新型等离子体光催化剂Au/Cd_2Nb_2O_7的制备和性能研究  

Synthesis and Performance of Novel Au/Cd_2Nb_2O_7 Plasmonic Photocatalyst

作　　者：黄彩进[1] 王顺文[1] 

机构地区：[1]福州大学光催化研究所国家重点实验室培育基地,福州350002

出　　处：《武汉理工大学学报》2011年第10期7-11,共5页Journal of Wuhan University of Technology

基　　金：国家重大基础发展计划"973"项目(2007CB613306)

摘　　要：通过沉积-沉淀法将纳米Au颗粒负载于宽带隙的Cd2Nb2O7光催化剂上,利用纳米金的表面等离子体效应,使其具有可见光响应。样品通过X射线粉末衍射(XRD)、透射电镜(TEM)、紫外-可见漫反射(UV-Vis DRS)、X射线光电子能谱(XPS)和液体荧光(PL)等表征了其晶相结构、形貌、光吸收性能、表面化学态和活性物种。结果表明,催化剂中的金是以金属态的形式存在,其粒径大约为5nm,并且在载体表面的分散性良好;催化剂在可见光区540nm处有明显的Au纳米粒子的表面等离子体共振吸收峰。光催化降解罗丹明B结果表明所合成的Au-Cd2Nb2O7具有良好的可见光光催化活性,同时对其可能的光催化降解机理也进行了探讨。A novel deposition-precipitation method was successfully developed to loading Au nanoparticles on the surface of Cd2Nb2O7 photocatalyst with a wide band-gap. The as-prepared photocatalyst exhibited visible light response properties due to the Surface Plasmon Resonance （SPR） of Au nanoparticles. The crystalline structure, morphology, photoabsorption performance, surface chemical state and aetive species of the as-synthesized sample were characterized by X-ray powder diffraction （XRD）, UV-Vis diffuse reflectance spectra （UV-Vis DRS）, transmission electron microscopy （TEM）, X-ray photoelectron spectra （XPS） and photoluminescence （PL）. Results showed that the Au existed in the form of metallic state and Au nanoparticles with an average diameter of ca 5 nm were uniformly loaded on Cd2 Nb2O7. The SPR peak of Au-Cd2 Nb2 O7 was clearly observed at ca 540 nm in the visible light region. In addition, the photocatalyst exhibited an efficient photocatalytic activity for degrading rhodamin B （RhB） under visible light irradiation. Furthermore, the possible photocatalytic mechanism has also been proposed.

关 键 词：沉积-沉淀法 Au纳米颗粒 表面等离子体效应 铌酸盐 光催化 

分 类 号：O614.4[理学—无机化学]