Selective uptake and recovery of cadmium (II) by microcapsule containing chelating resin

摘要

A chelate resin that adsorbed 2-(p-sulphophenylazo)-l,8-dihydroxy-3,6-naphthalene disulfonate ion on an anion exchange resin was synthesized,and then polystyrene microcapsules containing the chelate resin were prepared by interfacial polymerization with W/O/W emulsions.The uptake to Cd~(2+),Co~(2+),Ni~(2+),Zn~(2+),Cu~(2+) and Zr~(4+) ions into the microcapsules was studied at 25degC.The adsorption rate of Cd~(2+) ion to the microcapsules was about four times more than that of Zn~(2+),Co~(2+),Ni~(2+) and Cu~(2+) ions.None of the metallic complexes trapped to the microcapsules were affected by the outside environment like pH (1-7),and the Cd~(2+) ions remained unaffected in the microcapsules even in 1 M HC1 solution.