Fast and Efficient Removal of Uranium onto a Magnetic Hydroxyapatite Composite: Mechanism and Process Evaluation
The exploration and rational design of easily separable and highly efficient sorbents with satisfactory capability of extracting radioactive uranium (U)-containing compound(s) are of paramount significance. In this study, a novel magnetic hydroxyapatite (HAP) composite (HAP@ CoFe<sub>2</sub...
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| Autores principales: | , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/c4d95a81f800450cae6924a88867ebeb |
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| Sumario: | The exploration and rational design of easily separable and highly efficient sorbents with satisfactory capability of extracting radioactive uranium (U)-containing compound(s) are of paramount significance. In this study, a novel magnetic hydroxyapatite (HAP) composite (HAP@ CoFe<sub>2</sub>O<sub>4</sub>), which was coupled with cobalt ferrite (CoFe<sub>2</sub>O<sub>4</sub>), was rationally designed for uranium(VI) removal through a facile hydrothermal process. The U(VI) ions were rapidly removed using HAP@ CoFe<sub>2</sub>O<sub>4</sub> within a short time (i.e., 10 min), and a maximum U(VI) removal efficiency of 93.7% was achieved. The maximum adsorption capacity (Q<sub>max</sub>) of the HAP@CoFe<sub>2</sub>O<sub>4</sub> was 338 mg/g, which demonstrated the potential of as-prepared HAP@CoFe<sub>2</sub>O<sub>4</sub> in the purification of U(VI) ions from nuclear effluents. Autunite [Ca(UO<sub>2</sub>)<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>6</sub>] was the main crystalline phase to retain uranium, wherein U(VI) was effectively extracted and immobilized in terms of a relatively stable mineral. Furthermore, the reacted HAP@CoFe<sub>2</sub>O<sub>4</sub> can be magnetically recycled. The results of this study reveal that the suggested process using HAP@CoFe<sub>2</sub>O<sub>4</sub> is a promising approach for the removal and immobilization of U(VI) released from nuclear effluents. |
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