Preparation of Novel Sn/Se Codoped TiO2 by Colloidal Carbon Spheres and Their Photocatalytic Properties
In this paper,TiO2 hollow spheres,Se-doped TiO2 hollow spheres and Sn/Se-doped TiO2 hollow spheres were prepared by hydrothermal-calcination method using colloidal carbon spheres as templates,in order to enhance the photocatalytic performance of TiO2.At the same time,the morphol-ogy,structure and elemental composition of Sn/Se-TiO2 hollow spheres were characterized.The photo-catalytic performance of the samples was evaluated by using Rhodamine B as a simulated pollutant.The results show that TiO2 is a single anatase phase,and Sn and Se are successfully doped into the TiO2 lattice.The Sn/Se co-doping results in the formation of defect levels,decreases the band gap width and the recombination probability of electron-hole pairs,and improves the response range of visi-ble light.When the Se doping amount is 2.0%and the Sn doping amount is 0.5%,the photocatalytic performance of the sample is the best,and the removal rate is 76.92%.Under the same conditions,the photocatalytic efficiency of hollow spheres is as follows:TiO2<Se-TiO2<Sn/Se-TiO2.The results indicated that the photocatalytic performance of TiO2 was improved by Sn/Se codoped hollow spheres.
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