Metal Ion Selectivity of Bifunctional Cation Exchange Resins Containing Phosphonate and Sulfonate Derived from Crosslinked Chloromethylstyrene-styrene Copolymers

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Three phosphonate/sulfonate bifunctional resins having different molar ratios of both functional groups were prepared from three kinds of chloromethylstyrene-styrene-divinylbenzene copolymers which were prepared by suspension polymerization of three different molar mixtures of chloromethylstyrene and styrene in the presence of 10 mol % divinylbenzene as crosslinker. Selectivity sequences of these resins toward Ba (II), Cu (II) and Pb (II) were evaluated by measuring their distribution ratios as a function of equilibrium pH of aqueous phases and columnar competitive adsorption of these metal ions as well. It was revealed that the metal ion selectivity sequence of these bifunctional resins was governed by both functional groups and their molar ratios strongly affect the metal ion selectivity sequence; the selectivity sequence of the bifunctional resins approaches that of the monofunctional sulfonate resin with an increase in molar ratio of sulfonate/phosphonate and does that of the monofunctional phosphonate resin with a decrease in molar ratio of sulfonate/phosphonate. These results indicate that the concept of bifunctionality is useful for design of a resin with a novel metal ion selectivity sequence.
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