文献类型：期刊文献

英文题名：The role of exposed facets in the Fenton-like reactivity of CeO2 nanocrystal to the Orange II

作者：Zang, Chengjie;Zhang, Xiansong;Hu, Shiyu;Chen, Feng[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2017

卷号：216

起止页码：106

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;EI(收录号：20172203720629);WOS:【SCI-EXPANDED(收录号:WOS:000402816700011)】；

基金：This work was supported by the National Nature Science Foundations of China (21177039, 21677049).

语种：英文

外文关键词：Fenton-like reaction; Kinetics; Crystal facet; CeO2 nanorod; CeO2 nanocube

摘要：Recently, ceria-based Fenton-like reactions have been developing in wastewater treatment. Nevertheless, the effects of geometric (exposed facets) of the CeO2 on its Fenton-like reactivity have rarely been considered. In this work, shaped CeO2 nanocrystals with different exposed facets were synthesized and applied in the Fenton-like degradation of Orange II (AO7). Due to the relative low oxygen vacancy formation energy on {110} facet, H2O2 decomposition shows higher apparent activation energy with nanocubes ({100} facet) than that with nanorods ( {110} and {100} facets). CeO2 nanorods calcined at 300 degrees C exhibits the maximal activity for the decomposition of H2O2, while that for the Fenton-like degradation of AO7 is achieved with CeO2 nanorods calcined at 500 degrees C. Calcination at higher temperature decreases the surface Ce(III) content of CeO2, thus lowers the H2O2 decomposition rate. On the contrary, the decrescent formation energy of oxygen vacancy, the decreased amount of surface hydroxyls, as well as reduced coordination status of surface Ce cations, play important roles in promoting the adsorption and Fenton-like degradation of AO7 for CeO2 nanorods calcined at 500 degrees C. (C) 2017 Elsevier B.V. All rights reserved.