Synthesis of different modified magnetic nanoparticles for selective physical/chemical absorption of CO2 in a bubble column reactor

In this examination, Fe3O4 nanoparticles were employed as a base of this work to investigate the carbon dioxide (CO2) capture because of various advantages compared to other nanoparticles. First, the stability of Fe3O4 nanoparticles was enhanced using some hydrophilic agents, to supply more nanoparticles loading in the base fluid (distilled water). Then, the CO2 absorption capacity of nanoparticles was raised with different CO2 chemical absorbents. Accordingly, Fe3O4-aminopropyl (Fe3O4-AP), Fe3O4-lysine, Fe3O4@SiO2-aminopropyl (Fe3O4@SiO2-AP), and Fe3O4@SiO2-lysine nanoparticles were used to improve the absorption capacity of Fe3O4 nanoparticles in CO2 absorption. The influences of nanoparticle loading, nanoparticle stability, and chemical CO2 absorbent type were considered. Experimental results proved that all modified Fe3O4 nanoparticles were markedly more effective than Fe3O4 nanoparticle in CO2 capture, and under the best CO2 absorption condition, the Fe3O4@SiO2-lysine nanoparticles led to enhance CO2 capture up to 88 and 59 % as compared to base solvent and Fe3O4 nanofluid, respectively. The removal efficiency of Fe3O4, Fe3O4-AP, Fe3O4-lysine, Fe3O4@SiO2-AP, and Fe3O4@ SiO2-lysine nanoparticles at optimum concentrations were about 18.12, 39.61, 55.20, 78.00 and 88.00 %, respectively. Moreover, based on observations, Fe3O4@SiO2-AP and Fe3O4@SiO2-lysine nanoparticles did not need ultrasonic waves to disperse in base solvent, and they dispersed in the solvent just by a mechanical stirrer.