H_(2)O_(2)协同提高单斜晶相M-BiVO_(4)可见光催化性能的研究

Research on H_(2)O_(2) synergistically improve visible light photocatalytic performance of M-BiVO_(4)

采用简单的水热法制备了单斜晶相钒酸铋(M-BiVO_(4)),通过X射线衍射仪,扫描电子显微镜等对其物质组成和结构形貌进行表征。在M-BiVO_(4)中加入H_(2)O_(2)组成协同光催化体系,以亚甲基蓝(MB)为降解目标,研究两者的协同作用机理。结果表明,H_(2)O_(2)添加量为2.2mL时,M-BiVO_(4)与H_(2)O_(2)构成的协同光催化体系(M-BiVO_(4)+H_(2)O_(2))在可见光照射2.5h对MB的降解率最高可达88.4%,M-BiVO_(4)+H_(2)O_(2)协同光催化体系催化性能提高的原因除了H_(2)O_(2)具有强氧化性外,H_(2)O_(2)还是优良的电子捕获剂,可以有效抑制光生电子-空穴对的复合。

Monoclinic bismuth vanadate(M-BiVO_(4))was prepared by simple hydrothermal method,and its material composition and structure were characterized by X-ray diffractometer and scanning electron microscope.H_(2)O_(2)was added to M-BiVO_(4)to form a cooperative photocatalytic system,and methylene blue(MB)was used as the degradation target to study the synergistic mechanism.The results showed that H_(2)O_(2)content of 2.2mL,the collaborative photocatalytic system was composed by M-BiVO_(4)with H_(2)O_(2)(M-BiVO_(4)+H_(2)O_(2)),MB degradation rate was up to 88.4%in the visible light irradiation 2.5h.The M-BiVO_(4)+H_(2)O_(2)synergy photocatalytic system improved the performance,which reasons besides H_(2)O_(2)had strong oxidizing,its also was excellent electronic capture agent that can effectively restrained light electronic-hole of the compound.