Visible-light photocatalytic activity and mechanism of novel AgBr/BiOBr prepared by deposition-precipitation

查看全文 作　　者：LIN HaiLi CAO Jing LUO BangDe XU BenYan CHEN [1]ShiFu

机构地区：[1]College of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, China

出　　处：《Chinese Science Bulletin》索引2012年第57卷第22期,共7页

基　　金：supported by the National Natural Science Foundation of China(20973071,51172086);Natural Science Foundation of Educational Committee of Anhui Province(2012Z356);Youth Foundation of Huaibei Normal University(2011xqxm31) 摘　　要：A new composite photocatalyst AgBr/BiOBr was prepared by loading AgBr on a BiOBr substrate via deposition-precipitation and characterized by X-ray diffraction,scanning electron microscopy,high-resolution transmission electron microscopy and UV-vis diffuse reflectance spectroscopy.The as-prepared AgBr/BiOBr comprised face-centered cubic AgBr and tetragonal BiOBr particles.The average crystalline sizes of AgBr in the AgBr/BiOBr composites were less than 28.5 nm.The absorption edges of AgBr/BiOBr in visible-light region had a red shift with increasing AgBr content.Photocatalytic degradation of methyl orange results show that the AgBr/BiOBr composites could degrade methyl orange efficiently under visible-light irradiation (λ>420 nm).The optimal molar percentage of AgBr was 50 mol% with corresponding maximum k app of 0.00619 min -1.Active ·O 2- played a major role for methyl orange degradation while h + and ·OH had little effect on the photocatalytic process.The enhancement of photocatalytic activity of AgBr/BiOBr is mainly ascribed to the heterojunction effect between AgBr and BiOBr. 关键词：光催化活性可见光区溴化银沉积沉淀 AGBR 扫描电子显微镜透射电子显微镜

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Visible-light photocatalytic activity and mechanism of novel AgBr/BiOBr prepared by deposition-precipitation

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