Novel 3D flowerlike BiOCl_0.7Br_0.3 microspheres coupled with graphene sheets with enhanced visible-light photocatalytic activity for the degradation of rhodamine B

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• 作者：Guogang Tang^a ; ^b ; Jinze Dong^a ; Kongqiang Wu^a ; Wei Liang^a ; Dongyi Zhou^a ; Shaobin Ma^a ; Hua Tang^a ; ^{tanghua@mail.ujs.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Changsheng Li^a ; ^{lichangsheng@ujs.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：B. Composites ; Bismuth mixed oxyhalidesare ; Solid solution ; Graphene sheets ; Visible-light photocatalysis
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：42
• 期：5
• 页码：5607-5616
• 全文大小：2765 K

文摘

Highly efficient visible-light-driven 3D flowerlike BiOCl_0.7Br_0.3 microspheres coupled with graphene sheets with different graphene contents have been synthesized by a facile solvothermal process. The as-prepared samples were characterized by power X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), N₂ adsorption–desorption analysis and UV–vis diffuse reflectance spectra (DRS). Characterization results showed BiOCl_0.7Br_0.3 microspheres were composed of numerous nanoplates with a thickness of about 20 nm and dispersed uniformly on the surface of graphene. Moreover, the photocatalytic activities of these BiOCl_0.7Br_0.3/graphene composites under visible-light irradiation (λ>420 nm) were evaluated by the degradation of rhodamine B (RhB). The results indicate all BiOCl_0.7Br_0.3/graphene composites exhibited much higher photocatalytic activities than pristine BiOCl_0.7Br_0.3, pure BiOBr and BiOCl, and the highest activity was reached by the BiOCl_0.7Br_0.3/graphene composite photocatalyst with 10 wt% of graphene. The enhanced photocatalytic activity could be largely ascribed to more effective charge transportations and separations, larger BET surface areas and the increased light absorption. In addition, a possible photocatalytic mechanism of the BiOCl_0.7Br_0.3/graphene composites on basis of the experimental results was also proposed.