关键词: 镧负载, 分子筛, 二氧化钛, 光催化, 甲基橙

Abstract:

Using SBA15 as carrier and tetrabutyl titanate as titanium source, the SBA15 molecular sieve loaded with TiO₂ was prepared by solgel method. The different mass concentrations of lanthanum nitrate were loaded onto TiO₂-SBA-15 by impregnation method, and TiO₂-SDA-15 catalysts with different lanthanum loading were prepared by high temperature calcination method. The series of catalysts were characterized by X-ray diffraction (XRD), infrared spectrum (FTIR), inductively coupled plasma (ICP) emission spectrum, transmission electron microscopy (TEM) and N₂ adsorptiondesorption isotherm. The TiO₂-SBA-15 catalysts with different La mass contents were used as photocatalysts to degrade the solution of methyl orange. We investigated the effect of La loading mass content on the degradation rate of methyl orange. The experimental results show that the degradation rate of methyl orange is 100% when La loading mass content is 0.14% and UV lamp irradiation for 140 min.

Key words: La loading, molecular sieve, titanium dioxide, photocatalysis, methyl orange