
Effects of hydroxyl free radical inhibitors on TiO2 photocatalysis with different crystalline
TANG JianJun1;FAN XiaoJiang2;ZOU Yuan1;ZHANG Wei1;ZHOU KangGen2
Journal of Beijing University of Chemical Technology ›› 2009, Vol. 36 ›› Issue (3) : 36-40.
Effects of hydroxyl free radical inhibitors on TiO2 photocatalysis with different crystalline
TANG JianJun1;FAN XiaoJiang2;ZOU Yuan1;ZHANG Wei1;ZHOU KangGen2
Hydroxyl free radical (·OH) production from photocatalytic reaction systems with different crystalline forms of TiO2 as photocatalyst has been analyzed by fluorescence spectroscopy. The results indicated that ·OH radicals could be constantly produced by rutile TiO2 under visiblelight irradiation in the presence of H2O2, whereas ·OH radicals could not be detected when using anatase TiO2 as photocatalyst. Photocatalytic results indicated that phenol could be degraded by visiblelight photocatalysis with both rutile and anatase TiO2 in thepresence of H2O2, and the presence of hydroxyl free radical inhibitors (tert-butyl alcohol or methanol) led to a significant decrease in the degradation efficiency of rutile TiO2 but had much less effect on anatase TiO2 . The degradation of phenol occurred mainly in solution when using rutile TiO2 as photocatalyst, whereas the degradation occurred mainly at the TiO2 particle surface when using anatase TiO2 as photocatalyst.
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