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Improving atmospheric water harvesting in carbon-based sorbents through CO₂ activation

David Brassard, Seyedemad Alavitabari, Wendell Raphael, Richard Boudreault, Pierre‐Luc Girard‐Lauriaut and Jason Robert Tavares

Article (2024)

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Abstract

Atmospheric water harvesting (AWH) can serve as an alternative fresh water source in regions with scarce access to drinking water. While many techniques are geographically or seasonally limited, sorbent-based AWH shows the potential for wider application. Low-cost, carbon-based sorbents named nanoporous sponges (NPS) are recently developed, exhibiting fast and repeatable water uptake of 0.14 g g⁻¹ at 90% relative pressure. While useful from a cost and daily water yield point of view, there is room for improvement. This article presents an improved production process combining pyrolysis and activation under CO₂ in a single step, yielding improved NPS capable of reproducibly reaching a water uptake of 0.47 g g⁻¹ at 95% relative pressure while maintaining fast sorption rates. The NPS show significant endurance and are able to maintain stable performance over numerous humidity cycles. An unexpected time-dependant sorption behavior is also identified for NPS produced with a modified synthesis formulation, due to an increase in sodium carbonate residual content.

Uncontrolled Keywords

adsorbents; atmospheric water harvesting; carbon-based sorbents; resorcinol-formaldehyde

Department: Department of Chemical Engineering
Research Center: CREPEC - Center for Applied Research on Polymers and Composites
Funders: Mitacs, NSERC Alliance, PRIMA Québec, Awn Nanotech Inc.
Grant number: IT32544
PolyPublie URL: https://publications.polymtl.ca/56758/
Journal Title: Advanced Sustainable Systems (vol. 8, no. 1)
Publisher: Wiley
DOI: 10.1002/adsu.202300309
Official URL: https://doi.org/10.1002/adsu.202300309
Date Deposited: 25 Jan 2024 15:17
Last Modified: 08 Apr 2024 00:59
Cite in APA 7: Brassard, D., Alavitabari, S., Raphael, W., Boudreault, R., Girard‐Lauriaut, P.‐L., & Tavares, J. R. (2024). Improving atmospheric water harvesting in carbon-based sorbents through CO₂ activation. Advanced Sustainable Systems, 8(1), 2300309 (10 pages). https://doi.org/10.1002/adsu.202300309

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