화학공학소재연구정보센터
Industrial & Engineering Chemistry Research, Vol.50, No.17, 10270-10277, 2011
Preparation of Novel Emulsion Gel Adsorbents and Their Adsorption Properties for Heavy-Metal Ions
Novel emulsion gel adsorbents were developed for metal adsorption. Poly[poly(ethylene glycol) methyl ether acrylate] [poly(PEGMEA)] was used as a nonionic hydrophilic polymer, and 2-ethylhexylphosphoric acid mono-2-ethylhexyl ether (EHPNA) was used as an organophosphorus extractant for rare metal ions. Poly(PEGMEA) hydrogel containing randomly distributed oil microdroplets of EHPNA were prepared by the emulsion gelation method using oil-in-water emulsions under various monomer concentrations, oil volume fractions, and surfactant concentrations. The emulsion gel successfully adsorbed In(III) ions used as a representative metal. Mutual separation of In(III) and Zn(H) ions and repeated adsorption were successful because of the pH dependence of the metal extractant complexation. The emulsion gel has a higher degree of compressive deformation and abrasion resistance than a conventional (nonemulsion) hydrogel and shows potential for use in practical separations.