Post by Mika Järvinen

Happy to share our fresh paper on passive DAC, direct air capture of CO2, development 🤩 We studied here a process concept where waste material from steemaking and mining industries were used as raw materials for preparing a CO2 capture sorbent to be used in passive CO2 air capture process. In all cases we studied, the process yielded a pure Ca(OH)2 precipitate suitable for cost-effective negative emission technologies, confirming the effectiveness of both solvents for the three waste products. Future research should focus on analyzing the physical properties of the Ca(OH)2 precipitate and conducting carbonation tests. Additionally, reducing solvent costs and exploring solvent regeneration will be critical for the wider applicability of these extraction methods. The long-term sustainability and economic viability of the process rely on effective solvent management. A major challenge ahead is assessing whether solvents, particularly NH4Cl, can be regenerated and reused. Future studies should explore solvent recovery techniques and strategies to minimize chemical consumption. Thank you for great collaboration Muhammad Nauman Saeed, Anna Stedt, Julian Scheer, Tobias Mattisson, Zareen Abbas and Carl Linderholm. Great collaboration between Aalto University, Chalmers University of Technology and Göteborgs universitet.