Behavior of uranium immobilization with hydroxyapatite and dissolution stability of the immobilization product

• Published in: Journal of radioanalytical and nuclear chemistry Vol. 332; no. 3; pp. 647 - 657
• Main Authors: Wu, Tiannan, Wang, Mingbing, Zhong, Tingting, Liu, Yajie, Sun, Zhanxue, Zhou, Yipeng, Ke, Pingchao
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.03.2023; Springer; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Diagnostic Radiology; Dissolution; Hadrons; Heavy Ions; Hydroxyapatite; Immobilization; Inorganic Chemistry; Leaching; Nuclear Chemistry; Nuclear Physics; Physical Chemistry; Stability; Thermodynamic models; Toxicity; Uranium; Uranium immobilization; Hydroxyapatite; Dissolution stability; Thermodynamic model
• ISSN: 0236-5731; 1588-2780
• DOI: 10.1007/s10967-023-08799-3

Uranium was immobilized with hydroxyapatite and the dissolution stability of the immobilization product was investigated. The immobilization efficiency and capacity of U were respectively almost 100% and 105 mg/g at the optimal conditions that were experimentally determined. Meta-autunite was found in the mineral phases of the immobilization product, and its dissolved concentration of U was below 0.1 mg/L pH of 5–7 and only 34 μg/L from the toxicity characteristic leaching procedure (TCLP) test. A thermodynamic model of dissolution was established to reveal the mechanism of high dissolution stability of the immobilization product.