Counter-Intuitive Magneto-Water-Wetting Effect to CO 2 Adsorption at Room Temperature Using MgO/Mg(OH) 2 Nanocomposites

• Published in: Materials Vol. 15; no. 3
• Main Authors: Senevirathna, Hasanthi L, Weerasinghe, P Vishakha T, Li, Xu, Tan, Ming-Yan, Kim, Sang-Sub, Wu, Ping
• Format: Journal Article
• Language: English
• Published: Switzerland 27-01-2022
• Subjects: magneto-wetting; nesquehonite; room temperature; aging; CO2 adsorption
• ISSN: 1996-1944; 1996-1944

MgO/Mg(OH)
-based materials have been intensively explored for CO
adsorption due to their high theoretical but low practical CO
capture efficiency. Our previous study on the effect of H
O wetting on CO
adsorption in MgO/Mg(OH)
nanostructures found that the presence of H
O molecules significantly increases (decreases) CO
adsorption on the MgO (Mg(OH)
) surface. Furthermore, the magneto-water-wetting technique is used to improve the CO
capture efficiency of various nanofluids by increasing the mass transfer efficiency of nanobeads. However, the influence of magneto-wetting to the CO
adsorption at nanobead surfaces remains unknown. The effect of magneto-water-wetting on CO
adsorption on MgO/Mg(OH)
nanocomposites was investigated experimentally in this study. Contrary to popular belief, magneto-water-wetting does not always increase CO
adsorption; in fact, if Mg(OH)
dominates in the nanocomposite, it can actually decrease CO
adsorption. As a result of our structural research, we hypothesized that the creation of a thin H
O layer between nanograins prevents CO
from flowing through, hence slowing down CO
adsorption during the carbon-hydration aging process. Finally, the magneto-water-wetting technique can be used to control the carbon-hydration process and uncover both novel insights and discoveries of CO
capture from air at room temperature to guide the design and development of ferrofluid devices for biomedical and energy applications.