BiVO_4/TiO_2复合光催化剂的制备及可见光降解腐殖酸  

Preparation of BiVO_4/TiO_2 Composite Photocatalyst and the Photocatalytic Degradation of Sodium Humate

作　　者：胡蕾[1] 叶芝祥[1] 卢远刚[1] 徐成华[1] 

机构地区：[1]成都信息工程学院资源环境学院大气环境模拟与污染控制四川省高校重点实验室,四川成都610225

出　　处：《分子催化》2013年第4期377-384,共8页Journal of Molecular Catalysis(China)

基　　金：国家自然科学基金(No.51209024);大气环境模拟与污染控制四川省高校重点实验室开放基金(KFKT201302)

摘　　要：首先以P123为模板剂利用溶胶-凝胶法制备TiO2载体,然后采用沉淀法制得介孔BiVO4/TiO2复合光催化剂.采用X射线衍射仪、漫反射吸收光谱仪、比表面分析仪对所制得的光催化剂进行了表征.结果表明,催化剂样品中的TiO2主要以锐钛矿型存在,BiVO4为四方相和单斜相共存的混晶,与单纯的BiVO4、TiO2光催化剂相比,BiVO4/TiO2复合光催化剂具有更高的可见光吸收性能、较好的比表面积和均一的介孔结构.腐殖酸的可见光降解试验表明,随着腐殖酸初始浓度的增大,其光降解率逐渐降低,ln(C/C0)对t呈线性关系.试验同步研究了腐殖酸光催化降解过程中荧光光谱、红外光谱和GC-MS谱图的变化情况.The TiO2 support was prepared by Sol-Gel method with P123 as a template and the mesoporous BiVO4/ TiO2 catalyst was obtained by the precipitation method. The obtained photocatalysts were characterized by X-ray dif- fraction, UV-visible spectrophotometer and surface area analyzer. It mainly contained anatase TiO2, the mixed crystal BiVO4 with coexisting tetragonal and monoclinic phases. Compared with BiVO4 and TiO2, BiVOJTiO2 im- proved the performance of visible light absorbance and had a specific surface area and uniform mesoporous struc- ture. With the increase of the initial concentration of humic acid, the degradation rate decreased, and the change of In （C/Co） with time on it was linear. This research carried out a preliminary study on the fluorescence, infrared and GC-MS spectral changes in photocatalytic degradation of humic acid.

关 键 词：BIVO4 TIO2 光催化剂 可见光降解 腐殖酸 

分 类 号：O643.3[理学—物理化学] X703[理学—化学]