Issue 4, 2024

Nanoscale control over water-film thickness using temperature modulation: tuning mineral carbonation reactivity

Abstract

Induced temperature gradients within a high-pressure reactor were used to assess how the thickness of nanoscale water films affect the carbonation of forsterite, Mg2SiO4, in water-saturated supercritical carbon dioxide (scCO2). Water monolayer (ML) coverages on the mineral surface were estimated by in situ infrared spectroscopy and were shown to increase nearly exponentially from approximately 5 to 170 ML when the forsterite region was cooled from +0.5 to −0.3 °C relative to a nearby pool of excess water. Carbonation rates and extents were strongly dependent on the water film thickness, with the highest rates and complete mineral conversion occurring within 40 h under bulk-like water coverages. Reaction passivation, possibly due to a reduction in reactive surface area, was observed for thinner water films ranging from 5–53 ML. Temperature modulation can be an effective technique for investigating basalt reactivity over a range of water coverages in humidified scCO2.

Graphical abstract: Nanoscale control over water-film thickness using temperature modulation: tuning mineral carbonation reactivity

Supplementary files

Article information

Article type
Communication
Submitted
30 Nov. 2023
Accepted
26 Febr. 2024
First published
06 Marts 2024
This article is Open Access
Creative Commons BY-NC license

Environ. Sci.: Nano, 2024,11, 1412-1416

Nanoscale control over water-film thickness using temperature modulation: tuning mineral carbonation reactivity

C. J. Thompson, S. T. Mergelsberg, B. P. Rajan, P. F. Martin, S. N. Kerisit and J. S. Loring, Environ. Sci.: Nano, 2024, 11, 1412 DOI: 10.1039/D3EN00884C

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party commercial publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements