石墨相氮化碳复合及氢化改性提升BiVO4光催化性能的研究  

Photocatalytic activity of BiVO4 enhanced by g-C3N4 coupling and hydrogenation treatment

作　　者：蒋力栋 陈达 秦来顺 梁俊辉 Jiang Lidong;Chen Da;Qin Laishun;Liang Junhui(School of Materials Science and Engineering,China Jiliang University,Hangzhou 310018)

机构地区：[1]中国计量大学材料科学与工程学院,杭州310018

出　　处：《化工新型材料》2020年第7期210-214,220,共6页New Chemical Materials

摘　　要：通过水热法简单合成了可见光响应光催化剂BiVO4,再采用一步煅烧法制备了BiVO4/g-C3N4,最后在20MPa纯氢气气氛下以200℃处理4h获得氢化BiVO4样品(H-BiVO4/g-C3N4),通过X射线衍射、透射电镜等手段证实成功合成BiVO4/g-C3N4复合光催化剂,并在氢化样品表面发现无序层;固体漫反射光谱说明改性后的样品对可见光吸收增强;可见光下光催化降解亚甲基蓝,发现改性后的样品降解效率提升;通过光电化学测试,明确g-C3N4复合与氢化改性提升BiVO4光催化活性的原因主要是光生载流子分离传输效率的提升。The visible light-responsive BiVO4 photocatalyst was synthesized through a simple hydrothermal process,and BiVO4/g-C3N4 was then prepared by one-step calcination method.The hydrogenated BiVO4/g-C3N4(HBiVO4/g-C3N4)sample was finally obtained by treating BiVO4/g-C3N4 powder at 200℃for 4 hin a 20 MPa hydrogen atmosphere.The successful synthesis of BiVO4/g-C3N4 composite photocatalysts were determined by XRD,FESEM and TEM measurements,and the disordered layer on the surface of the hydrogenated sample was observed.The DRS result showed that the visible light absorption of the modified sample was enhanced.The photocatalytic results showed that the degradation efficiency of the modified sample exhibited significantly improved to methylene blue under visible light in comparison with the pristine BiVO4 sample.The photoelectrochemical test confirmed that the improved photocatalytic activity of the H-BiVO4/g-C3N4 sample could be ascribed to the increased separation and transfer efficiencies of photogenerated carriers induced by the coupling of g-C3N4 and hydrogenation treatment.

关 键 词：钒酸铋 石墨相氮化碳 氢化处理 光催化剂 降解亚甲基蓝 

分 类 号：TB32[一般工业技术—材料科学与工程]