Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO<sub>2</sub> Composite
The strong demand for rare-earth elements (REEs) is driven by their wide use in high-tech devices. New processes have to be developed for valorizing low-grade ores or alternative metal sources (such as wastes and spent materials). The present work contributed to the development of new sorbents for t...
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MDPI AG
2021-02-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/26/4/1049 |
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| author | Khalid A. M. Salih Mohammed F. Hamza Hamed Mira Yuezhou Wei Feng Gao Ayman M. Atta Toyohisa Fujita Eric Guibal |
| author_facet | Khalid A. M. Salih Mohammed F. Hamza Hamed Mira Yuezhou Wei Feng Gao Ayman M. Atta Toyohisa Fujita Eric Guibal |
| author_sort | Khalid A. M. Salih |
| collection | DOAJ |
| description | The strong demand for rare-earth elements (REEs) is driven by their wide use in high-tech devices. New processes have to be developed for valorizing low-grade ores or alternative metal sources (such as wastes and spent materials). The present work contributed to the development of new sorbents for the recovery of rare earth ions from aqueous solutions. Functionalized mesoporous silica composite was synthesized by grafting diethylenetriamine onto composite support. The physical and chemical properties of the new sorbent are characterized using BET, TGA, elemental analysis, titration, FTIR, and XPS spectroscopies to identify the reactive groups (amine groups: 3.25 mmol N g<sup>−1</sup> and 3.41 by EA and titration, respectively) and their mode of interaction with Nd(III) and Gd(III). The sorption capacity at the optimum pH (i.e., 4) reaches 0.9 mmol Nd g<sup>−1</sup> and 1 mmol Gd g<sup>−1</sup>. Uptake kinetics are modeled by the pseudo-first-order rate equation (equilibrium time: 30–40 min). At pH close to 4–5, the sorbent shows high selectivity for rare-earth elements against alkali-earth elements. This selectivity is confirmed by the efficient recovery of REEs from acidic leachates of gibbsite ore. After elution (using 0.5 M HCl solutions), selective precipitation (using oxalate solutions), and calcination, pure rare earth oxides were obtained. The sorbent shows promising perspective due to its high and fast sorption properties for REEs, good recycling, and high selectivity. |
| first_indexed | 2024-03-09T00:47:56Z |
| format | Article |
| id | doaj.art-b5a0843c9463499e98db7340809afe14 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T00:47:56Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-b5a0843c9463499e98db7340809afe142023-12-11T17:24:17ZengMDPI AGMolecules1420-30492021-02-01264104910.3390/molecules26041049Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO<sub>2</sub> CompositeKhalid A. M. Salih0Mohammed F. Hamza1Hamed Mira2Yuezhou Wei3Feng Gao4Ayman M. Atta5Toyohisa Fujita6Eric Guibal7Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaGuangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaNuclear Materials Authority, P.O. Box 530, El-Maadi, Cairo 11381, EgyptGuangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaGuangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaChemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi ArabiaGuangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaPolymers Composites and Hybrids (PCH), IMT Mines Ales, CEDEX, F-30319 Alès, FranceThe strong demand for rare-earth elements (REEs) is driven by their wide use in high-tech devices. New processes have to be developed for valorizing low-grade ores or alternative metal sources (such as wastes and spent materials). The present work contributed to the development of new sorbents for the recovery of rare earth ions from aqueous solutions. Functionalized mesoporous silica composite was synthesized by grafting diethylenetriamine onto composite support. The physical and chemical properties of the new sorbent are characterized using BET, TGA, elemental analysis, titration, FTIR, and XPS spectroscopies to identify the reactive groups (amine groups: 3.25 mmol N g<sup>−1</sup> and 3.41 by EA and titration, respectively) and their mode of interaction with Nd(III) and Gd(III). The sorption capacity at the optimum pH (i.e., 4) reaches 0.9 mmol Nd g<sup>−1</sup> and 1 mmol Gd g<sup>−1</sup>. Uptake kinetics are modeled by the pseudo-first-order rate equation (equilibrium time: 30–40 min). At pH close to 4–5, the sorbent shows high selectivity for rare-earth elements against alkali-earth elements. This selectivity is confirmed by the efficient recovery of REEs from acidic leachates of gibbsite ore. After elution (using 0.5 M HCl solutions), selective precipitation (using oxalate solutions), and calcination, pure rare earth oxides were obtained. The sorbent shows promising perspective due to its high and fast sorption properties for REEs, good recycling, and high selectivity.https://www.mdpi.com/1420-3049/26/4/1049functionalized mesoporous silicarare-earth elementssorption isothermsuptake kineticssorbent recyclingore leachate |
| spellingShingle | Khalid A. M. Salih Mohammed F. Hamza Hamed Mira Yuezhou Wei Feng Gao Ayman M. Atta Toyohisa Fujita Eric Guibal Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO<sub>2</sub> Composite Molecules functionalized mesoporous silica rare-earth elements sorption isotherms uptake kinetics sorbent recycling ore leachate |
| title | Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO<sub>2</sub> Composite |
| title_full | Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO<sub>2</sub> Composite |
| title_fullStr | Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO<sub>2</sub> Composite |
| title_full_unstemmed | Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO<sub>2</sub> Composite |
| title_short | Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO<sub>2</sub> Composite |
| title_sort | nd iii and gd iii sorption on mesoporous amine functionalized polymer sio sub 2 sub composite |
| topic | functionalized mesoporous silica rare-earth elements sorption isotherms uptake kinetics sorbent recycling ore leachate |
| url | https://www.mdpi.com/1420-3049/26/4/1049 |
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