The capture,regeneration,and conversion of CO_(2)from ambient air and flue gas streams are critical aspects of mitigating global warming.Solid sorbents for CO_(2)absorption are very promising as they have high mass tr...The capture,regeneration,and conversion of CO_(2)from ambient air and flue gas streams are critical aspects of mitigating global warming.Solid sorbents for CO_(2)absorption are very promising as they have high mass transfer areas without energy input and reduce emissions and minimize corrosion as compared to liquid sorbents.However,precisely tunable solid CO_(2)sorbents are difficult to produce.Here,we demonstrate the high-throughput production of hydrogel-based CO_(2)-absorbing particles via liquid jetting.By wrapping a liquid jet consisting of an aqueous solution of cross-linkable branched polyethylenimine(PEI)with a layer of suspension containing hydrophobic silica nanoparticles,monodisperse droplets with a silica nanoparticle coating layer was formed in the air.A stable Pickering emulsion containing PEI droplets was obtained after these ejected droplets were collected in a heated oil bath.The droplets turn into mm-sized particles after thermal curing in the bath.The diameter,PEI content,and silica content of the particles were systematically varied,and their CO_(2)absorption was measured as a function of time.Steam regeneration of the particles enabled cyclic testing,revealing a CO_(2)absorption capacity of 6.5±0.5 mol kg^(−1)solid PEI in pure CO_(2)environments and 0.7±0.3 mol kg^(−1)solid PEI for direct air capture.Several thousands of particles were produced per second at a rate of around 0.5 kg per hour,with a single nozzle.This process can be further scaled by parallelization.The complete toolbox for the design,fabrication,testing,and regeneration of functional hydrogel particles provides a powerful route toward novel solid sorbents for regenerative CO_(2)capture.展开更多
基金supported by the European Regional Development Fund(CONTROL,EFRO#00943).
文摘The capture,regeneration,and conversion of CO_(2)from ambient air and flue gas streams are critical aspects of mitigating global warming.Solid sorbents for CO_(2)absorption are very promising as they have high mass transfer areas without energy input and reduce emissions and minimize corrosion as compared to liquid sorbents.However,precisely tunable solid CO_(2)sorbents are difficult to produce.Here,we demonstrate the high-throughput production of hydrogel-based CO_(2)-absorbing particles via liquid jetting.By wrapping a liquid jet consisting of an aqueous solution of cross-linkable branched polyethylenimine(PEI)with a layer of suspension containing hydrophobic silica nanoparticles,monodisperse droplets with a silica nanoparticle coating layer was formed in the air.A stable Pickering emulsion containing PEI droplets was obtained after these ejected droplets were collected in a heated oil bath.The droplets turn into mm-sized particles after thermal curing in the bath.The diameter,PEI content,and silica content of the particles were systematically varied,and their CO_(2)absorption was measured as a function of time.Steam regeneration of the particles enabled cyclic testing,revealing a CO_(2)absorption capacity of 6.5±0.5 mol kg^(−1)solid PEI in pure CO_(2)environments and 0.7±0.3 mol kg^(−1)solid PEI for direct air capture.Several thousands of particles were produced per second at a rate of around 0.5 kg per hour,with a single nozzle.This process can be further scaled by parallelization.The complete toolbox for the design,fabrication,testing,and regeneration of functional hydrogel particles provides a powerful route toward novel solid sorbents for regenerative CO_(2)capture.
