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Study on the Photocatalytic Degradation of Azo dyestuff in Aqueous Solution

HUA Ri mao,YUE Yong de,LI Xue de,ZHANG Dong qing,HE Li wen (Department of Plant Protection,Anhui Agricultural University,Hefei 230036)  
Photocatalytic degradation of five azo dyestuff by H 2O 2 and TiO 2 were studied under the high pressure mercury lamp,UV lamp and sunlight H 2O 2 and TiO 2 had a significant photocatalytic decolorizing effect on these dyes When the dyes pH was 3 or 9, concentrations of H 2O 2and TiO 2 were 0 4% and 0 25%,they showed the highest decolorizing rate The decolorizing effect of TiO 2 was better than that of H 2O 2 The mix catalytic showed a even better decolorizing effect The reaction of photo catalytic degradation was first order reaction in kinetics There was a positive relationship between remove ratio of COD and decolorizing ratio
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