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首次以三种不同的含钛有机物为氧化钛的前驱体,合成了三种TiO_2呈单层分散状态的TiO_2修饰的介孔分子筛MCM-41,并以XRD,FT-IR,液氮温度下N_2吸附-脱附曲线,固体UV-vis漫反射等表征手段对其结构特征和氧化钛分散状态进行了研究.TiO_2在介孔分子筛MCM-41孔道中分散,MCM-41仍能保持骨架结构,没有品相TiO_2生成;TiO_2与MCM-41孔道表面的≡Si—OH以化学键连接,生成Si—O—Ti键;TiO_2在MCM-41内孔壁呈均匀单层分散状态;TiO_2粒子的减小使其对紫外光的吸收发生明显的蓝移现象.并以苯酚降解反应为模型检验合成的具有光催化性的TiO_2修饰的MCM-41的光催化活性.
For the first time, three TiO 2 -substituted mesoporous molecular sieves, MCM-41, were synthesized with three different titanium-containing organic compounds as precursors for titanium oxide. XRD, FT-IR, Adsorption-desorption curve and solid-state UV-vis diffuse reflectance spectroscopy were used to characterize the structure and the dispersion state of titanium oxide.Dispersion of TiO 2 in mesoporous molecular sieve MCM-41 was observed. MCM-41 still retained the framework structure without TiO 2 forms on the surface of MCM-41, and Si-O-Ti bond is formed between ≡Si-OH and ≡Si-OH on the surface of MCM-41. TiO 2 is uniformly dispersed in the inner wall of MCM-41. The blue-shift phenomenon of UV-light absorption was observed, and the photocatalytic activity of the synthesized TiO 2 modified MCM-41 was tested by the phenol degradation reaction model.