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Si掺杂TiO2光催化材料的制备、活性及其机理

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Abstract:

采用两步溶胶-凝胶法制备了Si掺杂TiO2(SiTiO2)粉体,通过X射线衍射、热重-差热分析和X射线光电子能谱表征了SiTiO2粉体样品的晶相及表面结构,以甲基橙为目标物考察了Si掺杂TiO2的光催化活性。研究发现SiTiO2粉体在水中降解有机物时,比纯TiO2粉体具有更高的光催化活性;SiTiO2粉体具有锐钛矿结构,少量Si的引入不仅会抑制TiO2粒径的增大及晶型的转变,而且在Ti原子和Si原子热扩散过程中将导致催化剂的近表面处产生Ti3+。催化剂外表面存在的Ti4+与近表面处的Ti3+形成的电场对电荷的分离作用及Ti3+和氧空位缺陷的联合作用是Si掺杂TiO2的催化活性大幅度提高的主要原因。

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