二氧化钛介孔膜制备、表征及其光催化性能研究

PREPARATION AND CHARACTERIZATION OF MESOPOROUS TIO_2 FILMS AND THEIR PHOTOCATALYTIC ACTIVITY

采用提拉-浸渍法在铟化锡导电玻璃(ITO)表面制备TiO2介孔薄膜,通过X射线衍射分析、透射电镜及N2吸附-脱附等测试对材料进行了表征。结果表明,薄膜材料为高催化活性的锐钛矿型,具有高比表面积(166 m.2g-1)和较窄孔径分布(2～10 nm)。以TiO2/ITO为工作电极,建立三电极光催化体系。结果表明,降解初始质量浓度20mg.L-1的甲基橙光电催化反应中,当pH=2、外加阳极偏电压为0.6 V、电解液Na2SO4的浓度为10 mmol.L-1时降解效果好,降解率可达97%。

Mesoporous photocatalytic TiO2 films were prepared via a simple method that involves dip-coating of ITO glass into an organic/inorganic sol followed by calcination of the coating at 350 ℃, and characterized by X-ray diffraction（XRD）, transmission electron microscope （TEM） and N2 adsorption-desorption isotherm. The results showed that the anatase crystal phase with high catalytic activity include high surface area （166 m2.g-1） and narrow pore size distribution ranging from 2～10 nm. The photoelectrocatalytic system with three kinds of electrodes （working electrode, Pt electrode and Ag/AgCl electrode） was built by TiO2/ITO as working electrode. The system showed the high photoelectrocatalytic activities on degradation of Methyl Orange waste at 20 mg.L-1, under pH at 2,the bias potential of 0.6 V, and electrolyte concentration of 10 mmol.L-1, the removing rate of methyl orange was up to 97.0%.