Rapid CO₂ capture from ambient air by sorbent‐containing porous electrospun fibers made with the solvothermal polymer additive removal technique

Abstract

Direct air capture (DAC) of CO 2 is an emerging technology in the battle against climate change. Many sorbent materials and different technologies such as moisture swing sorption have been explored for this application. However, developing efficient scaffolds to adopt promising sorbents with fast kinetics is challenging, and very limited effort has been reported to address this critical issue. In this work, the availability and kinetic uptake of CO 2 in sorbents embedded in various matrices are studied. Three scaffolds including a commercially available industrial film containing ion-exchange resin (IER), IER particles embedded in dense electrospun fibers, and IER particles embedded in porous electrospun fibers are compared, in which a solvothermal polymer additive removal technique is used to create porosity in porous fibers. A frequency response technique is developed to measure the uptake capacity, sorbent availability, and kinetic uptake rate. The porous fiber has 90% IER availability, while the dense fibers have 50% particle accessibility. The sorption half time for both electrospun fiber samples is 10 AE 3 min. Our experimental results demonstrate that electrospinning polymer/sorbent composites is a promising technology to facilitate the handleability of sorbent particles and to improve the sorption kinetics, in which the IER embedded in porous electrospun fibers shows the highest cycle capacity with an uptake rate of 1.4 mol CO 2 per gramhour.

Sorbents for the Direct Capture of CO2 from Ambient Air

“…The authors report the new sorbent has a faster CO 2 sorption rate than other reported sorbents . Since then, Armstrong et al., Song et al., and Hou et al . each reported their own newly developed sorbent to have a shorter half‐time—i.e.…”

“…[262] Shi et al [88] developed anew moisture-swing CO 2 sorbent with an ion-exchange resin (IER) and ap olyvinyl chloride (PVC) as binder.T he authors report the new sorbent has af aster CO 2 sorption rate than other reported sorbents. [88] Since then, Armstrong et al, [263] Song et al, [264] and Hou et al [265] each reported their own newly developed sorbent to have ashorter half-time-i.e.the time it takes to reach half of the asymptotic loading. These half-times were measured under ambient conditions.The half-time provides an easy first assessment of the CO 2 absorption kinetics.T oprovide afair comparison of the half-times of different sorbents for CO 2 capture from ambient air, the half-time should be measured under ambient conditions (400 ppm CO 2 ).…”

A Review on the Secondary Surface Morphology of Electrospun Nanofibers: Formation Mechanisms, Characterizations, and Applications

“…Increasing the porosity and specific surface area of fibers can be accomplished with improving the performance of absorption, catalysis, sensors, and so on. Therefore, porous fibers have presented extensive use in a wide variety of applications …”

Sorbenten zur direkten Gewinnung von CO2 aus der Umgebungsluft

“…In der Studie wird behauptet, dass dieser neue Sorbent eine schnellere CO 2 ‐Sorptionsrate als andere Sorbenten aufweist, über die bis zu diesem Zeitpunkt berichtet wurde . Seitdem haben Armstrong et al., Song et al . und Hou et al .…”

“…Verfahrensprotokolle zum Aufpfropfen von Polymeren auf Ruß (oben), zur Herstellung von Matieralien mit kolloidalen Kristalltemplaten (Mitte) und zur Synthese von Materialien auf HIPE-Basis (unten). [257] Angewandte Chemie strong et al, [263] Song et al [264] und Hou et al [265] berichten, dass ihre eigenen, neu entwickelten Sorbenten eine kürzere Halbwertszeit -d.h.die Zeit, die bençtigt wird, um die Hälfte der asymptotischen Beladung zu erreichen -aufweisen. Diese Halbwertszeiten wurden bei Umgebungsbedingungen gemessen.…”