Ag_2O光催化过程中单质Ag的生成及作用机理  

Study on Effect and Mechanism of Metallic Ag in the Photocatalytic Process by Ag_2O

作　　者：陈亦琳[1] 陈林峰[1] 

机构地区：[1]华侨大学材料科学与工程学院,福建泉州362021

出　　处：《华侨大学学报（自然科学版）》2011年第6期652-656,共5页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(21003055);华侨大学高层次人才科研启动项目(06BS213)

摘　　要：采用水热法制备Ag2O光催化剂.利用X射线粉末衍射、扫描电镜、紫外-可见漫反射光谱、表面光电压谱对样品的晶型、形貌、光吸收及光伏响应特性进行表征,并以亚甲基兰(MB)为模型污染物,考察Ag2O在可见光(λ>420nm)照射下的催化氧化行为.结果表明:Ag2O样品由粒径为2～5μm的Ag2O颗粒组成,能带带隙1.35eV,有显著的可见光光伏响应特征;光催化反应30min后,Ag2O颗粒表面均匀附着直径0.1～0.5μm的Ag颗粒.重复性实验说明,光催化反应过程中,单质Ag的原位生成是Ag2O保持良好活性和稳定性的主要原因.Silver oxide photocatalyst, Ag2O, was synthesized by a hydrothermal method in this work. The as-prepared product was characterized by X-ray powder diffraction（XRD）, scanning electron microscopy（SEM）, UV-Vis diffuse reflectance spectra（DRS） and surface photovoltage spectroscopy（SPS）. The results indicated the microzyme-like Ag2O with optical bandgap of 1.35 eV is comprised of particles with diameters of 2-5 μn. The photocatalytic activity was investigated by decomposing methylene blue（MB） under visible light irradiation. Metallic Ag particles with diameters of 0. 1-0. 5 μm were deposited on Ag2O after 0. 5 h irradiation. The repetitive tests showed that the high efficient and stable performance of Ag2O are chiefly attributed to the generation of metallic Ag in the photocatalytic process.

关 键 词：AG2O AG 可见光 光催化 水热法 

分 类 号：O643[理学—物理化学]