三维有序大孔复合材料AgZnO-TiO2的制备及微波辅助光催化性能

采用聚苯乙烯(PS)微球作为模板剂，经溶胶-凝胶及煅烧后处理等方法制备了三维有序大孔复合材料Ag/ZnO-TiO2. 通过傅里叶-红外光谱(FT-IR)、X 射线衍射(XRD)、X 射线光电子能谱(XPS) 、N2吸附-脱附测定和扫描电子显微镜配合X 射线能量色谱仪(SEM-EDS)等测试手段对其组成、结构及形貌等进行了表征. 结果显示，经PS微球处理后的Ag/ZnO-TiO2具有锐钛矿晶型结构，其Ag以单质形式存在. 该复合材料的孔结构排列整齐有序，孔壁为介孔结构，粒子堆积致密，平均孔直径约150 nm，属于三维有序大孔材料(3DOM). 在微波辅助光催化降解甲基橙等染料的实验研究中，该复合材料表现出较好的光催化性能，其活性明显高于P25等单体以及二元体系ZnO-TiO2

Preparation of 3DOM Periodic Composite Ag/ZnO-TiO2 and Microwave-assisted Photocatalytic Performance

Three-dimensionally ordered macroporous composite Ag/ZnO-TiO2 was prepared by the sol-gel method combined with a polystyrene (PS) latex sphere templating technique and calcined. The phase structures, chemical composition, optical absorption properties and surface physicochemical properties were well-characterized via a Fourier transform infrared (FT-IR) spectrum, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Transmission electron microscopy (TEM), N2 adsorption-desorption tests and scanning electron microscopy assisted X-ray energy dispersive spectroscopy (SEM-EDS). Results showed that produced composite Ag/ZnO-TiO2, which by using polystyrene (PS) latex sphere, had anatase crystalline structre, well distribution, good struction and the silver species in the Ag/ZnO-TiO2 was metallic Ag. Moreover, the walls structure of the 3DOMAg/ZnO-TiO2 was mesoporous with compact walls, and the average pore diameters were ca.150 nm, which were three-dimensional ordered macroporous materials (3DOM). The photocatalytic activities of Ag/ZnO-TiO2 were tested by microwave assisted photocatalytic degradation of the dyes, for example, methyl orange. Results showed that this composite material had fine photocatalytic activities for many dyes, and the activity was higher than that of P25 and binary system ZnO-TiO2