Enhanced Direct Air Capture of CO2 by Mg-minerals using organic additives

This project is financed by the Kempe foundations

Research question

This research investigates whether organic ligands can outcompete carbonate ions for Mg2+ binding and redirect mineral growth pathways during CO2 capture. The reactions occur within nanometer-thick water films that form when atmospheric moisture condenses on MgO nanoparticles. By altering the structure and hydration of Mg2+-containing prenucleation clusters, organic complexation may prevent the formation of impermeable carbonate nanocoatings that currently limit CO2 capture efficiency. The study tests ligands with different binding strengths and molecular geometries to establish how these molecular-scale interactions control mineral growth rates, crystal morphologies, and overall direct air capture performance. Reactions will be monitored using in situ vibrational spectroscopy and X-ray diffraction, with ex situ analysis by X-ray photoelectron spectroscopy and electron microscopy.

Sustainability aspects

The project directly addresses climate change mitigation by developing passive CO2 capture technology that requires minimal energy input and repurposes mining waste materials. It aligns with UN Sustainable Development Goals 8 and 12 by promoting resource reuse and responsible consumption. The approach avoids energy-intensive grinding processes, reduces air pollution from dust generation, and produces climate-neutral concrete materials. The organic additives are environmentally compatible and applied only to contained mining sites, minimizing ecosystem disruption while maximizing CO2 removal from the atmosphere.