不同后处理方法制备纳米复合材料Ag/TiO2-ZrO2及其微波辅助光催化甲基橙

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)。

Preparation of Ag/TiO2-ZrO2 nano-composite with different post processing methods and microwave-assisted photocatalytic activity of methyl orange

In this paper,the nano-composite Ag/TiO2-ZrO2 with a high photocatalytic activity was prepared by the sol-gel method combined with temperature-programmed treatment in the presence of a triblock copolymer surfactant P123(EO20PO70EO20),and different post-processing methods of calcination or extraction in ethanol solution was used.At the same time,the phase composition,structures and morphologies of the nano-composite Ag/TiO2-ZrO2 were well-characterized via X-ray diffraction(XRD) patterns,X-ray photoelectron spectra(XPS),transmission electron microscope(TEM),and N2 adsorption-desorption tests,by which the best catalyst that was Ag/TiO2-ZrO2-C(3∶1)was found,in which silver species was metallic Ag0,and the composite had good structure and an orderly distribution of particles.The photocatalytic degradation of methyl orange with Ag/TiO2-ZrO2 assisted by microwave in aqueous solution was done to investigate the chemical properties and catalytic activity.The results showed that Ag/TiO2-ZrO2 by calcination was more efficient,and the degradation ratio of methyl orange was 94.0% within 90 min,moreover,which was higher than those of Degussa P25,TiO2-ZrO2 and Ag/TiO2-ZrO2-E(3∶1).