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Formation thermodynamics of layered double hydroxides
Dissertation (MEng (Chemical Engineering))--University of Pretoria, 2025.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2026
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| _version_ | 1869484035094347776 |
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| access_status_str | Open Access |
| author2 | Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus)
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| author_browse | Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus)
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| author_facet | Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus)
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| collection | Thesis |
| dc_rights_str_mv | © 2024 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng (Chemical Engineering))--University of Pretoria, 2025. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/107788 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-07-01T04:08:29.201Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2026 |
| publishDateRange | 2026 |
| publishDateSort | 2026 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/107788 Formation thermodynamics of layered double hydroxides Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus) hanno.muire@tuks.co.za Zietsman, Johan Hendrik Muire, Hanno UCTD Sustainable Development Goals (SDGs) Thermochemistry Formation thermodynamics Modelling Layered double hydroxides Sustainable synthesis methods Dissertation (MEng (Chemical Engineering))--University of Pretoria, 2025. This research delves into the thermochemistry of layered double hydroxides (LDHs), with hydrotalcite as a key representative of this class of anionic clay compounds. LDHs are characterised by their brucite-like layers, generally composed of divalent and trivalent metal cations intercalated with anions such as carbonate to maintain charge balance. These materials have garnered significant interest due to their versatile applications in environmental remediation, catalysis, and materials science. The synthesis of LDHs is typically carried out through co-precipitation, urea hydrolysis, and hydrothermal dissolution-precipitation. Co-precipitation is the most commonly used due to its simplicity and efficiency. However, it presents challenges, including the high cost of metal salts and the generation of environmentally harmful effluents. In response to these challenges, the study explores more sustainable synthesis methods, focusing on hydrothermal dissolution-precipitation reactions that utilise metal oxides and hydroxides. However, these methods require careful optimisation due to the low solubility of the reactants. A key aspect of this research is the role of water in LDHs, which can appear in various forms, such as adsorbed, intercalated, and excess water. The type and presence of bound water have a significant impact on the stability, formation, and thermodynamic properties of LDHs. This study applies the thermodynamic difference rule (TDR) method to a set of experimental enthalpy data for LDHs, aiming to show that bound water behaves in an ice-like state. To validate this, the TDR method is compared with the simpler additive approach of mechanical mixture models, demonstrating its accuracy in estimating thermodynamic properties, even when the precise amount of bound water is uncertain. By enhancing the understanding of LDH thermochemistry, particularly the role of bound water, this research offers a stepping stone to improve current synthesis methods, develop novel and more sustainable processes, and reduce the need for extensive experimental trials. Ultimately, the study aims to contribute to the broader goal of advancing environmentally friendly practices in synthesising LDHs while also providing reliable thermodynamic data that can be used in modelling and simulation efforts for these important materials. Chemical Engineering MEng (Chemical Engineering) Unrestricted Faculty of Engineering, Built Environment and Information Technology SDG-09: Industry, innovation and infrastructure SDG-12: Responsible consumption and production 2026-02-03T06:10:32Z 2026-02-03T06:10:32Z 2026-05 2025 Dissertation * A2026 http://hdl.handle.net/2263/107788 10.25403/UPresearchdata.31236142 en © 2024 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Sustainable Development Goals (SDGs) Thermochemistry Formation thermodynamics Modelling Layered double hydroxides Sustainable synthesis methods Formation thermodynamics of layered double hydroxides |
| title | Formation thermodynamics of layered double hydroxides |
| title_full | Formation thermodynamics of layered double hydroxides |
| title_fullStr | Formation thermodynamics of layered double hydroxides |
| title_full_unstemmed | Formation thermodynamics of layered double hydroxides |
| title_short | Formation thermodynamics of layered double hydroxides |
| title_sort | formation thermodynamics of layered double hydroxides |
| topic | UCTD Sustainable Development Goals (SDGs) Thermochemistry Formation thermodynamics Modelling Layered double hydroxides Sustainable synthesis methods |
| url | http://hdl.handle.net/2263/107788 |