复合型异质结催化剂AgI-BiOI/ZSM-5可见光催化氧化NO  

Photocatalytic reduction of NO using heterojunction AgI-BiOI/ZSM-5 composite under visible light

作　　者：杨婧羚[1] 方泽坤 李淑贞[1] 廖唯辰[1] 龚挹彬 张琼[1] 朱林飞[1] 何春[1,2] 

机构地区：[1]中山大学环境科学与工程学院,广州510275 [2]广东省环境污染控制与修复技术重点实验室,广州510275

出　　处：《环境工程学报》2013年第8期3099-3104,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(20877025);广东省自然科学基金项目(S2011010001836);高校基本科研业务费中山大学青年教师重点培育项目(09lgpy20);教育部留学回国人员科研基金项目;广州市科技局科学技术项目(2010Z2-C1009);中山大学实验室开放基金项目(KF201129)

摘　　要：采用液相浸渍沉淀法制备AgI-BiOI/ZSM-5异质结催化剂,通过X-射线衍射(XRD)、紫外-可见光漫反射光谱(DRS)、扫描电镜(SEM)和交流阻抗(EIS)等表征技术对样品进行表征分析,研究AgI-BiOI/ZSM-5催化剂在可见光条件(λ>420 nm)下催化氧化NO的可行性及异质结催化剂的稳定性。研究结果表明,所制备的AgI-BiOI/ZSM-5催化剂在可见光下催化氧化NO的效率达到90%,表现出良好的催化活性,而且AgI-BiOI/ZSM-5在反复使用5次后其催化活性基本保持不变。EIS测试结果表明,AgI-BiOI/ZSM-5异质结的形成有利于光生电子和空穴的分离,从而提高了AgI-BiOI/ZSM-5的催化活性和稳定性。AgI-BiOI/ZSM-5 heterojunction photocatalyst was synthesized by impregnation-precipitation method,and characterized by X-ray diffraction（XRD）,UV-Vis diffuse reflectance spectra（DRS）,scanning electron microscopy（SEM） and electrochemical impedance spectroscopy（EIS） measurement.The feasibility and stability of AgI-BiOI/ZSM-5 for the photocatalytic reduction of NO were investigated under visible light（λ420 nm）.The results showed that the efficiency for the photocatalytic reduction of NO using AgI-BiOI/ZSM-5 can be achieved 90% under visible light.In addition,it was found that AgI-BiOI/ZSM-5 heterojunction photocatalyst was stable after 5 repeated uses under visible light,and the photocatalytic efficiency of AgI-BiOI/ZSM-5 after 5 repeated uses almost remained the same.The EIS results showed that the heterojunction structure of AgI-BiOI/ZSM-5 was beneficial to separate the photogenerated elections and holes,thus leading to the enhanced photocatalytic activity of AgI-BiOI/ZSM-5.

关 键 词：可见光催化 NO AgI-BiOI ZSM-5 异质结催化剂 

分 类 号：X511[环境科学与工程—环境工程]