Bi2Ti2O7/TiO2/Bi4Ti3O12多异质结的构筑及其增强的可见光催化性能
Chinese Journal of Inorganic Chemistry（2023）
Abstract
以静电纺丝技术制备的TiO2纳米纤维为基质,硝酸铋为铋源,KOH为矿化剂,成功制备了多异质结Bi2Ti2O7/TiO2/Bi4Ti3O12复合纳米纤维光催化剂.通过X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外可见漫反射光谱(UV-VisDRS)等一系列表征,对其物相组成、微观形貌和光学性质等进行分析.结果表明:TiO2纳米纤维的介入,将Ⅰ型异质结Bi2Ti2O7/Bi4Ti3O12分离为2个Ⅱ型异质结Bi2Ti2O7/TiO2和Bi4Ti3O12/TiO2.Bi2Ti2C7、Bi4Ti3O12和TiO2三者的协同作用,有效提高了可见光吸收能力,改变了光生载流子的传输路径,降低了光生电子与空穴的复合几率,从而获得高效的光催化降解CH3CHO性能.可见光照8 h,Bi4Ti3O12/TiO2Bi2Ti2O7复合纳米纤维对CH3CHO的降解率达到87.1％.
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