Facile Synthesis and Study of High-efficiency Mn/ZnO-Ag Nano-composite Photocatalytic System
LI Jing, LUO Kaiyi, HU Wenyu, LIU Yutong, YUAN Huan, ZHANG Qiuping, WANG Xiaoyi, XU Ming
Key Laboratory of Information Materials of Sichuan Province, School of Electrical and Information Engineering, Southwest Minzu University, Chengdu 610041,China
Abstract: We demonstrated the Mn doped ZnO (Mn/ZnO) and (Mn, Ag) co-doped ZnO photocatalyst with different Mn concentrations, both samples were fabricated by facile polymer network gel method. The photocatalytic activity of the samples were characterized by the degradation of methylene blue (MB) pollutant under the simulated sunlight illumination. XRD and SEM identified that Mn doping decreased the grain size, but improved the particle distribution of the sample. XPS spectra showed the Mn2+ and Mn3+ valence states coexisted in the samples, the ratio of Mn3+/Mn2+ was raised with the increase of Mn doping amount. Comparing with pure ZnO nano-particles, the Mn/ZnO-Ag nano-particles depicted a weaker luminescence intensity, and the most effective photogenerated charge separation was emerged when Mn doping concentration reached 1mol%. The results manifested the Mn doping could significantly enhance the optical absorption in visible region, however, no significant increases of Mn doped ZnO photocatalytic activity were observed in the first order kinetic function. the Mn/ZnO-Ag simples demonstrated outstanding perfromance of photocatalytic activity while maintaining excellent optical performance. In the combination of characterization results, the improvement of photocatalytic activity of the samples was strongly influenced by the enhancement of visible utilization, the change of valence state between Mn ions and the synergy between Mn ions and Ag particles. This study provides a useful pathway to systematically enhance the photocatalytic activity of ZnO.
李靖, 罗凯怡, 胡文宇, 刘禹彤, 袁欢, 张秋平, 王笑乙, 徐明. 高效Mn/ZnO-Ag纳米复合光催化体系的简易制备及研究[J]. 材料导报, 2021, 35(4): 4017-4022.
LI Jing, LUO Kaiyi, HU Wenyu, LIU Yutong, YUAN Huan, ZHANG Qiuping, WANG Xiaoyi, XU Ming. Facile Synthesis and Study of High-efficiency Mn/ZnO-Ag Nano-composite Photocatalytic System. Materials Reports, 2021, 35(4): 4017-4022.
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2021, Vol. 35 
