Ag/AgCl/ZnO催化剂的制备及光催化性能的研究

Preparation of Ag/AgCl/ZnO and Study on Its Photocatalytic Performance

以沸石咪唑骨架ZIF-8为前驱体,空气气氛中煅烧制备ZnO,然后通过沉积沉淀–光还原方法将Ag/AgCl与ZnO复合,制备出Ag/AgCl/ZnO可见光催化剂。利用FT-IR、XRD、SEM、N2吸附和XPS测试技术对该催化剂进行了表征。实验结果表明:将Ag/AgCl引入到ZnO中,使催化剂在可见光区有强烈的光吸收。SEM和N2吸附测试结果表明,不同的煅烧温度,ZnO呈现出不一样的形貌,且随着煅烧温度的增加,Ag/AgCl/ZnO催化剂的比表面积显著降低,600℃为最佳煅烧温度。催化剂制备的最佳光照时间是6 h,最佳Ag负载量是5.3(w)%,在此条件下,70 mL 20 mg/L的罗丹明B溶液在60 min内几乎被完全降解,并且催化剂具有良好的重复使用性。

ZnO was prepared by calcining Zeolitic Imidazolate Frameworks ZIF-8 at suitable temperature in air, and the plasmonic Ag/AgCl/ZnO catalyst was prepared by the deposition-precipitation- photore-duction method. The photocatalyst was characterized by FT-IR, XRD, SEM, N2 adsorption-desorption and XPS techniques. It was found that ZnO exhibits different morphologies at different calcination temperatures, and the specific surface area of Ag/AgCl/ZnO catalyst decreases with increasing cal-cination temperature. Moreover, Ag/AgCl/ZnO photocatalyst showed strong light absorption in the visible region and 70 mL of 20 mg/L RhB is completely degraded within 60 min under the condition that the optimal illumination time for the preparation of the catalyst is 6 h, the appropriate calcina-tion temperature is 600˚C and the optimum silver loading is 5.3(w)%.