Rationally Designed Bi2M2O9 (M = Mo/W) Photocatalysts with Significantly Enhanced Photocatalytic Activity

Molecules

Xintong Liu¹  Hongda Li²  Jing Li³  Qiuyue He³  Qing Liu³  Xiaoyan Zhou³  Ling Zheng³  Fangzhi Wang³  Yan Chen³  Guizhai Zhang³ 

[1] School of Light Industry, Beijing Technology and Business University, Beijing 100048, China;School of Microelectronics and Materials Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China;School of Resources and Environmental Engineering, Shandong Agriculture and Engineering University, Jinan 250100, China;

关键词: Bi₂W₂O₉;    Bi₂Mo₂O₉;    modified structure;    visible light;    photocatalysis;   

DOI  :  10.3390/molecules26237334

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown