中文摘要：

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0．1～0．5／zm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．

英文摘要：

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.