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Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO(2) 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...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7922550/ https://www.ncbi.nlm.nih.gov/pubmed/33671351 http://dx.doi.org/10.3390/molecules26041049 |
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author | Salih, Khalid A. M. Hamza, Mohammed F. Mira, Hamed Wei, Yuezhou Gao, Feng Atta, Ayman M. Fujita, Toyohisa Guibal, Eric |
author_facet | Salih, Khalid A. M. Hamza, Mohammed F. Mira, Hamed Wei, Yuezhou Gao, Feng Atta, Ayman M. Fujita, Toyohisa Guibal, Eric |
author_sort | Salih, Khalid A. M. |
collection | PubMed |
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(−1) 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(−1) and 1 mmol Gd g(−1). 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. |
format | Online Article Text |
id | pubmed-7922550 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-79225502021-03-03 Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO(2) Composite Salih, Khalid A. M. Hamza, Mohammed F. Mira, Hamed Wei, Yuezhou Gao, Feng Atta, Ayman M. Fujita, Toyohisa Guibal, Eric Molecules Article 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(−1) 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(−1) and 1 mmol Gd g(−1). 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. MDPI 2021-02-17 /pmc/articles/PMC7922550/ /pubmed/33671351 http://dx.doi.org/10.3390/molecules26041049 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Salih, Khalid A. M. Hamza, Mohammed F. Mira, Hamed Wei, Yuezhou Gao, Feng Atta, Ayman M. Fujita, Toyohisa Guibal, Eric Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO(2) Composite |
title | Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO(2) Composite |
title_full | Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO(2) Composite |
title_fullStr | Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO(2) Composite |
title_full_unstemmed | Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO(2) Composite |
title_short | Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO(2) Composite |
title_sort | nd(iii) and gd(iii) sorption on mesoporous amine-functionalized polymer/sio(2) composite |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7922550/ https://www.ncbi.nlm.nih.gov/pubmed/33671351 http://dx.doi.org/10.3390/molecules26041049 |
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