Ag/Ag_(2)MoO_(4)/Bi_(2)MoO_(6)复合光催化剂的制备及其光催化性能

Preparation and Photocatalytic Activity of Ag/Ag_(2)MoO_(4)/Bi_(2)MoO_(6)Composite Photocatalyst

采用水热、化学沉积和原位光还原的方法成功制备了新型Ag/Ag_(2)MoO_(4)/Bi_(2)MoO_(6)三元复合光催化剂。通过X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和紫外可见漫反射光谱(UV-Vis DRS)等技术对材料的组成、形貌、光吸收特性和光电化学性能等进行系统分析。以四环素为目标污染物,研究Ag/Ag_(2)MoO_(4)/Bi_(2)MoO_(6)在可见光下的光催化性能。研究结果表明,相比于纯Ag_(2)MoO_(4)和Bi_(2)MoO_(6),Ag的表面等离子体共振(SPR)效应显著拓宽了催化体系对可见光的吸收能力及响应范围。当Ag_(2)MoO_(4)理论负载量(质量分数)为24.6%时,Ag/Ag_(2)MoO_(4)/Bi_(2)MoO_(6)复合材料在20 min内可将四环素完全降解,且5次循环使用后仍保持较高的催化活性,表现出良好的循环稳定性。

A novel Ag/Ag_(2)MoO_(4)/Bi_(2)MoO_(6)ternary photocatalyst was successfully prepared by hydrothermal,chemical deposition and in-situ photoreduction process.The as-prepared photocatalysts were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS)and UV-visible diffuse reflection spectroscopy(UV-Vis DRS)to investigate the composition,morphology,optical absorption characteristics and photoelectrochemical properties.The photocatalytic performance of Ag/Ag_(2)MoO_(4)/Bi_(2)MoO_(6)photocatalyst was evaluated with tetracycline as the target pollutant under visible light.The research results show that,compared with pure Ag_(2)MoO_(4)and Bi_(2)MoO_(6),the surface plasmon resonance(SPR)effect of Ag significantly broadens the visible light absorption capacity and response range of the catalytic system.When the theoretical loading(mass fraction)of Ag_(2)MoO_(4)was 24.6%,Ag/Ag_(2)MoO_(4)/Bi_(2)MoO_(6)ternary photocatalyst could completely degrade tetracycline within 20 min,and maintained high catalytic activity after 5 cycles of use,showing good cycle stability.