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采用EO20PO70EO20(P123)作为模板剂,通过溶胶-凝胶-程序升温溶剂热一步法并经不同时间微波辐射处理,制备了一系列纳米复合材料Ag/TiO2。采用XRD、XPS、TEM、N2吸附-脱附测定和SEM-EDS等测试手段对其组成、结构及形貌等进行表征。结果显示,微波辐射5min制备的Ag/TiO2晶型结构最佳,该产物中Ag以单质形式存在,其比表面积可达100.64m2·g-1,平均孔径约为6.9nm。与未经微波辐射样品相比,其颗粒细小、结构规则、分布均匀、无明显团聚现象。以甲基橙为模型分子,考察经不同时间微波辐射处理的纳米复合材料Ag/TiO2的紫外光催化活性。结果表明,在微波功率为200W,微波时间为5min时获得的Ag/TiO2的催化活性最高,循环使用3次后降解率仍能达到80%以上。
A series of nanocomposites Ag / TiO2 were prepared by sol-gel-temperature-programmed solvothermal one-step sol-gel method and microwave radiation treatment with EO20PO70EO20 (P123) as templating agent. Its composition, structure and morphology were characterized by XRD, XPS, TEM, N2 adsorption-desorption and SEM-EDS. The results showed that the crystal structure of Ag / TiO2 prepared by microwave irradiation for 5 min was the best. The Ag was present in the form of elemental substance. The specific surface area of Ag / TiO2 was 100.64 m2 · g-1 and the average pore size was about 6.9 nm. Compared with the non-microwave radiation samples, the particles are small, regular structure, uniform distribution, no obvious agglomeration phenomenon. Using methyl orange as a model molecule, the photocatalytic activity of Ag / TiO2 nanocomposites treated by microwave radiation at different time was investigated. The results showed that the catalytic activity of Ag / TiO2 was the highest when the microwave power was 200W and the microwave time was 5min. After 3 cycles, the degradation rate of Ag / TiO2 could reach more than 80%.