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Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents
Efficient capture of barium (Ba) from solution is a serious task in environmental protection and remediation. Herein, the capacity and the mechanism of Ba adsorption by natural and iron(III) oxide (FeO) modified allophane (ALO), beidellite (BEI) and zeolite (ZEO) were investigated by considering the...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7321624/ https://www.ncbi.nlm.nih.gov/pubmed/32516994 http://dx.doi.org/10.3390/ma13112582 |
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author | Baldermann, Andre Fleischhacker, Yvonne Schmidthaler, Silke Wester, Katharina Nachtnebel, Manfred Eichinger, Stefanie |
author_facet | Baldermann, Andre Fleischhacker, Yvonne Schmidthaler, Silke Wester, Katharina Nachtnebel, Manfred Eichinger, Stefanie |
author_sort | Baldermann, Andre |
collection | PubMed |
description | Efficient capture of barium (Ba) from solution is a serious task in environmental protection and remediation. Herein, the capacity and the mechanism of Ba adsorption by natural and iron(III) oxide (FeO) modified allophane (ALO), beidellite (BEI) and zeolite (ZEO) were investigated by considering the effects of contact time, temperature, pH, Ba(2+) concentration, adsorbent dosage, the presence of competitive ions and adsorption–desorption cycles (regenerability). Physicochemical and mineralogical properties of the adsorbents were characterized by XRD, FTIR, SEM with EDX and N(2) physisorption techniques. The Ba(2+) adsorption fitted to a pseudo-first-order reaction kinetics, where equilibrium conditions were reached within <30 min. BEI, ALO and ZEO with(out) FeO-modification yielded removal efficiencies for Ba(2+) of up to 99.9%, 97% and 22% at optimum pH (pH 7.5–8.0). Adsorption isotherms fitted to the Langmuir model, which revealed the highest adsorption capacities for BEI and FeO-BEI (44.8 mg/g and 38.6 mg/g at 313 K). Preferential ion uptake followed in the order: Ba(2+) > K(+) > Ca(2+) >> Mg(2+) for all adsorbents; however, BEI and FeO-BEI showed the highest selectivity for Ba(2+) among all materials tested. Barium removal from solution was governed by physical adsorption besides ion exchange, intercalation, surface complexation and precipitation, depending mainly on the absorbent type and operational conditions. BEI and FeO-BEI showed a high regenerability (>70–80% desorption efficiency after 5 cycles) and could be considered as efficient sorbent materials for wastewater clean-up. |
format | Online Article Text |
id | pubmed-7321624 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-73216242020-07-20 Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents Baldermann, Andre Fleischhacker, Yvonne Schmidthaler, Silke Wester, Katharina Nachtnebel, Manfred Eichinger, Stefanie Materials (Basel) Article Efficient capture of barium (Ba) from solution is a serious task in environmental protection and remediation. Herein, the capacity and the mechanism of Ba adsorption by natural and iron(III) oxide (FeO) modified allophane (ALO), beidellite (BEI) and zeolite (ZEO) were investigated by considering the effects of contact time, temperature, pH, Ba(2+) concentration, adsorbent dosage, the presence of competitive ions and adsorption–desorption cycles (regenerability). Physicochemical and mineralogical properties of the adsorbents were characterized by XRD, FTIR, SEM with EDX and N(2) physisorption techniques. The Ba(2+) adsorption fitted to a pseudo-first-order reaction kinetics, where equilibrium conditions were reached within <30 min. BEI, ALO and ZEO with(out) FeO-modification yielded removal efficiencies for Ba(2+) of up to 99.9%, 97% and 22% at optimum pH (pH 7.5–8.0). Adsorption isotherms fitted to the Langmuir model, which revealed the highest adsorption capacities for BEI and FeO-BEI (44.8 mg/g and 38.6 mg/g at 313 K). Preferential ion uptake followed in the order: Ba(2+) > K(+) > Ca(2+) >> Mg(2+) for all adsorbents; however, BEI and FeO-BEI showed the highest selectivity for Ba(2+) among all materials tested. Barium removal from solution was governed by physical adsorption besides ion exchange, intercalation, surface complexation and precipitation, depending mainly on the absorbent type and operational conditions. BEI and FeO-BEI showed a high regenerability (>70–80% desorption efficiency after 5 cycles) and could be considered as efficient sorbent materials for wastewater clean-up. MDPI 2020-06-05 /pmc/articles/PMC7321624/ /pubmed/32516994 http://dx.doi.org/10.3390/ma13112582 Text en © 2020 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 Baldermann, Andre Fleischhacker, Yvonne Schmidthaler, Silke Wester, Katharina Nachtnebel, Manfred Eichinger, Stefanie Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents |
title | Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents |
title_full | Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents |
title_fullStr | Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents |
title_full_unstemmed | Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents |
title_short | Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents |
title_sort | removal of barium from solution by natural and iron(iii) oxide-modified allophane, beidellite and zeolite adsorbents |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7321624/ https://www.ncbi.nlm.nih.gov/pubmed/32516994 http://dx.doi.org/10.3390/ma13112582 |
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