Controlled synthesis of Ce(OH)CO3 flowers by a hydrothermal method and their thermal conversion to CeO2 flowers--颗粒学报PARTICUOLOGY

Zhang, D., Li, F., Gu, J., Xie, Q., Li, S., Zhang, X., Han, G., Ying, A., & Tong, Z. (2012). Controlled synthesis of Ce(OH)CO3 flowers by a hydrothermal method and their thermal conversion to CeO2 flowers. Particuology, 10(6), 771–776. https://doi.org/10.1016/j.partic.2012.01.004

Controlled synthesis of Ce(OH)CO₃ flowers by a hydrothermal method and their thermal conversion to CeO₂ flowers

Dongen Zhang ^{a c}, Feng Li ^b, Jian Gu ^a, Qing Xie ^a, Shanzhong Li ^a, Xiaobo Zhang ^a, Guiquan Han ^a, Ailing Ying ^a, Zhiwei Tong ^{a c *}

a Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, China
b College of Chemistry, China University of Mining and Technology, Xuzhou 221116, China
c SORST, Japan Science and Technology Agency (JST), Japan

10.1016/j.partic.2012.01.004

Volume 10, Issue 6, December 2012, Pages 771-776

Received 11 August 2011, Revised 9 January 2012, Accepted 30 January 2012, Available online 13 April 2012.

E-mail: zdewxm@yahoo.com.cn

Highlights

► Ce(OH)CO₃ flowers were prepared in a water–N₂H₄ complex.

► Influences of the N₂H₄ content and temperature on flower formation were discussed.

► CeO₂ flowers were prepared by thermal conversion of Ce(OH)CO₃ flowers at 500 °C.

► The Eg of CeO₂ flowers is 2.66 eV, and lower than that of bulk ceria.

Abstract

Highly uniform Ce(OH)CO₃ flowers were successfully prepared in large quantities using a facile hydrothermal approach from the reaction of Ce(NH₄)(NO₃)₄ with CO(NH₂)₂ at 160 °C in a water–N₂H₄ complex. The influences of the N₂H₄ content and temperature on flower formation were discussed. CeO₂ flowers were prepared by thermal conversion of Ce(OH)CO₃ flowers at 500 °C in air. Both Ce(OH)CO₃ and CeO₂ flowers were characterized by X-ray powder diffraction (XRD), and scanning electron microscopy (SEM). The UV–vis adsorption spectrum of the CeO₂ flowers showed that the band gap energy (E_g) is 2.66 eV, which is lower than that of bulk ceria.

Graphical abstract

Keywords

Crystal growth; Flowers; Self-assembly

文章导读