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Enhanced Photocatalytic Properties of Mesoporous SnO2 Induced by Low Concentration ZnO Doping

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journal contribution
posted on 2007-09-05, 00:00 authored by Zhenhai Wen, Geng Wang, Wu Lu, Qiang Wang, Qian Zhang, Jinghong Li
Mesoporous SnO2 doped with a low concentration of ZnO (m-SnO2/ZnO), prepared through a hydrothermal method by using cetyltrimethylammonium bromide (CTAB) as a structure-directing agent, has been characterized by transmission electron microscopy, powder X-ray diffraction, and nitrogen adsorption−desorption technologies. It was found that doped m-SnO2 showed different properties compared with undoped mesoporous SnO2 (m-SnO2). The former not only had a larger Brunauer−Emmett−Teller (BET) surface area but also showed a more stable mesoporous structure against high-temperature sintering than did the latter. Furthermore, m-SnO2/ZnO exhibited a significant enhancement of photocurrent and photocatalytic capability toward degrading rhodamine B (RhB) compared to undoped mesoporous SnO2. The improvement of photocatalytic activity for m-SnO2/ZnO might be attributed to its higher specific surface area and enhanced charge separation that derive from the coupling of ZnO with SnO2.