Nguyen et al. (2026): Kinetic insights into measurable marine CO₂ removal via carbonation of electrolytically alkalinized seawater

Trinh Thao My Nguyen, Arnaud Boussonnie, Aaron Sabin, Naga Boppana, Thomas Traynor, Fabian Rosner, Dante Simonetti, Gaurav Sant, Erika La Plante, IN: Chemical Engineering Journal, https://doi.org/10.1016/j.cej.2026.175396

The rising levels of atmospheric carbon dioxide (CO₂) necessitate solutions for effective mitigation strategies, such as marine CO₂ removal (mCDR). This study investigates the kinetics of aqueous carbonation of seawater that has been alkalinized. Such alkalinization is effected via the Equatic process, an electrolysis-driven method designed to enhance the precipitation of calcium carbonate and magnesium hydroxide for CO₂ removal. Carbonation was conducted using two approaches: direct (i.e., carbonation of the entire catholyte, including both solids and liquids) and sequential (i.e., carbonation of the catholyte liquid, followed by further carbonation after filtered solids are added back). These methods were employed to examine the dissolution behavior of CO₂ and brucite (Mg(OH)₂), as well as the transformation of brucite into various hydrated magnesium carbonate phases.

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