Researchers Upcycle Polystyrene Waste Into Carbon Capture Sponge Material
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A team at Aarhus University has demonstrated a method to upcycle discarded polystyrene into a carbon sponge material capable of capturing CO2 from the air, potentially addressing two environmental problems simultaneously: plastic waste and atmospheric carbon. The process converts polystyrene into a solid amine-based material that acts like a sponge for CO2 molecules, which can be released when heated or depressurized, allowing the material to be reused. Solid amine carbon capture materials are already used in various carbon capture systems, but the innovation here is using waste polystyrene as the feedstock, which could significantly reduce the cost of producing these materials. The research was published on June 8, 2026.
Technical significance
The conversion of polystyrene waste into carbon capture material represents a potential two-for-one environmental solution: reducing plastic pollution while providing lower-cost materials for direct air capture systems. If scalable, this could reduce the cost of solid amine carbon capture media by using waste plastic as a feedstock rather than purpose-built polymers. For the carbon capture industry, cheaper sorbent materials could improve the economics of direct air capture, which currently costs $250-600 per ton of CO2 removed.