论文部分内容阅读
采用P123(EO20PO70EO20)作模板剂,通过溶胶-凝胶-程序升温溶剂热一步法,并经煅烧和萃取两种不同的后处理方法制备了一系列具有光催化活性的纳米复合材料Ag/TiO2-ZrO2。经XRD、XPS、TEM、N2吸附-脱附测定测试手段对不同钛锆比例和不同后处理获得样品的组成、结构及形貌等进行了对比分析,获得了最佳光催化材料Ag/TiO2-ZrO2-C(3∶1)。该复合材料结晶度高、结构规整、呈四方体形、颗粒分布均匀,具有较均匀的孔结构,其银以单质形式存在,且均匀分散在TiO2-ZrO2表面。通过微波辅助光催化降解染料甲基橙的实验,对不同处理方法所获Ag/TiO2-ZrO2的光催化活性进行了探究。实验结果表明,通过煅烧后处理方法得到的催化剂具有最好光催化活性,在90 min内降解率高达94.0%,其活性高于市售P25、TiO2-ZrO2和Ag/TiO2-ZrO2-E(3∶1)。
P123 (EO20PO70EO20) was used as a template to prepare a series of photocatalytic nanocomposites Ag / TiO2-TiO2 by sol-gel-temperature-programmed solvothermal one-step calcination and extraction of two different post- ZrO2. The composition, structure and morphology of samples obtained by different ratios of titanium and zirconium and different post-treatment were analyzed by XRD, XPS, TEM and N2 adsorption-desorption test. The best photocatalytic material Ag / TiO2- ZrO2-C (3: 1). The composite material has high crystallinity, regular structure, a square shape, uniform particle distribution and uniform pore structure. The silver exists in the form of simple substance and is evenly dispersed on the surface of the TiO2-ZrO2. The photocatalytic activity of Ag / TiO2-ZrO2 obtained by different treatment methods was investigated by microwave assisted photocatalytic degradation of methyl orange. The experimental results show that the catalyst obtained by calcination treatment has the best photocatalytic activity, the degradation rate reaches 94.0% within 90 min, and its activity is higher than that of P25, TiO2-ZrO2 and Ag / TiO2-ZrO2-E : 1).