Various type iron oxides of FeO,
Fe2O3, and
Fe3O4 were used for carbon dioxide (CO2) capture at room temperature and pressure by studying its adsorption–desorption
properties. Several interactions of carbonate species were detected
on its surface. The morphology of carbonate formation shows different
structures on FeO (grooves-like), Fe2O3 (fine
sharp particles), and Fe3O4 (aggregated nanoparticles).
CO2 chemisorption discovered a potential adsorbent of Fe2O3 with an adsorption capacity of 3.95 mgCO2/gadsorbent. The adsorption capacity increased up to 62.8%
by using concentrated 99.9% CO2 for adsorption. At higher
concentration of CO2 exposure, it partially turns to red
color which indicated the less stable Fe3O4 was
easily oxidized to Fe2O3 after CO2 regeneration with temperatures up to 500 °C. Hence, Fe2O3 possessed the highest basicity strength (1.26
cm3/g), and the adsorption capacity after four cycles was
not significantly reduced by 8.6% indicating an effective chemical
or physical adsorption in CO2 capture.
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