CO ₂ adsorption behaviors of activated carbons modified by chelating groups

In this work, the adsorption behaviors of activated carbons (ACs) containing chelating functional groups were studied in CO ₂ removal. The ACs were modified by pyrolysis of peroxide and glycidyl methacrylate graft polymerization in order to induce chelating functional groups, such as diethylenetriamine groups on the AC surfaces. The surface functional groups of the ACs were characterized by scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). The textural properties of the ACs were analyzed by N ₂/77 K isotherms. Adsorption behaviors of the ACs were observed in the amounts of CO ₂ adsorption. From the results, we found that the chelating functional groups on the AC surfaces led to enhance selectivity and chemisorption on CO ₂ adsorption in spite of decreasing the physical adsorption properties.