Zhang et al. (2025): Modeling and Feasibility Assessment of Mineral Carbonation Based on Biological pH Swing for Atmospheric CO₂ Removal
Yukun Zhang, Spencer Long, Manon T. Duret, Liam A. Bullock, Phyllis Lam and Aidong Yang, IN: ACS Sustainable Chemistry & Engineering, https://doi.org/10.1021/acssuschemeng.4c10708
This study investigates a novel biological pH swing strategy for mineral carbonation at ambient conditions as a potential option for atmospheric CO₂ removal. Through mathematical modeling, the authors evaluated a mineral carbonation system that utilized Desulfovibrio vulgaris and Acidithiobacillus thiooxidans to achieve alternating sulfur reduction and oxidation, respectively, with the cyclic process to effect pH swing for promoting the dissolution of a silicate mineral and the subsequent precipitation of a carbonate mineral to store CO₂. Sulfur cycles employing two reduced compounds, namely, hydrogen sulfide and thiosulfate, were compared.