Rationally Designed Bi2M2O9 (M = Mo/W) Photocatalysts with Significantly Enhanced Photocatalytic Activity |
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| Authors: | Fangzhi Wang Xiaoyan Zhou Jing Li Qiuyue He Ling Zheng Qing Liu Yan Chen Guizhai Zhang Xintong Liu Hongda Li |
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| Affiliation: | 1.School of Resources and Environmental Engineering, Shandong Agriculture and Engineering University, Jinan 250100, China; (F.W.); (X.Z.); (J.L.); (Q.H.); (L.Z.); (Q.L.); (Y.C.); (G.Z.);2.School of Light Industry, Beijing Technology and Business University, Beijing 100048, China;3.School of Microelectronics and Materials Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China |
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| Abstract: | ![]()
Novel Bi2W2O9 and Bi2Mo2O9 with irregular polyhedron structure were successfully synthesized by a hydrothermal method. Compared to ordinary Bi2WO6 and Bi2MoO6, the modified structure of Bi2W2O9 and Bi2Mo2O9 were observed, which led to an enhancement of photocatalytic performance. To investigate the possible mechanism of enhancing photocatalytic efficiency, the crystal structure, morphology, elemental composition, and optical properties of Bi2WO6, Bi2MO6, Bi2W2O9, and Bi2Mo2O9 were examined. UV-Vis diffuse reflectance spectroscopy revealed the visible-light absorption ability of Bi2WO6, Bi2MO6, Bi2W2O9, and Bi2Mo2O9. Photoluminescence (PL) and photocurrent indicated that Bi2W2O9 and Bi2Mo2O9 pose an enhanced ability of photogenerated electron–hole pairs separation. Radical trapping experiments revealed that photogenerated holes and superoxide radicals were the main active species. It can be conjectured that the promoted photocatalytic performance related to the modified structure, and a possible mechanism was discussed in detail. |
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| Keywords: | Bi2W2O9 Bi2Mo2O9 modified structure visible light photocatalysis |
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