Adsorption of CO_2 on composities of anion exchange resins and chitosan

摘要

A new method is proposed to improve the adsorption properties of basic, macroreticular (MR) anion exchange resins by forming a material composite with chitosan. In this study, one strongly basic and one weakly basic MR resin were used as matrixes for the new composites. Chitosan was accumulated in the macropores of the resins, and breakthrough curves for adsorption of CO_2 on the new adsorbents were measured. The resulting equilibrium and kinetic data were compared with those of the original resins. The composite of strong basic MR resin and chitosan showed a more than 2 times higher adsorption capacity for CO_2 than that of the pure resin. In the same time, the mass transport in the adsorbent slowed down due to a narrowing of the pores by deposited chitosan. In the case of the weak basic MR resin, it seems the accumulated chitosan blocked pores on the surface of the microparticles, resulting in a lower uptake of CO_2 in comparison with the original resin.