超临界水氧化法制备不同形貌的纳米CeO2及其表征  

Preparation by Supercritical Water Oxidation and Characterization of Nano-CeO with Different Morphologies

作　　者：包中华 李梅[1] 李科 王硕[1] 高凯[1] 张栋梁[1] BAO Zhong-hua;LI Mei;LI Ke;WANG Shuo;GAO Kai;ZHANG Dong-liang(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《稀有金属与硬质合金》2020年第4期33-36,共4页Rare Metals and Cemented Carbides

摘　　要：以硝酸铈为原料,采用超临界水氧化法,在不同的硝酸铈浓度、pH、填装度和反应时间条件下制备纳米CeO2粉末,应用XRD、FE-SEM对所制备样品的晶体结构和形貌进行表征,并分析了样品的粒度、比表面积及其溶胶的Zeta电位。结果表明,随着Ce(NO3)3·6H2O水溶液浓度降低,所制备纳米CeO2粉末粒径减小,形貌近似于球形,但粒子间有团聚现象;随着溶液pH降低,颗粒形貌从近球形变为纤维棒状后又变为立方结构;纤维棒状纳米CeO2颗粒有较大的比表面积83.4 m^2/g。当浓度为0.1 mol/L、溶液pH为2时,CeO2溶胶的Zeta电位最高,稳定性良好,不易团聚。Using cerium nitrate as raw material,nano-CeO2 powder was prepared with supercritical water oxidation method under different conditions of cerium nitrate concentration,pH,filling degree and reaction time.The crystal structure and morphology of the prepared samples were characterized by XRD and FE-SEM,and their particle size,specific surface area and Zeta potential in sol were also analyzed.The results show that as the concentration of Ce(NO3)3·6 H2O aqueous solution decreases,the particle size of the prepared nano-CeO2 powder decreases,and its morphology is approximately spherical with agglomeration.As solution pH decreases,the particle morphology changes from approximately spherical to fibrous rod-shaped and then to a cubic structure.The fibrous rod-shaped nano-CeO2 particles have a larger specific surface area of 83.4 m^2/g.When the concentration is 0.1 mol/L and the solution pH is 2,CeO2 sol has the highest Zeta potential and good stability to prevent aggregation.

关 键 词：纳米CEO2 超临界水 氧化 Ce(NO3)3·6H2O 形貌 粒径 ZETA电位 

分 类 号：O614.332[理学—无机化学]