Low-Temperature Adsorption Study of Carbon Dioxide on Porous Magnetite Nanospheres Iron Oxide

Abstract

Porous magnetite Fe3O4 nano-spheres (PMNs) have been successfully produced and have been demonstrated to be high-efficiency adsorbents. The PMNs have a spherical shape with an average particle size of 25.84 nm. The BET surface area of PMNs is 143.65 m2g-1, with a total pore volume of 0.16 cm3g-1. As a result of CO2 adsorption and desorption features on dry PMNs, this synthesized material is projected to be exploited as possible CO2 sequestration reservoirs to minimize greenhouse gas emissions. CO2 adsorption was best at low temperatures and with dry PMNs. PMNs, on the other hand, has a very high adsorption capacity of 0.96 mmol/g. According to the IUPAC categorization of adsorption isotherms, all CO2 adsorption isotherms of coal samples fall into type I, which most likely indicates adsorption restricted to a few layers of molecules (micropores and mesopores). Langmuir, Henry, Dubbin, Temkin, Toth, Harkin-Jura, Elovich, Redlich Peterson, and Josene models suit any experimental adsorption data that best predict the heterogeneous surface features of PMNs.