Abstract
Hydrosodalites are a family of zeolitic materials which have a diverse range of possible applications such as water desalination. Typical synthesis methods are relatively complex, using hydrothermal production and pre-processing and it is desirable to use lower energy and more cost-effective processing routes. For the first time, a low temperature, non-hydrothermal synthesis procedure for hydrosodalites, compatible with extrusion processing, is demonstrated. Kaolinite precursor, without calcination, was activated with a sodium hydroxide solution and formed at a workability consistent with extrusion. The cured samples were characterised using a range of advanced analytical techniques including PXRD, SEM, TGA, 27Al and 29Si-MAS-NMR, and FTIR to confirm and quantify conversion of the precursor to product phases. The synthesis consistently formed a 8:2:2 basic hydroxysodalite phase and the reaction was shown to follow a largely linear relationship with Na:Al until full conversion to the hydrosodalite phase was approached. The hydrosodalite became more ordered for Na:Al ≥ 1. There is good agreement between quantitative measurements made using PXRD, TGA and 29Si-MAS-NMR methods, providing confidence in the results. It has been shown that it is possible to synthesise hydrosodalite materials in a consistent and predictable manner, using non-hydrothermal methods, at the viscosity used for extrusion processing. This novel processing route could reduce production costs, production impacts and open up new applications for this important family of materials.
Original language | English |
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Pages (from-to) | 125-132 |
Number of pages | 8 |
Journal | Microporous and Mesoporous Materials |
Volume | 264 |
Early online date | 16 Jan 2018 |
DOIs | |
Publication status | Published - 1 Jul 2018 |
Keywords
- Hydrosodalite
- Kaolinite
- Alkali activation
- Extrusion
ASJC Scopus subject areas
- Materials Chemistry
- Inorganic Chemistry
- Civil and Structural Engineering
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Dive into the research topics of 'A mild conditions synthesis route to produce hydrosodalite from kaolinite, compatible with extrusion processing'. Together they form a unique fingerprint.Profiles
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Mark Evernden
- Department of Architecture & Civil Engineering - Senior Lecturer
- Centre for Regenerative Design & Engineering for a Net Positive World (RENEW)
Person: Research & Teaching, Core staff
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Andrew Heath
- Department of Architecture & Civil Engineering - Head of Department
- IAAPS: Propulsion and Mobility
- Centre for Climate Adaptation & Environment Research (CAER)
Person: Research & Teaching, Core staff
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Pete Walker
- Department of Architecture & Civil Engineering - Professor
- Institute for Sustainable Energy and the Environment
- Building Research Park
- Centre for Doctoral Training in Decarbonisation of the Built Environment (dCarb)
- Institute of Sustainability and Climate Change
- Centre for Climate Adaptation & Environment Research (CAER)
Person: Research & Teaching, Core staff
Datasets
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Dataset for "A mild conditions synthesis route to produce hydrosodalite from kaolinite, compatible with extrusion processing"
Marsh, A. (Creator) & Patureau, P. (Researcher), University of Bath, 7 Feb 2019
DOI: 10.15125/BATH-00590
Dataset
Equipment
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Thermogravimetric Analyser coupled to a Mass Spectrometer (TGA-MS)
Material and Chemical Characterisation (MC2)Facility/equipment: Equipment