Projects per year
Abstract
Carbonation of hydrous minerals such as calcium hydroxide (Ca(OH)2) is an important process in environmental and industrial applications for the construction industry, geological disposal repositories for nuclear waste, and green technologies for carbon capture. Although the role of ions during the carbonation mechanism of Ca(OH)2 is still unclear, we identified the exchange of ions during the dissolution and precipitation process, by determining the change in isotopic composition of carbonation products using time-of-flight-secondary ion mass spectrometry. Our samples of pure Ca(18OH)2 carbonated in air were characterized using scanning electron microscopy and Raman spectroscopy, aided by density functional theory calculations. Our results show that the carbonation process at high pH is a two-stage mechanism. The first stage occurs in a short time after Ca(18OH)2 is exposed to air and involved the dissolution of surface Ca ions and hydroxyl 18OH groups, which reacts directly with dissolved CO2, leading to 1/3 of 18O in the oxygen content of carbonate phases. The second stage occurs within 24 h of exposure allowing a rebalance of the oxygen isotopic composition of the carbonate phases with a higher content of 16O.
Original language | English |
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Pages (from-to) | 1036-1044 |
Number of pages | 9 |
Journal | Crystal Growth and Design |
Volume | 17 |
Issue number | 3 |
Early online date | 2 Feb 2017 |
DOIs | |
Publication status | Published - 1 Mar 2017 |
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Dive into the research topics of 'Carbonation of Hydrous Materials at the Molecular Level: A Time of Flight-Secondary Ion Mass Spectrometry, Raman and Density Functional Theory Study'. Together they form a unique fingerprint.Projects
- 1 Finished
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Experimentally Verfied Atomistic Modelling of Lime in Construction Materials
Ball, R. (PI) & Parker, S. (CoI)
Engineering and Physical Sciences Research Council
3/06/13 → 2/12/16
Project: Research council
Profiles
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Richard Ball
- Department of Architecture & Civil Engineering - Reader
- Centre for Sustainable Chemical Technologies (CSCT)
- Centre for Integrated Materials, Processes & Structures (IMPS)
- Centre for Climate Adaptation & Environment Research (CAER)
- Centre for Regenerative Design & Engineering for a Net Positive World (RENEW)
Person: Research & Teaching, Core staff, Affiliate staff
Datasets
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Data set for Carbonation of Hydrous Materials at the Molecular Level: a ToF-SIMS, Raman and DFT Study
Grant, J. (Creator), Pesce, G. (Creator), Parker, S. (Creator), Molinari, M. (Creator) & Ball, R. (Creator), University of Bath, 2 Feb 2017
DOI: 10.15125/BATH-00240
Dataset
Equipment
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High Performance Computing (HPC) Facility
Chapman, S. (Manager)
University of BathFacility/equipment: Facility
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MC2-Electron Microscopy (EM)
Material and Chemical Characterisation (MC2)Facility/equipment: Technology type
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MC2- Surface analysis and spectroscopy
Material and Chemical Characterisation (MC2)Facility/equipment: Technology type