介孔Ag/CeO_(2)材料结构及湿式催化氧化性能研究

Study on the structure and wet catalytic oxidation performance of mesoporous Ag/CeO_(2) materials

以硝酸铈、硝酸银为原料,嵌段聚合物F127为模板剂,采用微波辅助软模板法制备了不同Ag负载量的介孔Ag/CeO_(2)复合材料。对材料进行XRD、N_(2)吸附-脱附、XPS、SEM以及EDS表征分析。结果表明,Ag/CeO_(2)复合材料属于介孔结构,具有较大的比表面积,存在Ce^(3+)、Ce^(4+),Ag离子均匀负载于CeO_(2)表面。考察了影响苯酚催化降解的多个因素。在65℃初始pH值为6时、投加Ag/CeO_(2)(a)催化剂2 g/L、H_(2)O_(2)1 mL对100 mg/L苯酚COD去除率可达79.19%,5次使用后催化效果仍可达50%以上。

The mesoporous Ag/CeO_(2) composites with different Ag loadings are prepared using cerium nitrate and silver nitrate as raw materials and the block polymer F127 as templating agent,and the materials are characterized by XRD,N_(2) adsorption-desorption,XPS,SEM and EDS.The results show that the Ag/CeO_(2) composites are mesoporous structures with a large specific surface area with the presence of Ce^(3+),Ce^(4+) and uniform loading of Ag ions on the CeO_(2) surface.A number of factors affecting the catalytic degradation of phenol are examined.At an initial pH of 6 at 65℃,the removal of 100 mg/L phenol COD is 79.19%with the addition of 2 g/L Ag/CeO_(2)(a)catalyst and 1 mL H_(2)O_(2),and the catalytic effect is still above 50%after five applications.