Ag-Ag2O/TiO2-g-C3N4纳米复合材料的制备及可见光催化性能  

Preparation and photocatalytic properties of Ag-Ag2O/TiO2-g-C3N4 nanocomposites

作　　者：胡金娟 马春雨 王佳琳 王宁 秦福文 张庆瑜 HU Jinjuan;MA Chunyu;WANG Jialin;WANG Ning;QIN Fuwen;ZHANG Qingyu(Key Laboratory of Materials Modification by Laser,Ion and Electron Beams,School of Physics,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学物理学院三束材料改性教育部重点实验室,大连116024

出　　处：《复合材料学报》2020年第6期1401-1410,共10页Acta Materiae Compositae Sinica

基　　金：中央高校基本科研业务费专项资金(DUT19LAB14)。

摘　　要：近年来,半导体光催化技术作为一项快速发展的新型环保技术,在降解水体中污染物和可再生清洁能源的生产领域有很大的应用前景。本文以所制备出的20 wt%类石墨烯碳氮化合物(g-C3N4)/TiO2为基质,利用水热法中纳米Ag颗粒部分氧化行为成功合成了Ag修饰异质结型Ag-Ag2O/TiO2-g-C3N4复合材料。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-Vis DRS)、光致荧光光谱(PL)、瞬态光电流响应等分析测试手段对Ag-Ag2O/TiO2-g-C3N4复合材料的晶体结构、形貌、光学性质等进行表征和分析。以亚甲基蓝溶液为目标降解物,研究了Ag-Ag2O/TiO2-g-C3N4复合材料的可见光催化性能。结果表明:在纳米Ag颗粒修饰的Ag-Ag2O/TiO2-g-C3N4复合材料中,Ag部分氧化成Ag2O;与g-C3N4的协同作用使Ag-Ag2O/TiO2-g-C3N4复合催化剂具有良好的可见光催化活性;可见光照射4 h后,AgAg2O/TiO2-g-C3N4复合催化剂对亚甲基蓝的降解率接近50%。In recent years,semiconductor photocatalysis technology as a fast-developing environmental technology,has great application prospects in degradation of pollutants in water and production of renewable clean energy.In this paper,Ag-modified Ag-Ag2O/TiO2-graphitic carbon nitride(g-C3N4)heterojunction composites,which were based on the prepared 20 wt%g-C3N4/TiO2 composites,were successfully synthesized by partially oxidizing nano-Ag particles during the hydrothermal process.X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS),photoluminescence spectroscopy(PL)and transient photocurrent analytical tests were used to characterize and analyze the crystal structure,morphology and optical properties of Ag-Ag2O/TiO2-g-C3N4 photocatalysts.The photocatalytic activity of the Ag-Ag2O/TiO2-g-C3N4 was also investigated through degradation of methylene blue(MB)under visible light irradiation.It is found that Ag is partially oxidized to Ag2O,and their synergistic effects with g-C3N4 make the Ag-Ag2O/TiO2-g-C3N4 composites have good visible light photocatalytic activity.After 4 h of visible light irradiation,the degradation rate of MB by the Ag-Ag2O/TiO2-g-C3N4 photocatalyst is close to 50%.

关 键 词：g-C3N4/TiO2 AG2O 贵金属 异质结 可见光催化 

分 类 号：O643.36[理学—物理化学] TQ340.64[理学—化学]