Role of the Structure of Graphene Oxide Sheets on the CO2 Adsorption Properties of Nanocomposites Based on Graphene Oxide and Polyaniline or Fe3O4-Nanoparticles

摘要

New nanocomposites based on graphene oxide with polyaniline (PANI) or Fe_(3)O_(4) nanoparticles (MG) were synthesized for CO_(2) capture. To study the effect of graphene oxide structure on the CO_(2) retention capacity, CO_(2)/N_(2) selectivity, adsorbent regeneration, and adsorption kinetics, two different graphene oxides were synthesized by oxidation of graphite flakes (GO) and commercial carbon nanofibers (NSGO). CO_(2) adsorption isotherms at 300 K were evaluated by gravimetric experiments. The results described the CO_(2) adsorption as reversible physisorption mechanism, where the CO_(2) adsorption capacity increases linearly with the micropore volume. Results also demonstrate the good CO_(2)/N_(2) selectivity, recyclability, and fast adsorption kinetics of the materials tested. Differences concerning the adsorption properties of nanocomposites are related to the chemical composition and the size of graphene oxide sheets.