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

2刘三喜,惠宇,朱玲,范习之,邹兵林,曹学强.Synthesis and luminescence properties of CeF_3:Tb^(3+) nanodisks via ultrasound assisted ionic liquid method[J].稀土学报：英文版,2014,32(6):508-513. 被引量：7

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Chinese Library Classification Number:O614.332[理学—无机化学]

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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.