用无机pH调节剂从Ca(II)-U(VI)-PO43−体系中沉淀中超钙钛矿用于铀固定化

IF 1.6 3区化学 Q3 CHEMISTRY, ANALYTICAL

Journal of Radioanalytical and Nuclear Chemistry Pub Date : 2025-08-25 DOI:10.1007/s10967-025-10349-y

Jiamei Rao, Pingchao Ke, Kunkun Wang, Tiannan Wu, Tingting Zhong, Jiale Li, Huichun Gong, Lingling Xu, Yipeng Zhou, Zhanxue Sun

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引用次数: 0

摘要

本研究探讨了在Ca(II)-U(VI)-PO43−体系中，以NaOH/HNO3作为无机pH调节剂，通过超氧化钨沉淀法固定化U的方法。结果表明，在反应4 h， 60-100 mg/L U, 25°C, pH 6.0, Ca:U:P = 50:1:10的最佳条件下，无机调节剂的U固定化效率与有机调节剂相当（98%）。XRD， SEM和FT-IR分析显示，无机和有机调节剂的产品组成/结构没有显著差异。而无机调控产物具有较高的结晶度和层状堆积晶粒。尽管使用了NaOH，但由于meta-autunite的稳定性优于Na-autunite，因此产品中没有Na，有利于其优先沉淀并抑制Na-autunite的形成。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Precipitation of meta-autunite from Ca(II)-U(VI)-PO43− system with inorganic pH regulator for uranium immobilization

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Precipitation of meta-autunite from Ca(II)-U(VI)-PO43− system with inorganic pH regulator for uranium immobilization

This study explored U immobilization via meta-autunite precipitation in a Ca(II)-U(VI)-PO₄³⁻ system using NaOH/HNO₃ as inorganic pH regulators. Results demonstrated inorganic regulators achieved comparable U immobilization efficiency (98%) to organic ones under optimal conditions: 4 h reaction, 60–100 mg/L U, 25 °C, pH 6.0, and Ca:U:P = 50:1:10. XRD, SEM, and FT-IR analyses revealed no significant differences in product composition/structure between inorganic and organic regulators. However, inorganic-regulated products exhibited higher crystallinity and lamellar stacked grains. Despite NaOH usage, Na was absent in products due to meta-autunite’s superior stability over Na-autunite, favoring its preferential precipitation and inhibiting Na-autunite formation.

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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.