High performance CO2 Absorption/Desorption using Amine-Functionalized magnetic nanoparticles

Abstract

In the current study, for the first time, a variety of amino acid groups, including arginine, histidine, and glycine, were added to Fe3O4 nanoparticles to achieve desired mass and heat transfer properties in CO2 absorption/desorption experiments. For this purpose, different concentrations of synthesized nanoparticles were employed in base fluid (10 wt% methyldiethanolamine) in a semi batch experiment at ambient pressure for CO2 absorption and desorption. The experimental results clearly indicated that modification of iron oxide nanoparticles could enhance CO2 absorption and stripping significantly, as a result of higher stability of nanoparticles and presence of amino groups at the nanoparticles' structure. Compared to bare Fe3O4, Fe3O4@arginine, Fe3O4@histidine, and Fe3O4@glycine demonstrated 23%, 17%, and 10% increase in CO2 absorption capacity, respectively. By using chemical agent as stabilizer species and by modified thermal properties of solution, magnetic nanoparticles promoted CO2 desorption to a great extent. Therefore, Fe3O4@arginine, Fe3O4@histidine, and Fe3O4@glycine nanofluids improved CO2 desorption enhancement by 48.2%, 47.2%, and 46.1% at 70 °C, respectively.