Mulders, JJPA;
Harrison, AL;
Christ, J;
Oelkers, EH;
(2018)
Non-stoichiometric dissolution of sepiolite.
Energy Procedia
, 146
pp. 74-80.
10.1016/j.egypro.2018.07.011.
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Abstract
Sepiolite is one of the few Mg-phyllosilicates thought to precipitate at Earth’s near-surface conditions, and in hydrothermal systems. Understanding the dissolution mechanisms of sepiolite can elucidate Mg-silicate dissolution processes in general and can provide a better estimation of the availability of divalent cations for CO2 sequestration. Batch experiments containing sepiolite were conducted over a pH range of 3.6-10.4, and the changes in Si/Mg ratio in solution were measured over time. The reaction products were analyzed with scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. Under all conditions sepiolite dissolution proved to be non-stoichiometric, where Mg was preferentially released under acidic and neutral conditions, while Si was preferentially released in alkaline solutions. Under acidic and neutral conditions, sepiolite could thus release ample divalent cations for CO2 sequestration.
| Type: | Article |
|---|---|
| Title: | Non-stoichiometric dissolution of sepiolite |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.egypro.2018.07.011 |
| Publisher version: | https://doi.org/10.1016/j.egypro.2018.07.011 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Non-stoichemetric dissolution, divalent metal releasese, piolite |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10057663 |
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