Synthesis of Ag-loaded CuO-ZnO Nanocomposites by a Facile Sol-Gel Method for Enhanced Photocatalytic Activity
HU Wenyu, WANG Xiaoyi, YUAN Huan, LIU Yutong, CHEN Yu, ZHANG Qiuping, ZHANG Jiaxi, LUO Kaiyi, LI Jing, XU Ming
Key Laboratory of Information Materials of Sichuan Province, School of Electrical and Information Engineering, Southwest Minzu University, Chengdu 610041, China
Abstract: Photocatalytic degradation of water pollution by solar energy is a reliable way for environment remediation with minimum associated costs. However, developing a photocatalytic system with high performance, recyclability and low cost has become a practical problem due to the complexity of photodegradation process. We demonstrated a Ag-loaded CuO-ZnO nano-photocatalysts by a facile sol-gel method, the CuO-ZnO structure was obtained by doping with high concentration of Cu ions.The samples were characterized by a variety of test methods. XRD confirmed the presence of CuO and Ag. SEM showed that the morphology of ZnO particles was affected by Ag deposition. XPS showed that Ag deposition affected the transition from Cu2+ to Cu+. Under the simulated sunlight and ultraviolet light, small trace(2mol%) of Ag modified CuO-ZnO exhibited higher photocatalytic activity than that of the unmodified sample in the photocatalytic degradation of methylene blue (MB) and methyl orange (MO) aqueous solutions of organic pollutants. The improvement of photocatalytic performance is mainly attributed to the enhancement of visible light utilization, effective separation of photogenic charge, optimization of morphology and structure, and conversion of surface chemical states, the ternary composite photocatalytic system providing an effective way for water pollution restoration by its excellent photocatalytic performance, low precious metal usage and recyclability.
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2020, Vol. 34 
