(中南大学 冶金与环境学院，长沙 410083)
摘 要: 采用化学水浴法制备Bi2O3薄膜，并通过电沉积结合后退火工艺在其表面负载ZnFe2O4进行改性，通过XRD、SEM、Raman、XPS、UV-vis等对Bi2O3样品及Bi2O3/ZnFe2O4复合薄膜进行表征。以制备的薄膜作为光电极，研究其光电化学性能，并首次报道其在光电催化降解有机污染物中的应用。结果表明：ZnFe2O4的复合拓宽Bi2O3的吸光范围，提高光吸收系数，抑制光电化学反应过程中光生载流子的复合，从而使Bi2O3/ZnFe2O4复合薄膜在Na2SO4溶液中的光响应电流密度是纯相材料的4倍左右，AM1.5光照下的光电降解亚甲基蓝性能相比于Bi2O3有明显提高。
关键字: 异质结；Bi2O3/ZnFe2O4；光电化学；降解
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:Bi2O3 thin film was prepared by chemical bath deposition, and ZnFe2O4 was prepared by electrodeposition and post-annealing. The Bi2O3 and Bi2O3/ZnFe2O4 composite films were characterized by XRD, SEM, Raman, XPS and UV-vis. The photoelectrochemical performance of the prepared film as a photoelectrode and its application in photoelectrocatalytic degradation of organic pollutants was studied for the first time. The results show that the load of ZnFe2O4 enhances the absorption range of Bi2O3, increases the light absorption coefficient and inhibits the recombination of carriers at the interface between semiconductor and solution. The photocurrent density of Bi2O3/ZnFe2O4 composite film is 4 times of pure phase material in the Na2SO4 solution. The performance of methylene blue photoelectric degradation under AM1.5 illumination is significantly improved compared with pure Bi2O3.
Key words: heterojunction; Bi2O3/ZnFe2O4; photoelectrochemical; degradation
