Design of an Intelligent Nanofiber-Based Solid Amine Adsorbent with High CO₂ Capture Capacity and an Ultralow Regeneration Temperature

Abstract

Solid amine adsorbents cannot typically maintain desirable CO2 capture capacity while having ultralow regeneration temperatures. To address this issue, a novel thermoresponsive nanofiber-based solid amine adsorbent (TRCNF/PEIA) with high amino density and high content of thermoresponsive intelligent groups was designed and prepared using epichlorohydrin to rapidly cross-link polyethyleneimine (PEI) and a thermoresponsive cellulose nanofiber (TRCNF). The latter was obtained by grafting N-isopropylacrylamide (NIPAm) on the cellulose nanofiber (CNF) through Ce (IV)-initiated free radical polymerization. The as-prepared TRCNF/PEIA simultaneously showed high capture capacity (6.74 mmol/g) with water at 25 °C and a low regeneration temperature (60 °C). A comparison of the adsorption–desorption properties of TRCNF/PEIA with those of the PEIA, which was prepared using a procedure similar to that of TRCNF/PEIA but without TRCNF, showed that the thermoresponsive property of PNIPAm and the synergy of the hydroxyl groups of TRCNF/PEIA could facilitate CO2 complete desorption from the adsorbent at 60 °C, which was the lowest regeneration temperature to maintain the high adsorption capacity (≥6 mmol/g) of the adsorbents, based on the literature reports.

Tailoring of an ultralow temperature adaptive cellulose nanofiber-based flexible zinc-air battery with long cycle life

“…2c). 42 The peak at 1344 cm −1 shown an enhanced trend and the peak at 1295 cm −1 shown a decreasing trend with the increase of LiCl content. This phenomenon was caused by the more combination of H and Cl − .…”

“…3a and b 3b). 42 In addition, the nanoscale CNF could be presented in its SEM and TEM images (Fig. 3d, e, and f), indicating that the as-prepared CNF was rich in hydroxyl and This journal is © The Royal Society of Chemistry 2022 carboxyl groups.…”

Advanced Indoor CO2 Capture Technologies: A Comprehensive Review and Future Perspectives

“…Solid adsorbents are a promising alternative to overcome these restrictions because of their non-corrosive nature and low regeneration energy consumption (Lin et al 2023, Lin et al 2021.…”

Direct-Air-Capture Technique of Cellulose for Mineralizing Pb2+ from Wastewater: Synchronous Accomplishment of CO2 Capture and Water Treatment

“…29,30 Despite the fact that cellulose could form carbonates with CO 2 during the pulp-making process, 31−34 it has been a prevalent DAC material. 35−37 According to reports, 38,39 (due to a weak binding affinity), cellulose combines with a superbase such as NaOH or amine to improve its performance. Even though a superbase helps cellulose to attain DAC to some extent, adsorbed CO 2 appears in the form of soluble carbonates.…”

“…As the most abundant natural carbohydrate resource on earth, cellulose offers the advantages of low cost and easy availability, which makes it a suitable alternative for fossil materials. , Despite the fact that cellulose could form carbonates with CO 2 during the pulp-making process, − it has been a prevalent DAC material. − According to reports, , instead of CO 2 (due to a weak binding affinity), cellulose combines with a superbase such as NaOH or amine to improve its performance. Even though a superbase helps cellulose to attain DAC to some extent, adsorbed CO 2 appears in the form of soluble carbonates.…”