Controlled synthesis of Ce(OH)CO_3 flowers by a hydrothermal method and their thermal conversion to CeO_2 flowers

作     者：Dongen Zhang Feng Li Jian Gu Qing Xie Shanzhong Li Xiaobo Zhang Guiquan Han Ailing Ying Zhiwei Tong 

作者机构：Department of Chemical EngineeringHuaihai Institute of Technology SORSTJapan Science and Technology Agency(JST)Japan College of ChemistryChina University of Mining and Technology 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2012年第10卷第6期

页      面：771-776页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：supported by a Grant-in-aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) the CREST program of the Japan Science and Technology Agency(JST) the National Natural Science Foundation of China(No. 50873042,21001048) ,the Natural Science Foundation of Jiangsu Province(No.BK2009650) the High School Science Research Key Project of Jiangsu Province(11KJA430008) the High School Science Research Project of Jiangsu Province(No.11KJB150002) "Qing Lan Project" of the universities and colleges in Jiangsu Province 

主　　题：Crystal growth Flowers Self assembly 

摘      要：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℃ 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 ℃ 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 （Eg） is 2.66 eV, which is lower than that of bulk ceria.