{"title":"Precipitation of meta-autunite from Ca(II)-U(VI)-PO43− system with inorganic pH regulator for uranium immobilization","authors":"Jiamei Rao, Pingchao Ke, Kunkun Wang, Tiannan Wu, Tingting Zhong, Jiale Li, Huichun Gong, Lingling Xu, Yipeng Zhou, Zhanxue Sun","doi":"10.1007/s10967-025-10349-y","DOIUrl":null,"url":null,"abstract":"<div><p>This study explored U immobilization via meta-autunite precipitation in a Ca(II)-U(VI)-PO<sub>4</sub><sup>3−</sup> system using NaOH/HNO<sub>3</sub> 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.</p></div>","PeriodicalId":661,"journal":{"name":"Journal of Radioanalytical and Nuclear Chemistry","volume":"334 9","pages":"6001 - 6014"},"PeriodicalIF":1.6000,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Radioanalytical and Nuclear Chemistry","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s10967-025-10349-y","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
引用次数: 0
Abstract
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.
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.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
