硅钨酸/TiO_2复合光催化材料光解水催化性能研究  

Photocatalytic Properties for Photocatalytic Water Splitting of H_4SiW_(12)O_(40)/TiO_2

作　　者：兰文兰[1] 李洁[1] 陈启元[1] 

机构地区：[1]中南大学化学化工学院,长沙410083

出　　处：《有色金属（冶炼部分）》2009年第3期35-37,41,共4页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家"863"资助项目(2002AA327140);教育部新世纪优秀人才支持计划(NCET.05.0691)

摘　　要：采用浸渍法制备了复合杂多酸H4SiW12O40/TiO2光催化材料,并用XRD、FT-IR和UV-Vis-DRS研究了其结构形态,同时考察了H4SiW12O40/TiO2光催化剂对光解水制氧的应用研究。结果表明,H4SiW12O40/TiO2仍然保留Keggin结构,TiO2均匀固载在H4SiW12O40中,H4SiW12O40与TiO2之间仅仅是简单的物理吸附。在紫外光辐射下光催化分解水制氧的实验中,H4SiW12O40/TiO2的光催化析氧速率高达231.37μmol/(L.h),为纯H4SiW12O40的1.37倍。A new complex heteropoly acid, H4SiW12O40/TiO2, was prepared by immersion method, and then characterized with XRD, FTIR and UV-Vis techniques. By means of this catalytic material, the optimum photocatalytic conditions of photocatalytic activity for oxygen evolution have been studied. The resuits show that the H4SiW12O40/TiO2 still reserved the Keggin structure. A physical adsorption existed between H4SiW12O40 and nanosized titania. In the experiment of water splitting to oxygen under UV-illuminated condition, the rate for oxygen evolution of H4SiW12O40/TiO2 was up to 231.37 μmol/（L · h）, which was 1.37 times of that of pure H4SiW12O40.

关 键 词：硅钨酸 二氧化钛 光解水 氧气 

分 类 号：TB34[一般工业技术—材料科学与工程]