistry*; D010782:Photolysis; D017550:Spectroscopy, Fourier Transform Infrared; D013431:Sulfates / Q000494:pharmacology*; D013696:Temperature; D014025:Titanium / Q000494:pharmacology*
D006842:Hydrocarbons, Brominated; D013431:Sulfates; C009495:titanium dioxide; C005218:methyl bromide; D014025:Titanium