A Universal Isotherm Model to Capture Adsorption Uptake and Energy Distribution of Porous Heterogeneous Surface

Handle URI:
http://hdl.handle.net/10754/625447
Title:
A Universal Isotherm Model to Capture Adsorption Uptake and Energy Distribution of Porous Heterogeneous Surface
Authors:
Ng, Kim Choon ( 0000-0003-3930-4127 ) ; Burhan, Muhammad; Shahzad, Muhammad Wakil; Ismail, Azahar Bin
Abstract:
The adsorbate-adsorbent thermodynamics are complex as it is influenced by the pore size distributions, surface heterogeneity and site energy distribution, as well as the adsorbate properties. Together, these parameters defined the adsorbate uptake forming the state diagrams, known as the adsorption isotherms, when the sorption site energy on the pore surfaces are favorable. The available adsorption models for describing the vapor uptake or isotherms, hitherto, are individually defined to correlate to a certain type of isotherm patterns. There is yet a universal approach in developing these isotherm models. In this paper, we demonstrate that the characteristics of all sorption isotherm types can be succinctly unified by a revised Langmuir model when merged with the concepts of Homotattic Patch Approximation (HPA) and the availability of multiple sets of site energy accompanied by their respective fractional probability factors. The total uptake (q/q*) at assorted pressure ratios (P/P s ) are inextricably traced to the manner the site energies are spread, either naturally or engineered by scientists, over and across the heterogeneous surfaces. An insight to the porous heterogeneous surface characteristics, in terms of adsorption site availability has been presented, describing the unique behavior of each isotherm type.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)
Citation:
Ng KC, Burhan M, Shahzad MW, Ismail AB (2017) A Universal Isotherm Model to Capture Adsorption Uptake and Energy Distribution of Porous Heterogeneous Surface. Scientific Reports 7. Available: http://dx.doi.org/10.1038/s41598-017-11156-6.
Publisher:
Springer Nature
Journal:
Scientific Reports
Issue Date:
31-Aug-2017
DOI:
10.1038/s41598-017-11156-6
Type:
Article
ISSN:
2045-2322
Additional Links:
https://www.nature.com/articles/s41598-017-11156-6
Appears in Collections:
Articles; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorNg, Kim Choonen
dc.contributor.authorBurhan, Muhammaden
dc.contributor.authorShahzad, Muhammad Wakilen
dc.contributor.authorIsmail, Azahar Binen
dc.date.accessioned2017-09-14T06:03:51Z-
dc.date.available2017-09-14T06:03:51Z-
dc.date.issued2017-08-31en
dc.identifier.citationNg KC, Burhan M, Shahzad MW, Ismail AB (2017) A Universal Isotherm Model to Capture Adsorption Uptake and Energy Distribution of Porous Heterogeneous Surface. Scientific Reports 7. Available: http://dx.doi.org/10.1038/s41598-017-11156-6.en
dc.identifier.issn2045-2322en
dc.identifier.doi10.1038/s41598-017-11156-6en
dc.identifier.urihttp://hdl.handle.net/10754/625447-
dc.description.abstractThe adsorbate-adsorbent thermodynamics are complex as it is influenced by the pore size distributions, surface heterogeneity and site energy distribution, as well as the adsorbate properties. Together, these parameters defined the adsorbate uptake forming the state diagrams, known as the adsorption isotherms, when the sorption site energy on the pore surfaces are favorable. The available adsorption models for describing the vapor uptake or isotherms, hitherto, are individually defined to correlate to a certain type of isotherm patterns. There is yet a universal approach in developing these isotherm models. In this paper, we demonstrate that the characteristics of all sorption isotherm types can be succinctly unified by a revised Langmuir model when merged with the concepts of Homotattic Patch Approximation (HPA) and the availability of multiple sets of site energy accompanied by their respective fractional probability factors. The total uptake (q/q*) at assorted pressure ratios (P/P s ) are inextricably traced to the manner the site energies are spread, either naturally or engineered by scientists, over and across the heterogeneous surfaces. An insight to the porous heterogeneous surface characteristics, in terms of adsorption site availability has been presented, describing the unique behavior of each isotherm type.en
dc.publisherSpringer Natureen
dc.relation.urlhttps://www.nature.com/articles/s41598-017-11156-6en
dc.rightsThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleA Universal Isotherm Model to Capture Adsorption Uptake and Energy Distribution of Porous Heterogeneous Surfaceen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.identifier.journalScientific Reportsen
dc.eprint.versionPublisher's Version/PDFen
kaust.authorNg, Kim Choonen
kaust.authorBurhan, Muhammaden
kaust.authorShahzad, Muhammad Wakilen
kaust.authorIsmail, Azahar Binen
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