【摘要】 为了探讨TiO2晶粒形貌对光催化过程的作用规律,研究吸附法和浸渍法制备的TiO2光催化剂降解甲基橙的过程,并考察制备反应条件对催化剂形貌和活性的影响。通过剖析反应的基本过程后得出,扩散过程与表面反应过程耦合,催化剂活性与甲基橙浓度的相对高低决定反应过程的控制步骤,从而对表观级数产生影响。在催化剂活性的考评中发现,低Ti含量以及小粒径情况下影响光催化的关键因素是晶型,其次为含量、粒径。吸附法制备的光催化剂Ti含量高,粒径小,可控性好,具有比浸渍法制备的材料更好的催化性能。随着水量的增加,吸附相反应技术的优势越来越显著。更多还原

【Abstract】 In order to approach the influence of TiO2configuration on photocatalysis,the photo-catalytic degradation process of methyl-orange by TiO2which was prepared by adsorption phase reaction technique and impregnation methods was studied.The influence of preparation conditions on the morphology and activity of TiO2was also investigated.After analyzing the reaction,it assumes that the diffusion and surface reaction are coupled.The controlling step depends on the activity of catalyst and the concentration of methyl-orange.It affects the apparent order of the reaction.After evaluating the activity of catalyst,it is deduced that the key factor affecting the photo-catalytic activity is the type of crystal of TiO2,secondly the content of Ti and diameter of the particles.The catalyst prepared by adsorption phase reaction technique has a larger content of Ti,smaller diameter,and can be better controlled,thereby better photo-catalytic.With the increasing of water content,the advantage of adsorption phase reaction technique is becoming more and more conspicuous.更多还原