Z型CuBi_(2)O_(4)/BiOBr异质结高效光催化降解阿莫西林及RhB-MB

Efficient Photocatalytic Degradation of Amoxicillin and RhB-MB in Z-Type CuBi_(2)O_(4)/BiOBr Heterojunction

采用水热法合成了CuBi_(2)O_(4)、BiOBr和不同摩尔比的CuBi_(2)O_(4)/BiOBr复合光催化剂,利用XRD、XPS、SEM、UV-Vis、BET、EIS等测试手段对催化剂的结构、形貌和光催化性能进行了表征。CuBi_(2)O_(4)/BiOBr异质结的构建显著地提高了光生电子空穴的分离效率,增强了光催化活性。在可见光照射下,20%CuBi_(2)O_(4)/BiOBr在60 min内降解95%的阿莫西林(50 mL,10 mg/L)。探究了复合催化剂对RhB-MB双模拟污染物降解的光催化活性,结果表明:在多种污染物同时存在下,复合催化剂仍然表现出较好的光催化性能。根据活性物种捕获试验和催化剂的导带价带位置,提出了CuBi_(2)O_(4)/BiOBr异质结光催化过程可能的机理。

CuBi_(2)O_(4),BiOBr and CuBi_(2)O_(4)/BiOBr composite photocatalyst with different mole ratios were synthesized by hydrothermal method.The structure,morphology and properties of the as-prepared catalysts were characterized by XRD,XPS,SEM,UV-Vis,BET,EIS and other testing techniques.The construction of Z-type heterojunction significantly improves the separation efficiency of electron holes and enhances the photocatalytic activity.Under visible light radiation,95%amoxicillin can be degraded by 20%CuBi_(2)O_(4)/BiOBr photocatalyst within 60 min.In addition,the photocatalytic degradation activity of 20%CuBi_(2)O_(4)/BiOBr for RhB-MB double pollutants was also explored.The experimental results show that the composite catalyst still exhibited a good photocatalytic performance under the condition of multiple pollutants co-existing system.According to the results of active species captured experiment,and the potential value of the conduction band and valence band of the catalyst,the possible mechanism of the photocatalytic degradation for organic pollutions over CuBi_(2)O_(4)/BiOBr was proposed.