纳米复合材料的制备及催化性能
(1. 常州大学 材料科学与工程学院，常州 213164；2. 苏州科技学院 化学与生物工程学院，苏州 215011)
摘 要: 采用共沉淀法制备Ce1−xMnxO2−δ−凹凸棒石(Ce1−xMnxO2−δ−ATP)纳米复合材料，考察不同Mn掺杂量和负载量对纳米复合材料结构和性能的影响；采用X射线衍射仪 (XRD)、透射电子显微镜 (TEM)和Raman光谱仪等对复合材料的微观结构等进行表征。结果表明：当负载量为50%(质量分数)时，Ce1−xMnxO2−δ颗粒在ATP表面分散情况较好，晶粒为7~11 nm；当x≤0.2时，Mn的掺杂未使CeO2的萤石结构发生变化，活性组分以固溶态存在于载体表面，Ce0.8Mn0.2O2−δ−ATP复合材料对苯酚的催化降解效果较好，其化学需氧量(COD)去除率可达97%，优于单一ATP和CeO2材料的催化降解效果；当x＞0.2时，复合材料中出现Mn2O3相，其催化性能降低。
关键字: 纳米复合材料；氧化铈；氧化锰；固溶体
Ce1−xMnxO2−δ−attapulgite nanocomposite materials
（1. Faculty of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;
2. Department of Chemistry and Bioengineering, Suzhou University of Science and Technology, Suzhou 215011, China）
Abstract:Ce1−xMnxO2−δ−attapulgite (Ce1−xMnxO2−δ−ATP) nanocomposite materials were prepared by coprecipitation method. The effects of Mn doping concentration and loading amount of composite oxide on the structures and properties of Ce1−xMnxO2−δ−ATP were investigated. X-ray diffractometer (XRD), transmission electron microscope (TEM) and laser Raman spectra (LRS) were employed to characterize the microstructures of the composite materials. The results show that when the loading amount is 50% (mass fraction), Ce1−xMnxO2−δ particles with a uniform size of 7−11 nm disperse on the surface of ATP. When x is less than 0.2, Mn doping does not change the fluorite structure of CeO2, and Ce1−xMnxO2−δ solid solutions are supported on the surface of ATP. The catalytic efficiency of Ce0.8Mn0.2O2−δ−ATP in oxidizing phenol is better than that of pure CeO2 or ATP. The chemical oxygen demand (COD) removal rate of Ce0.8Mn0.2O2−δ−ATP can reach 97%. When x is larger than 0.2, Mn2O3 phase emerges in composite materials and the catalytic efficiency decreases.
Key words: nanocomposite material; ceria; manganese oxide; solid solution
