在模板剂溴化十六烷基三甲基胺(CTAB)的辅助作用下,按nAg∶ nzn∶nTi=0.1∶2∶1的物质的量的比,采用溶胶-凝胶再结合程序升温溶剂热法制备了一系列纳米复合材料Ag/ZnO-TiO2(CTAB),并经X射线衍射(XRD)、紫外-可见漫反射吸收光谱(UV-Vis/DRS) 、X射线光电子能谱(XPS)、透射电子显微镜(TEM)、扫描电子显微镜配合X射线能量色散谱仪(SEM-EDS)和N2吸附-脱附测定等测试手段对不同温度(500、600、700℃)和不同时间(5、7 h)下煅烧得到各产物的组成、结构及形貌等进行了表征.结果表明,该系列复合材料不仅含有ZnO纤锌矿和TiO2锐钛矿结构,同时有部分Zn2TiO4生成,其Ag还以单质形式存在.在CTAB作用下改变煅烧温度和时间可使各产物分别呈现纳米线、纳米球等多种形态,且颗粒分布较均匀.上述各复合材料在紫外光作用下对罗丹明B(RB)的光催化降解结果显示,样品煅烧温度和煅烧时间不同,其活性会发生明显的变化.%The nano-composites Ag/ZnO-TiO2 under cetyltrimethylammonium bromide (CTAB) were prepared with molar ratio of 0.1:2:1 about Ag:Zn:Ti by the sol-gel method combined with temperature-programmed treatment. The phase composition, structures and morphologies of the nano-composite Ag/ZnO-TiO2 by post-processing methods of calcination at different temperature (500, 600, 700 ℃) and time (5 h, 7 h) were well-characterized by X-ray diffraction (XRD), and UV-visible diffuse reflectance spectrometer (UV-Vis/DRS), and X-ray photoelectron spectroscopy(XPS), and Transmission electron microscopy(TEM), and Scanning electron microscopy combined with X-ray energy dispersive spectroscopy (SEM-EDS) and N2 adsorption-desorption measurement. Results showed that a series of composites had not only the ZnO wurtzite and TiO2 anatase structures, meanwhile, part Zn2TiO4 were generated and silver species existing in the nano-composite Ag/ZnO-TiO2 was metallic Ag°. By the method changed calcination temperature and time, different nano-composites Ag/ZnO-TiO2 (CTAB) showed nanowires and nano-ball morphology, moreover, which were uniformly distribution. By the photocatalytic degradation of RB, under UV light irradiation, the results showed that the activities of sample calcined at different time and temperature were obvious distinction.
展开▼
