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A generalised competitive adsorption theory of non-ideal substances
Dissertation (Ph. D.) -- University of Stellenbosch, 1995.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613895631306752 |
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| access_status_str | Open Access |
| author | De Kock, Felix Petrus |
| author2 | Van Deventer, J. S. J. |
| author_browse | De Kock, Felix Petrus Van Deventer, J. S. J. |
| author_facet | Van Deventer, J. S. J. De Kock, Felix Petrus |
| author_sort | De Kock, Felix Petrus |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Dissertation (Ph. D.) -- University of Stellenbosch, 1995. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/54635 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:43:25.190Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/54635 A generalised competitive adsorption theory of non-ideal substances De Kock, Felix Petrus Van Deventer, J. S. J. Stellenbosch University. Faculty of Engineering. Dept. of Chemical Engineering. Adsorption Ion exchange Separation (Technology) Carbon, Activated Surface chemistry Dissertations -- Engineering Dissertation (Ph. D.) -- University of Stellenbosch, 1995. A review of the most prominent models used to describe adsorption equilibria was conducted. This was done by outlining the approaches already attempted, and by identifying their fields of application as well as their strong and weak points. A brief reveiew of statistical thermodynamics and its relationship to classical thermodynamics is given to establish the theoretical background. It is shown how the principles of statistical thermodynamics can be used to predict thermodynamic behaviour using a Monte Carlo approach. It was also shown how a statistical thermodynamic approach can be used to model adsorption equilibria of well defined adsorption systems. Based on the principles used during a Monte Carlo simulation (using statistical thermodynamics) a new method for predicting equilibria is proposed along the lines of the mean field theory. In its simplest form, this method describes the competitive adsorption of equally-sized species onto a homogeneous surface without any interaction or precipitation occuring. It is then demonstrated how this approach can be expanded to include most non-ideal influences such as lateral interactions, heterogeneuos surfaces, different molecular sizes, selective adsorption and irreversible adsorption. A sensitivity analysis is perfoormed to demonstrate how the predictions obtained using the proposed method coincide with experimentally-obtained system behaviour as well as thermodynamics constraints. Examples of the demonstrated behaviour are the azeotropic behaviour caused by stabilising interaction energies, the effect of different species sizes on the separation as well as the effect of selective adsorption on the equilibrium loading. Since this method is thermodynamically consistent, it can be used as a tool to evaluate other methods currently used in the description of equilibrium. In the hydrometallurgical industry, the description of adsorption equilibria of dissociated species onto adsorbents such as activaated carbon is done mainly by using emperical or semi-emperical isotherm equations. Although these equations have no or very little theoretical justification, the work reasonably well under "normal" situations. Doctoral 2012-08-27T11:36:39Z 2012-08-27T11:36:39Z 1995 Thesis http://hdl.handle.net/10019.1/54635 en Stellenbosch University 240 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Adsorption Ion exchange Separation (Technology) Carbon, Activated Surface chemistry Dissertations -- Engineering De Kock, Felix Petrus A generalised competitive adsorption theory of non-ideal substances |
| title | A generalised competitive adsorption theory of non-ideal substances |
| title_full | A generalised competitive adsorption theory of non-ideal substances |
| title_fullStr | A generalised competitive adsorption theory of non-ideal substances |
| title_full_unstemmed | A generalised competitive adsorption theory of non-ideal substances |
| title_short | A generalised competitive adsorption theory of non-ideal substances |
| title_sort | generalised competitive adsorption theory of non ideal substances |
| topic | Adsorption Ion exchange Separation (Technology) Carbon, Activated Surface chemistry Dissertations -- Engineering |
| url | http://hdl.handle.net/10019.1/54635 |
| work_keys_str_mv | AT dekockfelixpetrus ageneralisedcompetitiveadsorptiontheoryofnonidealsubstances AT dekockfelixpetrus generalisedcompetitiveadsorptiontheoryofnonidealsubstances |