title: Fast and reversible direct CO2 capture from air onto all-polymer nanofibrillated cellulose-polyethylenimine foams.
abstract: Fully polymeric and biobased CO2 sorbents composed of oxidized nanofibrillated cellulose (NFC) and a high molar mass polyethylenimine (PEI) have been prepared via a freeze-drying process. This resulted in NFC/PEI foams displaying a sheet structure with porosity above 97% and specific surface area in the range 2.7-8.3 m(2)·g(-1). Systematic studies on the impact of both PEI content and relative humidity on the CO2 capture capacity of the amine functionalized sorbents have been conducted under atmospheric conditions (moist air with ∼400 ppm of CO2). At 80% RH and an optimum PEI content of 44 wt %, a CO2 capacity of 2.22 mmol·g(-1), a stability over five cycles, and an exceptionally low adsorption half time of 10.6 min were achieved. In the 20-80% RH range studied, the increase in relative humidity increased CO2 capacity of NFC/PEI foams at the expense of a high H2O uptake in the range 3.8-28 mmol·g(-1).
authors: Empa, Swiss Federal Laboratories for Materials Science and Technology, Applied Wood Materials Laboratory. Überlandstrasse 129, CH-8600, Dübendorf, Switzerland.
authors: Houssine
authors: H
authors: Sehaqui
authors: María Elena
authors: ME
authors: Gálvez
authors: Viola
authors: V
authors: Becatinni
authors: Yi
authors: Y
authors: cheng Ng
authors: Aldo
authors: A
authors: Steinfeld
authors: Tanja
authors: T
authors: Zimmermann
authors: Philippe
authors: P
authors: Tingaut
mesh_terms: D000327:Adsorption; D000397:Air Pollution / Q000517:prevention & control*; D002245:Carbon Dioxide / Q000737:chemistry*; D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D005612:Freeze Drying / Q000379:methods; D006813:Humidity; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D011094:Polyethyleneimine / Q000031:analogs & derivatives* / Q000737:chemistry; D016062:Porosity; D013997:Time Factors
chemical_list: C018367:polyethyleneimine-cellulose; D002245:Carbon Dioxide; D011094:Polyethyleneimine; D002482:Cellulose