论文部分内容阅读
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.
Firstly, P123 was used as a template to prepare TiO2 carrier by sol-gel method, and then mesoporous BiVO4 / TiO2 composite photocatalyst was prepared by precipitation method.Using X-ray diffractometer, diffuse reflectance absorption spectrometer and specific surface analyzer, The results show that TiO2 in the catalyst sample mainly exists in anatase type and BiVO4 is a mixed crystal in which tetragonal phase and monoclinic phase coexist. Compared with pure BiVO4 and TiO2 photocatalyst, BiVO4 / TiO2 composite The photocatalyst has higher visible light absorption, better specific surface area and uniform mesoporous structure.The visible light degradation test of humic acid shows that the photodegradation rate decreases gradually with the initial concentration of humic acid, ln (C / C0) showed a linear relationship with t.The changes of fluorescence spectra, infrared spectra and GC-MS spectra during the photocatalytic degradation of humic acid were studied synchronously.