Synthesis of homogeneous styrenic pyridine resin (LSL-030-bd) and its application to the separation of uranium and molybdenum

IF 1.5 3区化学 Q3 CHEMISTRY, ANALYTICAL

Journal of Radioanalytical and Nuclear Chemistry Pub Date : 2024-08-29 DOI:10.1007/s10967-024-09698-x

Yukai Peng, Jiahui Li, Jingfang Xue, Hao Jin, Yu Zeng, Wei Zhao, Xuebin Su, Rong Hua

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Abstract

This paper synthesized a stytypyridine (LSL-030-bd) resin with small particle size and uniform distribution to recover molybdenum resources leached during neutral in-situ leaching of uranium. The batch experiment results show that the LSL-030-bd ion exchange resin produced had the highest U(VI) adsorption capacity at pH 7.0, reaching 187.20 mg·g⁻¹. At pH 3.0, LSL-030-bd resin adsorbed 180.17 mg·g⁻¹ of Mo(VI). At pH 7.0, the resin exhibited the highest separation coefficient for uranium and molybdenum, with a KD value of 9.08. The resin's adsorption of U(VI) is a spontaneous endothermic process involving monolayer adsorption that combines physical and chemical adsorption. The adsorption of Mo(VI) by the resin is an exothermic process that is not spontaneous. It involves monomolecular layer adsorption with hydrogen bonding as the primary chemical force. By desorbing molybdenum with NH₄SCN, followed by utilizing a mixed solution of NH₄HCO₃ and (NH₄)₂CO₃ to desorb uranium, a step-by-step desorption process may be achieved to separate and purify uranium and molybdenum.

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均相苯乙烯吡啶树脂（LSL-030-bd）的合成及其在铀和钼分离中的应用

本文合成了一种粒径小、分布均匀的苯乙烯吡啶（LSL-030-bd）树脂，用于回收铀中性原地浸出过程中浸出的钼资源。批量实验结果表明，所生产的 LSL-030-bd 离子交换树脂在 pH 值为 7.0 时对铀(VI)的吸附容量最高，达到 187.20 mg-g-1。在 pH 值为 3.0 时，LSL-030-bd 树脂对 Mo(VI) 的吸附量为 180.17 mg-g-1。在 pH 值为 7.0 时，该树脂对铀和钼的分离系数最高，KD 值为 9.08。该树脂对铀（VI）的吸附是一个自发的内热过程，涉及单层吸附，是物理吸附和化学吸附的结合。树脂对 Mo(VI) 的吸附是一个非自发的放热过程。它涉及以氢键为主要化学力的单分子层吸附。先用 NH4SCN 对钼进行解吸，再用 NH4HCO3 和 (NH4)2CO3 混合溶液对铀进行解吸，可以实现逐步解吸的过程，从而分离和提纯铀和钼。

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来源期刊

Journal of Radioanalytical and Nuclear Chemistry 化学-分析化学

CiteScore

2.80

自引率

18.80%

发文量

504

审稿时长

2.2 months

期刊介绍： An international periodical publishing original papers, letters, review papers and short communications on nuclear chemistry. The subjects covered include: Nuclear chemistry, Radiochemistry, Radiation chemistry, Radiobiological chemistry, Environmental radiochemistry, Production and control of radioisotopes and labelled compounds, Nuclear power plant chemistry, Nuclear fuel chemistry, Radioanalytical chemistry, Radiation detection and measurement, Nuclear instrumentation and automation, etc.