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《Environmental Science & Technology》 2008-07
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Adsorption and Photocatalytic Property of Erbium Ion Doping TiO_2

LIANG Chun-hua1,2, LI Fang-bai2 (1. Department of Chemistry and Chemical Engineering, Huaihua University, Huaihua 418008, China; 2. Guangdong Key Laboratory of Integrated Control of Agricultural Environment Pollution, Guangdong Institute of Ecoenvironment and Soil Science, Guangzhou 510650, China)  
A series of erbium ion-doped TiO2(Er3+-TiO2) catalysts were prepared by sol-gel method and characterized by means of XRD and diffusive reflectance spectra(DRS). Results showed that erbium ion doping could inhibit the increase of crystallite size and enhance thermal stability of TiO2. DRS results showed that erbium ion doping TiO2 catalyst had significant absorption between 400nm and 700nm. The adsorption isotherm and degradation of Orange I were investigated in aqueous suspension of pure TiO2 or Er3+-TiO2 catalyst. Results showed that Er3+-TiO2 catalyst had higher adsorption equilibrium constants and better adsorption capacity than pure TiO2. Kinetics of Orange I degradation using different Er3+-TiO2 catalyst were also studied, and results demonstrated that degradation of Orange I under both UV radiation and visible light was more efficient with Er3+-TiO2 catalyst than with pure TiO2, and an optimal dosage of erbium ion at 1.5% achieved the highest degradation rate for Orange I.
【Fund】: 广东省科技攻关项目(2005B10301001);; 怀化学院资助项目
【CateGory Index】: O643.36
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