Study Of The Photocatalytic Degradation Of Dye Pollutants On Titanium Dioxide/Bentonite Catalysts

In this paper, titania/bentonite catalysts prepared by acid-catalyzed sol method is used as a photocatalyst in the photo degradation of dye pollutants in waste water. We prepared titanium dioxide photocatalyst loaded on bentonite (Xinghe of Inner-Mongolia) with tetrabutyl titanate as titanium source. The effect of heating temperature and the loading amount of TiO₂ were researched. The catalytic activity were checked by degradation rate and COD changed rate of Rhadamine B under UV light irradiation (high pressure mercury lamp) using P25 and TiO₂/bentonite catalysts. COD(Chemical oxygen demand) values are measured by the dichromate titration method (referred as CODcr). The catalysts are characterized by the method of UV-vis, XRD, BET, TG-DTA, ESR, DRS et al. The experimental results showed that titania/bentonite catalyst had a higher photocatalytic activity and a larger specific area when calcination temperature is 400℃ and TiO₂ loading is 50%. Furthermore, the COD changed rate of Rhadamine B is 99.7% and 97.2% under UV light irradiation of 3h using P25 and TiO₂/bentonite catalyst(Ti400), respectively. The COD changed rate of Rhadamine B is 68.6%and 77.1% under visible light irradiation of 30h using P25 and TiO₂/bentonite catalyst(Ti400), respectively. TiO₂/bentonite catalysts can be...