Received March 13, 2001,Revised April 24, 2001, Accepted , Available online

Volume 14,2002,Pages 428-432

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Titanium dioxide(TiO2 ) samples of different crystal forms were prepared by hydrolysis tetrabutyl titanate in various water to alkoxide ratios and sintering the hydrolysis product at different temperatures.The photocatalysts coated on hollow glass beads and loaded with platinum varying from 0.2% to 2.4% by weight.The photecatalytic degradation rate of sodium pentachlorophenolate (PCP- Na) depends on the preparing conditions such as.:sintering temperatures,water to alkoxide ratios(R),platinum content and the size.The proper conditions of preparation photoeatalysts are as follows:the ratio of TiO2:sodium silicate :hollow glass beads :platinum is 10:5:20:0.15(w/w),R is 100,sintering temperature is 650℃,and the size of hollow glass is 0.5 - 1 mm.Under these conditions,the ratio between aeatase and rutile of the photocatalyst is 2:1,and the photocatalytie activity is high

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