Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 5: Focus Session: Mineral-water interfaces I

O 5.1: Hauptvortrag

Montag, 9. März 2026, 10:30–11:00, HSZ/0403

Can the mineral-water interface save the world? Mineral carbonation, enhanced weathering and negative emissions — •Philip Pogge von Strandmann — Johannes Gutenberg University, Mainz

The rising atmospheric CO2 concentrations are clearly having a significant impact on the climate, and will continue to do so. The currently only foreseeable method by which anthropogenic climate change will not be completely catastrophic (i.e. limited to 1.5-2°C warming), is if we implement global "negative emissions" technologies, that is the artificial removal of CO2. Two such technologies directly rely on the mineral-water interface: mineral carbonation and enhanced weathering. Both require the dissolution of silicate minerals in mildly acidic water, and the subsequent precipitation of carbonate secondary minerals, but without too much precipitation of silicate secondary minerals, which hinder the reaction. In fact, the reaction is more complex than that, because numerous reactions occur at the mineral-water interface: dissolution, sorption, exchange, co-precipitation and incorporation into interstitial sites in mineral lattices. Each of these reactions has significant consequences for the efficiency of the reaction and the CO2 drawdown. This presentation will examine these reactions, including the aspects we currently understand and can measure, and those where our knowledge and analytical abilities are still lacking.

Keywords: CO2 sequestration; Mineral dissolution; Precipitation; Dynamic equilibrium