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Explorations on Thermodynamic and Kinetic Performances of Various Cationic Exchange Durations for Synthetic Clinoptilolite
Various cation–exchanged clinoptilolites (M–CPs, M = Li(+), Cs(+), Ca(2+), Sr(2+)) were prepared, and their exchanged thermodynamic (and kinetic) properties and adsorption performances for CH(4), N(2), and CO(2) were investigated. The results demonstrated that the relative crystallinity of M–CP(S) d...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9024986/ https://www.ncbi.nlm.nih.gov/pubmed/35458797 http://dx.doi.org/10.3390/molecules27082597 |
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author | Wang, Keling Jia, Bingying Li, Yehong Sun, Jihong Wu, Xia |
author_facet | Wang, Keling Jia, Bingying Li, Yehong Sun, Jihong Wu, Xia |
author_sort | Wang, Keling |
collection | PubMed |
description | Various cation–exchanged clinoptilolites (M–CPs, M = Li(+), Cs(+), Ca(2+), Sr(2+)) were prepared, and their exchanged thermodynamic (and kinetic) properties and adsorption performances for CH(4), N(2), and CO(2) were investigated. The results demonstrated that the relative crystallinity of M–CP(S) decreased with the increase of exchange times. Their chemisorbed water weight loss gradually increased with the increasing exchange times, except that of Cs–x–CP. The Δ(r) [Formula: see text] values of exchange process of Li(+), Cs(+), Ca(2+), or Sr(2) presented the increased trend with the enhanced exchange times, but they decreased as the temperature increased. The negative Δ(r) [Formula: see text] values and the positive Δ(r) [Formula: see text] and Δ(r) [Formula: see text] values suggested that the exchanged procedure belonged to spontaneous, endothermic, and entropy-increasing behaviors; their kinetic performances followed a pseudo–second–order model. However, the calculated E(a) values of exchange process showed the increased tendencies with the enhanced exchange times, indicating that the exchange process became more difficult. Finally, the preliminary adsorption results indicated that the maximum adsorption amount at 273 K and 1 bar was 0.51 mmol/g of CH(4) and 0.38 mmol/g of N(2) by (Na, K)–CP, and 2.32 mmol/g of CO(2) by Li–6–CP. |
format | Online Article Text |
id | pubmed-9024986 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-90249862022-04-23 Explorations on Thermodynamic and Kinetic Performances of Various Cationic Exchange Durations for Synthetic Clinoptilolite Wang, Keling Jia, Bingying Li, Yehong Sun, Jihong Wu, Xia Molecules Article Various cation–exchanged clinoptilolites (M–CPs, M = Li(+), Cs(+), Ca(2+), Sr(2+)) were prepared, and their exchanged thermodynamic (and kinetic) properties and adsorption performances for CH(4), N(2), and CO(2) were investigated. The results demonstrated that the relative crystallinity of M–CP(S) decreased with the increase of exchange times. Their chemisorbed water weight loss gradually increased with the increasing exchange times, except that of Cs–x–CP. The Δ(r) [Formula: see text] values of exchange process of Li(+), Cs(+), Ca(2+), or Sr(2) presented the increased trend with the enhanced exchange times, but they decreased as the temperature increased. The negative Δ(r) [Formula: see text] values and the positive Δ(r) [Formula: see text] and Δ(r) [Formula: see text] values suggested that the exchanged procedure belonged to spontaneous, endothermic, and entropy-increasing behaviors; their kinetic performances followed a pseudo–second–order model. However, the calculated E(a) values of exchange process showed the increased tendencies with the enhanced exchange times, indicating that the exchange process became more difficult. Finally, the preliminary adsorption results indicated that the maximum adsorption amount at 273 K and 1 bar was 0.51 mmol/g of CH(4) and 0.38 mmol/g of N(2) by (Na, K)–CP, and 2.32 mmol/g of CO(2) by Li–6–CP. MDPI 2022-04-18 /pmc/articles/PMC9024986/ /pubmed/35458797 http://dx.doi.org/10.3390/molecules27082597 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Wang, Keling Jia, Bingying Li, Yehong Sun, Jihong Wu, Xia Explorations on Thermodynamic and Kinetic Performances of Various Cationic Exchange Durations for Synthetic Clinoptilolite |
title | Explorations on Thermodynamic and Kinetic Performances of Various Cationic Exchange Durations for Synthetic Clinoptilolite |
title_full | Explorations on Thermodynamic and Kinetic Performances of Various Cationic Exchange Durations for Synthetic Clinoptilolite |
title_fullStr | Explorations on Thermodynamic and Kinetic Performances of Various Cationic Exchange Durations for Synthetic Clinoptilolite |
title_full_unstemmed | Explorations on Thermodynamic and Kinetic Performances of Various Cationic Exchange Durations for Synthetic Clinoptilolite |
title_short | Explorations on Thermodynamic and Kinetic Performances of Various Cationic Exchange Durations for Synthetic Clinoptilolite |
title_sort | explorations on thermodynamic and kinetic performances of various cationic exchange durations for synthetic clinoptilolite |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9024986/ https://www.ncbi.nlm.nih.gov/pubmed/35458797 http://dx.doi.org/10.3390/molecules27082597 |
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