(中南大學(xué) 冶金與環(huán)境學(xué)院，長(zhǎng)沙 410083)
摘 要: 采用化學(xué)水浴法制備Bi2O3薄膜，并通過電沉積結(jié)合后退火工藝在其表面負(fù)載ZnFe2O4進(jìn)行改性，通過XRD、SEM、Raman、XPS、UV-vis等對(duì)Bi2O3樣品及Bi2O3/ZnFe2O4復(fù)合薄膜進(jìn)行表征。以制備的薄膜作為光電極，研究其光電化學(xué)性能，并首次報(bào)道其在光電催化降解有機(jī)污染物中的應(yīng)用。結(jié)果表明：ZnFe2O4的復(fù)合拓寬Bi2O3的吸光范圍，提高光吸收系數(shù)，抑制光電化學(xué)反應(yīng)過程中光生載流子的復(fù)合，從而使Bi2O3/ZnFe2O4復(fù)合薄膜在Na2SO4溶液中的光響應(yīng)電流密度是純相材料的4倍左右，AM1.5光照下的光電降解亞甲基藍(lán)性能相比于Bi2O3有明顯提高。
關(guān)鍵字: 異質(zhì)結(jié)；Bi2O3/ZnFe2O4；光電化學(xué)；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
