SBA-15 mesoporous materials loaded with 8%–42% TiO₂ were prepared by post-synthesis hydrolysis using ilmenite as the TiO₂ source. X-ray diffraction, high-resolution transmission electron microscopy, nitrogen adsorption–desorption measurements, and Fourier-transform infrared, X-ray photoelectron, Raman, and ultraviolet-visible spectroscopies were used to investigate the TiO₂/SBA-15 morphology and crystal structure. The results show that TiO₂ was successfully loaded on the mesoporous SBA-15 and the highly ordered two-dimensional hexagonal structure was stable. The photocatalytic performances of the samples in dimethoate degradation under simulated solar light were investigated. The photocatalytic activity initially increased and then decreased with increasing TiO₂ loading. The 26% TiO₂/SBA-15 sample showed the highest photocatalytic activity and completely degraded dimethoate within 7 h. The catalytic activity of TiO₂/SBA-15 was 62% higher than that of pure TiO₂. This may be because of a synergistic effect resulting from the adsorption of dimethoate on the mesoporous material. The presence of Ti–O–Si species enhances the TiO₂ surface acidity and formation of surface adsorption sites; The adsorption and electron delocalization properties of SBA-15 are the main reasons for the observed enhancement of the pesticide degradation rate. These improves the TiO₂/SBA-15 photocatalytic activity. TiO₂/SBA-15 maintained high photocatalytic activity and good stability during four cycles, with a dimethoate degradation rate greater than 94%. The byproducts generated during photocatalysis were identified using gas chromatography-mass spectrometry. The photocatalytic degradation of dimethoate followed first-order kinetics. The mechanism of the photocatalytic degradation of dimethoate was investigated.

使用钛铁矿作为TiO ₂源，通过合成后水解制备了负载8％–42％TiO _2的SBA-15介孔材料。X射线衍射，高分辨率透射电子显微镜，氮吸附-解吸测量以及傅立叶变换红外光谱，X射线光电子，拉曼光谱和紫外可见光谱仪用于研究TiO ₂ / SBA-15的形貌和晶体结构体。结果表明，TiO ₂将其成功地加载到中孔SBA-15上，并且高度有序的二维六角形结构稳定。研究了样品在模拟太阳光下降解乐果的光催化性能。随着TiO ₂含量的增加，光催化活性开始增加，然后下降。26％TiO ₂ / SBA-15样品显示最高的光催化活性，并在7小时内完全降解了乐果。TiO ₂ / SBA-15的催化活性比纯TiO ₂高62％。这可能是由于乐果在中孔材料上的吸附产生了协同作用。Ti–O–Si物种的存在增强了TiO ₂表面酸度和表面吸附位的形成；SBA-15的吸附和电子离域特性是所观察到的农药降解速率提高的主要原因。这些提高了TiO ₂ / SBA-15的光催化活性。TiO ₂ / SBA-15在四个循环中保持较高的光催化活性和良好的稳定性，乐果的降解率大于94％。使用气相色谱-质谱法鉴定在光催化过程中产生的副产物。乐果的光催化降解遵循一级动力学。研究了光催化降解乐果的机理。