Chen Hongmei, Xue Chenyang, Cui Danfeng, Liu Maoxing, Chen Yi, Li Yuankai, Zhang Wendong
Science and Technology on Electronic Test and Measurement Laboratory, North University of China Taiyuan Shanxi 030051 China
Department of Mathematics, Qingdao University of Science and Technology Qingdao 266061 China.
RSC Adv. 2020 Apr 17;10(26):15245-15251. doi: 10.1039/c9ra10437b. eCollection 2020 Apr 16.
In this paper, a series of CoO-Ag photocatalysts with different Ag loadings were synthesized by facile hydrothermal and photoreduction methods and fully characterized by XRD, SEM, TEM, FTIR spectroscopy, XPS, UV-vis and PL techniques. The catalysts were used for the degradation of methyl orange (MO). Compared with the pure CoO catalyst, the CoO-Ag catalysts showed better activity; among these, the CoO-Ag-0.3 catalyst demonstrated the most efficient activity with 96.4% degradation efficiency after 30 h UV light irradiation and high degradation efficiency of 99.1% after 6 h visible light irradiation. According to the corresponding dynamics study under UV light irradiation, the photocatalytic efficiency of CoO-Ag-0.3 was 2.72 times higher than that of CoO under identical reaction conditions. The excellent photocatalytic activity of CoO-Ag can be attributed to the synergistic effect of strong absorption under UV and visible light, reduced photoelectron and hole recombination rate, and decreased band gap due to Ag doping. Additionally, a possible reaction mechanism over the CoO-Ag photocatalysts was proposed and explained.
本文采用简便的水热法和光还原法合成了一系列不同Ag负载量的CoO-Ag光催化剂，并通过XRD、SEM、TEM、FTIR光谱、XPS、UV-vis和PL技术对其进行了全面表征。将这些催化剂用于甲基橙（MO）的降解。与纯CoO催化剂相比，CoO-Ag催化剂表现出更好的活性；其中，CoO-Ag-0.3催化剂表现出最高的活性，在紫外光照射30 h后降解效率达到96.4%，在可见光照射6 h后降解效率高达99.1%。根据紫外光照射下的相应动力学研究，在相同反应条件下，CoO-Ag-0.3的光催化效率比CoO高2.72倍。CoO-Ag优异的光催化活性可归因于其在紫外光和可见光下的强吸收协同效应、光电子和空穴复合率的降低以及由于Ag掺杂导致的带隙减小。此外，还提出并解释了CoO-Ag光催化剂上可能的反应机理。
