ZnFe_(2)O_(4)/BiVO_(4)/C的水热制备及白光LED下的光催化研究

Hydrothermal Preparation and Photocatalytic Study of ZnFe_(2)O_(4)/BiVO_(4)/C under White LED

本文采用水热法制得碳球(C),再原位生长BiVO_(4)和ZnFe_(2)O_(4),得到BiVO_(4)/C、ZnFe_(2)O_(4)/BiVO_(4)/C复合光催化剂,利用XRD、SEM、EDS、UV-Vis DRS等方法对材料进行了表征。在白光LED光源下,通过降解罗丹明B对样品的光催化性能进行评价。结果表明,在60分钟可见光下,BiVO_(4)对罗丹明B的降解率为31.7%,BiVO_(4)(50 wt%)/C对罗丹明B的降解率为55.6%,ZnFe_(2)O_(4)(15 wt%)/BiVO_(4)(50 wt%)/C对罗丹明B的降解率高达94.1%。高效的降解率可能与复合结构的异质结有关,碳球提高了BiVO_(4)对可见光的吸收,ZnFe_(2)O_(4)/BiVO_(4)促进了光生电子-空穴的分离,从而有效增强光降解性能。

Carbon spheres(C)were prepared by hydrothermal method,and then BiVO_(4)and ZnFe_(2)O_(4)were grown in situ to obtain BiVO_(4)/C and ZnFe_(2)O_(4)/BiVO_(4)/C composite photocatalysts.The materials were characterized by XRD,SEM,EDS and UV-Vis DRS.The photocatalytic performance of the samples were evaluated by degrading Rhodamine B under white LED light source.The results showed that under 60 min visible light,the degradation rate of Rhodamine B by BiVO_(4)was 31.7%,that by BiVO_(4)(50 wt%)/C was 55.6%,and by ZnFe_(2)O_(4)(15 wt%)/BiVO_(4)(50 wt%)/C was 94.1%.The high degradation rate may be related to the heterojunction of the composite structure.The carbon ball improves the absorption of BiVO_(4)to visible light,and ZnFe_(2)O_(4)/BiVO_(4)promotes the separation of photogenerated electrons and holes,so as to effectively enhance the photodegradation performance.