镨掺杂二氧化铈的溶剂热合成、结构表征及光学性质及其对酸性橙7的降解

Solvothermal Synthesis, Structural Characterization and Optical Properties of Pr-Doped CeO and Their Degradation for Acid Orange 7.

作者信息

Xu Yaohui, Wu Pingkeng, Wu Mingjin, Gu Yuehe, Yu Hongguang, Ding Zhao

机构信息

Laboratory for Functional Materials, School of New Energy Materials and Chemistry, Leshan Normal University, Leshan 614004, China.

Department of Chemical Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA.

出版信息

Materials (Basel). 2022 Oct 7;15(19):6953. doi: 10.3390/ma15196953.

DOI:10.3390/ma15196953

PMID:36234294

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9572288/

Abstract

Pr-doped CeO with different doping levels was prepared from Ce(NO)∙6HO and Pr(NO)∙6HO by solvothermal method without any additional reagents, in which the mixed solution of ethylene glycol and distilled water was employed as a solvent. The influences of Pr-doping on phase composition, crystal structure and morphology were investigated, as well as Pr valence and oxygen vacancy defects. The Pr cations entered into the CeO crystal lattice with normal trivalence and formed a Pr-CeO solid solution based on the fluorite structure. The larger trivalent Pr was substituted for tetravalent Ce in the CeO crystal and compensated by oxygen vacancy defects, which caused the local lattice expansion of the crystal lattice. Moreover, the Pr-doped CeO solid solutions exhibited visible color variation from bright cream via brick red to dark brown with the increasing of Pr contents. The degradation of AO7 dye was also investigated using a domestic medical ultraviolet lamp; the removal efficiency of AO7 by 1% and 2% Pr-doped CeO approached 100%, much higher than 66.2% for undoped CeO.

摘要

采用溶剂热法，以Ce(NO₃)₃∙6H₂O和Pr(NO₃)₃∙6H₂O为原料，无需添加任何其他试剂，制备了不同掺杂水平的Pr掺杂CeO₂，其中以乙二醇和蒸馏水的混合溶液作为溶剂。研究了Pr掺杂对相组成、晶体结构和形貌的影响，以及Pr的价态和氧空位缺陷。Pr阳离子以正常的三价态进入CeO₂晶格，形成了基于萤石结构的Pr-CeO₂固溶体。较大的三价Pr取代了CeO₂晶体中的四价Ce，并由氧空位缺陷补偿，这导致了晶格的局部晶格膨胀。此外，随着Pr含量的增加，Pr掺杂的CeO₂固溶体呈现出从亮米色经砖红色到深棕色的可见颜色变化。还使用家用医用紫外线灯研究了AO7染料的降解情况；1%和2% Pr掺杂的CeO₂对AO7的去除效率接近100%，远高于未掺杂CeO₂的66.2%。