Stephanie Szenknect, Adel Mesbah
In this study, synthetic copper substituted hydroxyapatite (Cu-Hap), Cu xCa10-x(PO4)6(OH)2 were prepared by co-precipitation method and were used as reactive materials in batch experiments to immobilize uranyl. The limit of incorporation of Cu into a single-phased Cu-Hap reached x Cu ≤1.59. The synthetic Cu-Hap samples obtained with various Cu contents were contacted with synthetic uranyl doped solutions and with real mining waters showing various pH and chemical compositions. A fast and strong decrease of the uranium concentration was observed, followed by the establishment of an equilibrium after 1 –4 days of contact with the solutions. Examination of the solid phase after uranium uptake was performed using a combination of techniques. Depending on the composition of the solution and the copper content of the Cu-Hap, various mechanisms of uranium removal were observed. Based on the experimental results and geochemical simulations, it appeared that the main interest for using Cu-Hap is to enlarge the domain of water compositions for which the precipitation of meta-torbernite, (H3O)0.4Cu0.8(UO2)2(PO4)2·7.6 H2O is the predominant mechanism associated to the uranium removal, especially for pH > 6.7 where carbonate uranium species are predominant.
@article{66afd136-233e-4d69-83b6-2e37318bc27c,
title={Uranium removal from mining water using Cu substituted hydroxyapatite},
author={Stephanie Szenknect and Adel Mesbah},
year={2020},
language={en}
}TY - JOUR TI - Uranium removal from mining water using Cu substituted hydroxyapatite AU - Stephanie Szenknect AU - Adel Mesbah PY - 2020 LA - en ER -
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