BiVO_(4)光催化剂制备及降解罗丹明B研究

Ready of BiVO_(4) Photocatalyst and Its Degradation of Rhodamine B

采用化学沉淀结合煅烧法制备BiVO_(4)光催化剂,并用于对罗丹明B催化降解。环境扫描电子显微镜进行形貌表征,考察光催化时间、光催化剂用量及罗丹明B初始浓度对降解率的影响。结果表明:制备BiVO_(4)为纳米颗粒,平均粒径约50-70nm,颗粒间分散性较好。光催化实验结果表明,罗丹明B溶液的浓度随着光照时间的增加而不断减小,并且BiVO_(4)的光催化效果明显优于空白样品。光催化时间为200min,光催化剂用量5g·L^(-1)时,罗丹明B溶液的初始浓度为40mg·L^(-1),光催化降解率较高,可以达到最大为93%。

In this paper,BiVO_(4)photocatalyst was prepared by chemical precipitation coupled with calcination technology.It was used to catalyze the degradation of rhodamine B.The morphology of BiVO_(4)products were characterized by ESEM.The effects of photocatalytic time,amount of photocatalyst and initial concentration of Rhodamine B on the degradation rate were investigated at the same time.The results show that the prepared BiVO_(4)is a nano particle with an average particle size of about 50-70nm and good intergranular dispersion.The results of photocatalytic experiments show that the concentration of Rhodamine B solution decreased with the increase of light time,and the photocatalytic effect of BiVO_(4) was better than that of blank sample.When the initial concentration of Rhodamine B solution is 40 mg·L^(-1),the photocatalysis time is 200 mins.The amount of photocatalyst is 5 g·L^(-1).The photocatalytic degradation rate can be as high as maximum of 93%.