Dual Functional Materials for Carbon Capture and Water Harvesting

Climate-related resource scarcity calls for both greenhouse-gas mitigation and sustainable water-supply approaches. Current carbon capture and atmospheric water harvesting systems are typically designed as separate processes, which can increase material use, energy requirements, and system complexity. Developing a single material capable of performing both functions could provide a more efficient and scalable approach. There is a need for adaptable materials that can respond to environmental conditions while supporting sustainable carbon and water management.

 

Researchers at Arizona State University have developed dual-functional, thermoresponsive copolymer materials designed to capture water vapor and carbon dioxide directly from ambient air. The material combines a zwitterionic unit with a thermoresponsive unit to provide temperature-dependent sorption behavior: in one state it favors atmospheric water uptake, while in another it promotes carbon dioxide adsorption. The polymer network can incorporate ions to enhance water-vapor uptake and support direct air carbon capture through a moisture-swing mechanism. This single-material approach is intended to integrate atmospheric water harvesting and direct air carbon capture, with tunable sorption behavior and cycling capability described in the source materials.

 

This approach offers a scalable platform for addressing carbon management and freshwater availability using a single multifunctional material.