ZnO/Ag_(2)MoO_(4)复合材料的制备及其光催化性能  

Preparation and Photocatalytic Properties of ZnO/Ag_(2)MoO_(4)Composites

作　　者：杨玉婷 张莹莹 董庆桐 陈全亮 YANG Yuting;ZHANG Yingying;DONG Qingtong;CHEN Quanliang(State Key Laboratory of Chemical and Environmental Functional Materials for Pollution Control on Qinghai-Tibet Platea,Southwest University for Nationalities,Chengdu,Sichuan 610041)

机构地区：[1]西南民族大学化学与环境学院,青藏高原污染控制化学与环境功能材料国家民委重点实验室,四川成都610041

出　　处：《硅酸盐学报》2024年第12期3737-3747,共11页Journal of The Chinese Ceramic Society

基　　金：西南民族大学中央高校基本科研业务费(ZYN2024019)。

摘　　要：污水中的有机染料罗丹明B和非甾体类药物美洛昔康对生物体具有较大危害,采用光催化技术处理有机污染物具有节能环保等潜在优势。通过水热法制备了新型ZnO/Ag_(2)MoO_(4)复合光催化剂,并利用红外光谱、X射线粉末衍射、扫描电子显微镜、X射线光电子能谱等技术对催化剂的组成、结构和形貌进行表征。结果表明:ZnO/Ag_(2)MoO_(4)复合催化剂最小尺寸为100~200 nm,ZnO以棱柱状沉积在Ag_(2)Mo O_(4)表面。ZnO/Ag_(2)MoO_(4)复合催化剂对有机染料和药物都具有良好的光催化降解活性。在最优反应条件下,复合催化剂对罗丹明B的降解率可达95.0%,对药物美洛昔康的降解率达80.6%。复合催化剂降解罗丹明B的最大反应速率常数分别是ZnO和Ag_(2)MoO_(4)速率常数的3倍和16倍。Ag_(2)MoO_(4)和ZnO复合后光催化活性的提高归因于复合后光生载流子分离效率的提高,可见光吸收强度的增加,带隙宽度的缩小和活性位点的增加。催化剂的循环实验表明ZnO/Ag_(2)MoO_(4)复合催化剂具有良好的光学稳定性。研究结果为水污染治理光催化剂的开发设计提供了有益的参考。Introduction With the increasing environmental protection and sustainable development,conventional water pollution treatment methods have some challenges in practical applications.Photocatalytic technology has potential advantages such as energy conservation and environmental protection,providing an effective and sustainable method for wastewater treatment.The design and synthesis of photocatalysts are crucial in photocatalytic reactions.Silver molybdate material has some advantages of controllable morphology,unique physicochemical properties,having potential application prospects.However,the narrow photoresponse range and the high recombination efficiency of photo generated charge carriers restrict its application in the field of photocatalysis.In this study,a ZnO/Ag_(2)MoO_(4)composite photocatalyst was prepared by a hydrothermal method with ZnO.The purpose was to improve the photocatalytic activity of silver molybdate via constructing heterojunctions.The photocatalytic performance of different proportions of composite materials for the degradation of organic pollutants was investigated.In addition,the optical stability of the catalyst and the active free radicals involved in the reaction were also analyzed.Methods Zn O/Ag_(2)MoO_(4)composite catalysts with different mass fractions of 10%,50%,and 90%ZnO were synthesized by a hydrothermal method with ZnO,AgNO_(3),and Na_(2)MoO_(4)·2H_(2)O,respectively.The photocatalytic degradation of organic pollutants was carried out in a photocatalytic reactor.50 mg of photocatalyst was dispersed in 50 mL of Rhodamine B(RhB)or meloxicam(MLX)solution in each experiment.Prior to photocatalytic reaction,the suspension was stirred in the darkness for 30 min to obtain the absorption-desorption equilibrium.Afterwards,the suspension was placed under a xenon lamp(300 W)for photocatalytic degradation.At each interval,RhB or MLX solution with catalyst was sampled and centrifuged to remove the solid catalyst.The concentration of RhB or MLX was determined by a UV-Vis spectrophotometer.T

关 键 词：钼酸银 氧化锌 罗丹明B 美洛昔康 光催化 

分 类 号：O643.3[理学—物理化学]