Synthesis of novel mixed matrix scaffolds and adsorption of copper ions of waste water

Abstract

Mixed matrix scaffolds were synthesized by uniformly distribution of ion exchange resins (H+ form Amberjet, ID 780 mm) into the stereo-structural chitosan matrix and then used for the removal of copper ions from waste water. Specifically, Amberjet particles suspended in a 1 wt% of viscous chitosan solution were filled with cylindrical aluminum containers to prepare chitosan mixed matrix scaffolds through the freeze-gelation process. The internal surface area of mixed matrix scaffolds is 78 m2/g. The adsorption processes were performed by chelate copper ions of waste water onto the amine functional groups (-NH2) exposure on the external and porous stereo-structural surfaces of chitosan matrix as well as the sulfonate functional groups on the outer surface of ion exchange resins, respectively. Results of a low initial copper ion concentration of 5 mg Cu2+/L were used to study the adsorption capacities as well as adsorption kinetics experi-mentally. The kinetic experimental data correlated well with the second order adsorption model, suggesting that the rate limiting step of mixed matrix scaffolds may be the chemical adsorption. ? 2010 Desalination Publications.