【摘要】 以聚乙烯吡咯烷酮(PVP)为还原剂及稳定剂,在温控条件(7)(21)(15)℃(8)下制备了纳米银-石墨烯(7)(32)g-RGO(8)复合材料。采用X射线粉末衍射、透射电镜、紫外-可见吸收光谱、拉曼光谱、光电子能谱、红外光谱等对该复合材料的结构及形貌进行了表征。结果表明,RGO表面所负载的纳米(32)g粒子尺寸小,分散性好,与RGO结合牢固。以酸性橙(22)(7)(32)(46)(22)(8)为目标污染物,进行了可见光光催化活性测试。结果显示,样品(15)(13)(17)(32)g-RGO可在(16)(17)(15)min内将(32)(46)(22)降解完全。活性物种捕获实验揭示(32)g-RGO对(32)(46)(22)的高效降解源自(32)g纳米粒子的表面等离子共振及RGO快速传导电子的协同效应。更多还原

【Abstract】 Ag-graphene composites(Ag-RGO) were prepared using poly(N-vinyl-2-pyrrolidone)(PVP) as reductant and stabilizer under 60 °C reaction conditions.The synthesized Ag-RGO were characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),UV-vis absorption spectra,X-ray photoelectron spectroscopy(XPS),and Fourier transform infrared spectroscopy(FT-IR).The results show that Ag nanoparticles with small-size and excellent dispersion are anchored firmly on RGO sheet.The photocatalytic activity was evaluated by oxidation of AO7 under visible light irradiation.AO7 could be almost degraded completely within 120 min by 0.2Ag-RGO sample.The origin of high photocatalytic activity of Ag-RGO was discussed;it is mainly ascribed to the surface plasma resonance effect of Ag nanoparticles in Ag-RGO composites.In addition,RGO acts as electron transmission channels.The synergistic effects induced by RGO also contribute to the high photocatalytic activity.更多还原