@misc{10481/97664,
year = {2024},
month = {11},
url = {https://hdl.handle.net/10481/97664},
abstract = {Carbon capture and utilisation has attracted significant interest due to increasing
concerns about global warming. Mineral trapping viaMgCO3 precipitation is a promising
strategy, though restricted by the slow rate of magnesite (MgCO3) formation
and high temperatures needed to avoid the formation of hydrated minerals.
Amorphous magnesium carbonate (AMC) is a transient phase, determining the characteristics
of the final crystalline MgCO3 phase(s). Research has focused on accelerating
MgCO3 formation using additives, but their modus operandi is not completely
understood. Here, AMC titration experiments were conducted at constant pH, monitoring
solution transmittance, conductivity, and species size evolution to clarify the
effect of citrate on the initial steps of MgCO3 precipitation. We demonstrate that citrate,
similar to more complex additives, alters the hydration of free ions relative to ion associates, thereby destabilising prenucleation
ion associates and delaying AMC nucleation. The system is thus forced to go through liquid–liquid separation before the
formation of the solid, resulting in amorphous and crystalline phases with lower water content, which are more stable and efficient
for C storage, having a positive impact on the cost of CO2 mineralisation.},
organization = {EC (ACT_ERA NET no.
691712, PCI2019-111931-2 and H2020 Programme, Marie
Skłodowska-Curie Action ETN-ITN SUBlime, grant agreement
n° 955986)},
organization = {Spanish Government (grant PID2021-
125305NB-I00)},
organization = {Junta de Andalucía (research group RNM-179
and grant P20_00675)},
organization = {University of Granada (Unidad
Científica de Excelencia UCE-PP2016-05)},
publisher = {European Association of Geochemistry},
title = {Additive impact on early-stage magnesium carbonate mineralisation},
doi = {10.7185/geochemlet.2441},
author = {Santoro De Vico, F. and Bonilla-Correa, Sarah and Pelayo Punzano, Gloria and Elert, Kerstin and Rodríguez Navarro, Carlos Manuel and Ruiz Agudo, Encarnación},
}