Fluorination reaction of UO_(3)and electrochemical preparation of UO_(2)

作     者：Rugeng Liu Yangyang Meng Wenjing Ji Wei Han Mei Li Yang Sun Rugeng Liu;Yangyang Meng;Wenjing Ji;Wei Han;Mei Li;Yang Sun

作者机构：Key Laboratory of Superlight Materials and Surface TechnologyMinistry of EducationCollege of Material Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2022年第33卷第7期

页      面：3435-3438页

核心收录：

学科分类：081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 082702[工学-核燃料循环与材料] 0805[工学-材料科学与工程（可授工学、理学学位）] 0827[工学-核科学与技术] 

基　　金：financially supported by the National Natural Science foundation of China(Nos.U2167215,22076035,21876034,11875116 and 21790373) the Fundamental Research Funds for the Central Universities(No.3072021CFJ1001) 

主　　题：UO_(3) Fluorination reaction NH_(4)HF_(2) Electrochemical formation UO_(2) 

摘      要：In this work,a technique was proposed to prepare UO_(2)from UO_(3)by the two processes of fluorination reaction of UO_(3)with NH_(4)HF_(2)and electrochemical reduction of UO_(2)^(2+)for the recycle *** feasibility of fluorination reaction was firstly confirmed using thermodynamic calculation;then,the products were analyzed using XRD,Raman and fluorescence to be UO_(2)F_(2).The fluorination mechanism was inferred to be UO_(3)(s)+NH_(4)HF_(2)→(NH_(4))_(3)UO_(2)F_(5)→NH_(4)(UO_(2))_(2)F_(5)→UO_(2)F_(2).The redox behavior of UO_(2)^(2+)on W electrode was investigated by cyclic voltammetry and square wave voltammetry,which indicated that UO_(2)^(2+) was reduced to UO_(2)via a two-step single electron transfer with *** diffusion coefficient of UO_(2)^(2+) was calculated to be 6.22×10^(-5)cm/*** disproportionation reaction of UO_(2)^(+) was observed,and the relationship between the disproportionation reaction and scan rate was ***,the electrochemical fabrication of UO_(2) was conducted by electrolysis at-0.8 V,and the product was analyzed by XRD,SEM and EDS to be UO_(2).ICP-AES results showed that the extraction efficiency of UO_(2) could reach 98.53%.