TiO2-SiO2-GF复合光催化剂对甲醛光催化降解研究

使用溶胶凝胶法制备二氧化硅-二氧化钛-玻璃纤维体系复合催化膜(SiO2-TiO2-GF),并通过X射线衍射(XRD)、紫外漫反射衍射(DRS)、扫描电镜(SEM)和能谱(EDS)等手段考查了SiO2-TiO2-GF体系复合催化膜的光学和结构参数及其表面形貌.采用气相甲醛评估SiO2-TiO2-GF体系催化膜的光催化效率.实验结果表明,相比二氧化钛-玻璃纤维(TiO2-GF)体系催化膜,SiO2-TiO2-GF体系复合催化膜TiO2锐钛矿相的质量分数增高;晶粒尺寸从11.29nm减小为6.95nm;SiO2为主的玻璃纤维表面多孔结构大大地增强了光催化效果,其Langmuir-Hinshelwood(L-H)方程的动力学常数从0.02784mol/m3min提高到了0.09058mol/m3min;且有Ti—O—Si键生成,薄膜不易脱落.

Research on photocatalytic degradation of formaldehyde using TiO2-SiO2 photocatalyst supported on glass fibre

Thin film of SiO_2-TiO_2-glass fibre (SiO_2-TiO_2-GF) composite material is prepared by sol-gel coating technique. X-ray reflection diffraction (XRD) spectra, UV-Vis diffuse reflectance spectra (DRS), scanning electron microscope (SEM) and energy dispersion spectroscopy (EDS) have been used to investigate the optical and structural properties, surface morphology of the composite film. The photodegradation of gaseous formaldehyde has been examined to assess the efficiency of SiO_2-TiO_2-GF film. Compared with TiO_2-GF film, the SiO_2-TiO_2-GF film shows higher anatase phase, smaller particle (decreased from 11.29 nm to 6.95 nm), more effective photocatalytic effect which is reflected by k (the rate constant of Langmuir-Hinshelwood equation, increased from 0.027 84 mol/m~3min to 0.090 58 mol/m~3min) because of pore morphology of SiO_2 of glass fibre, and the Ti-O-Si band makes film solid.