【摘要】 以天然沸石为载体,研究了其负载TiO2后对甲基橙溶液的光催化降解效果,探讨了TiO2与沸石的结合类型。通过对负载前后反应动力学模式变化的研究,阐释TiO2/沸石体系的光催化反应进程。从复合前后样品的AFMI、R、发射光谱变化上看,部分TiO2与沸石载体形成了新的Ti-O-Si或Ti-O-Al的化学键。光催化实验结果和动力学分析显示,在反应的初始阶段,当TiO2中引入多孔的沸石载体后,催化剂对甲基橙的降解过程由原来纯粹的吸附控制模式向反应控制模式转变,但还没有达到纯粹的反应控制的程度。沸石载体是通过提高吸附过程的速率,来提升初始阶段的光催化反应速率(R0)的。更多还原

【Abstract】 The porous natural zeolites have been employed as the TiO₂ supports,and the photocatalytic process of TiO₂/zeolite on methyl orange（MO） has been studied.The interface mechanism between the TiO₂ and the natural zeolite has been discussed,and the change of the kinetic process before and after TiO₂ loading has been studied for the first time.The "super reaction area" model has been brought out for liquid system,in order to explain the photocatalytic process of the TiO₂/zeolite system.The AFM,IR and spectra analysis,a certain amount of TiO₂ combined with natural zeolite by Ti-O-Si or Ti-O-Al chemical bond.At the initial stage of photcatalytic degradation（PCD） of MO,the addition of nature zeolite supports have made the initial reaction change from original poor "adsorption controlled" process to the "reaction controlled" process.Since all of the reaction rates of TiO₂/zeolite are higher than the pure TiO₂ powder,it’s obvious that the zeolite supports have enhanced the rate of the slower adsorption process resulting in the increase of the initial reaction rate R₀.The first-order reaction rate k₁ shows that no matter what kind of process controlled the PCD process at the initial stage the whole process of PCD must be an adsorption controlling process undoubtedly because of the proliferating of the medial product.更多还原