納米復(fù)合材料的制備及催化性能
(1. 常州大學(xué) 材料科學(xué)與工程學(xué)院，常州 213164；2. 蘇州科技學(xué)院 化學(xué)與生物工程學(xué)院，蘇州 215011)
摘 要: 采用共沉淀法制備Ce1−xMnxO2−δ−凹凸棒石(Ce1−xMnxO2−δ−ATP)納米復(fù)合材料，考察不同Mn摻雜量和負(fù)載量對(duì)納米復(fù)合材料結(jié)構(gòu)和性能的影響；采用X射線衍射儀 (XRD)、透射電子顯微鏡 (TEM)和Raman光譜儀等對(duì)復(fù)合材料的微觀結(jié)構(gòu)等進(jìn)行表征。結(jié)果表明：當(dāng)負(fù)載量為50%(質(zhì)量分?jǐn)?shù))時(shí)，Ce1−xMnxO2−δ顆粒在ATP表面分散情況較好，晶粒為7~11 nm；當(dāng)x≤0.2時(shí)，Mn的摻雜未使CeO2的螢石結(jié)構(gòu)發(fā)生變化，活性組分以固溶態(tài)存在于載體表面，Ce0.8Mn0.2O2−δ−ATP復(fù)合材料對(duì)苯酚的催化降解效果較好，其化學(xué)需氧量(COD)去除率可達(dá)97%，優(yōu)于單一ATP和CeO2材料的催化降解效果；當(dāng)x＞0.2時(shí)，復(fù)合材料中出現(xiàn)Mn2O3相，其催化性能降低。
關(guān)鍵字: 納米復(fù)合材料；氧化鈰；氧化錳；固溶體
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
