Citation: Rugeng Liu, Yangyang Meng, Wenjing Ji, Wei Han, Mei Li, Yang Sun. Fluorination reaction of UO₃ and electrochemical preparation of UO₂[J]. Chinese Chemical Letters, ;2022, 33(7): 3435-3438. doi: 10.1016/j.cclet.2022.02.069 shu

Fluorination reaction of UO₃ and electrochemical preparation of UO₂

Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China

weihan@hrbeu.edu.cn

meili@hrbeu.edu.cn

Received Date: 27 December 2021
Revised Date: 25 February 2022
Accepted Date: 25 February 2022
Available Online: 1 March 2022

Figures(3)

In this work, a technique was proposed to prepare UO₂ from UO₃ by the two processes of fluorination reaction of UO₃ with NH₄HF₂ and electrochemical reduction of UO₂²⁺ for the recycle uranium. The feasibility of fluorination reaction was firstly confirmed using thermodynamic calculation; then, the products were analyzed using XRD, Raman and fluorescence to be UO₂F₂. The fluorination mechanism was inferred to be UO₃(s) + NH₄HF₂ → (NH₄)₃UO₂F₅→ NH₄(UO₂)₂F₅ → UO₂F₂. The redox behavior of UO₂²⁺ on W electrode was investigated by cyclic voltammetry and square wave voltammetry, which indicated that UO₂²⁺ was reduced to UO₂ via a two-step single electron transfer with diffusion-controlled. The diffusion coefficient of UO₂²⁺ was calculated to be 6.22 × 10⁻⁵ cm²/s. The disproportionation reaction of UO₂²⁺ was observed, and the relationship between the disproportionation reaction and scan rate was discussed. Moreover, the electrochemical fabrication of UO₂ was conducted by electrolysis at −0.8 V, and the product was analyzed by XRD, SEM and EDS to be UO₂. ICP-AES results showed that the extraction efficiency of UO₂ could reach 98.53%.
- UO₃,
- Fluorination reaction,
- NH₄HF₂,
- Electrochemical formation,
- UO₂
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Fluorination reaction of UO₃ and electrochemical preparation of UO₂