摘要
通过简单的低温水浴法成功制备了系列Ag/AgBr/BiOBr复合光催化剂,对其结构、形貌和性能进行了表征.相较于BiOBr和Ag/AgBr,可见光下该系列复合物均表现出优异的光催化降解四环素(TC)的活性.其中,1∶5 Ag/AgBr/BiOBr(20%)仅在24 min内即可完全降解TC,降解速率常数最高(k=0.20 min^(-1)).在银的SPR效应的辅助下,大量的h^(+),·OH活性物种以及O_(2)/·O^(-)_(2)和Br-/Br^(0)的氧化还原反应提升了复合物的光催化活性.活性物种捕获实验显示,·OH和h^(+)是该体系的主要活性物种,并提出了可能的光催化反应机制.
A series of Ag/AgBr/BiOBr photocatalysts with different weight content of Ag/AgBr were successfully constructed via a simple precipitation method in 80°C water bath.The photocatalysts were characterized by XRD,XPS,SEM,TEM,N_(2)adsorption-desorption(BET)and UV-Vis diffuse reflectance spectroscopy(DRS).Compared with BiOBr and Ag/AgBr,all the composite photocatalysts showed the prominent photocatalytic activity for the degradation of tetracycline(TC).Especially,1∶5 Ag/AgBr/BiOBr(20%)had the highest reaction rate constant(k=0.20 min^(-1)).Due to surface plasmon resonance(SPR)effect of Ag^(0),abundant h^(+)and·OH active species participate in degradation of pollutants.Further,electrons and holes could participate in O_(2)/·O^(-)_(2)and Br-/Br_(0) reactions,respectively,promoting the separation and transfer of electron-hole pairs and enhancing the photocatalytic activity of Ag/AgBr/BiOBr.Moreover,according to the results of radical scavengers runs,·OH and h^(+)acted as the main reactive species in the degradation process.A possible photocatalytic mechanism for tetracycline degradation over Ag/AgBr/BiOBr was proposed.
作者
宋继梅
朱婉蓉
杨捷
裴泽平
徐嘉宋
王超凡
刘聪
SONG Jimei;ZHU Wanrong;YANG Jie;PEI Zeping;XU Jiasong;WANG Chaofan;LIU Cong(School of Chemistry and Chemical Engineering,Anhui University,Hefei 230601,China)
出处
《安徽大学学报（自然科学版）》
CAS
北大核心
2022年第5期71-82,共12页
Journal of Anhui University(Natural Science Edition)
基金
国家自然科学基金资助项目(21171002)。
