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.
出处
《华侨大学学报（自然科学版）》
CAS
北大核心
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)
关键词
AG2O
AG
可见光
光催化
水热法
Ag2O
Ag
visible light
photoeatalysis
hydrothermal method
