Single polymer sorbent fibers for high performance and rapid direct air capture

Polymers of intrinsic microporosity (PIM) fibers based on amidoxime and amine functionalities were formulated into high- performance CO2 adsorbents. Fiber sorbents were composed of a single porous polymer component as well as molecular amines to increase the CO2 capture kinetics. The highest CO2 uptake capacity (3.3 wt% CO2 at 400 ppm) among all PIM-based sorbents to date was reported. Moreover, sorbents exhibited rapid CO2 adsorption rates (5 min adsorption cycle) and cost efficient regeneration (70oC, no vacuum) which are imperative to reducing the cost of direct air capture.