Fe^(3+)掺杂提高二氧化钛的光催化活性

Enhancement of Photocatalytic Activity on Titanium Dioxide by Fe^(3+) Doping

采用沉淀-水热的方法制备了Fe3+掺杂的TiO2光催化剂,通过XRD、Raman、XPS、UV-DRS等对催化剂的结构、光学吸收性质等进行了表征,并以罗丹明B为目标污染物对可见光催化活性进行了测试。实验结果表明:所制备的TiO2光催化剂为锐钛矿相结构;Fe3+的掺杂使得TiO2的初始吸收边明显向可见光区域拓宽,并且增强了TiO2在可见光区域的吸收;Fe3+掺杂后TiO2的可见光催化活性显著提高,以掺杂浓度为0.5%的TiO2光催化效果最好,在可见光下6h内可将罗丹明B溶液完全降解,降解率是未掺杂TiO2的4倍。

Fe^3＋ doped titanium dioxide photocatalyst was prepared by precipitation-hydrothermal method.The structures and optical properties of the as-prepared photocatalysts were characterized by XRD,Raman,XPS and UV-DRS.The photocatalytic activity was evaluated by measuring the decomposition of the distilled water solution of rhodamine B under visible light irradiation.The results showed that the major crystalline phase detected in all samples was anatase,and the optical absorption edge significantly shifted toward the visible region and increased absorbance in the visible region.The photocatalytic activity of titanium dioxide was enhanced greatly by Fe^3＋ doping.The titanium dioxide doped with 0.5% Fe^3＋ had the highest phtocatalytic activity and rhodamine B solution decomposed completely within 6h,and the degradation rate was approximately 4 times of the undoped titanium dioxide.