Divinylbenzene-crosslinked terpolymer consisting of hemin, styrene, and 2-methyl-5-vinylpyridine as cyanide ion exchanger. Preparation of the polymer in the form of beads by suspension polymerization

Bead-shaped, divinylbenzene-cross-linked terpolymers, consisting of hemin (ferri-protoporphyrin IX chloride), styrene, and 2-methyl-5-vinylpyridine, were prepared by suspension polymerization in which all or part of styrene monomer was replaced with divinylbenzene. Analogous terpolymers of the cross-linked and uncross-linked formless types were also prepared by solution polymerization. All the terpolymers obtained were characterized by electron spin resonanance spectroscopy, scanning electron microscopy, and measurement of specific surface area. The characteristic of the adsorption of cyanide ion onto the terpolymer beads was investigated and compared with those adsorbed onto their analogs. The column separation of cyanide ion with the terpolymer beads was carried out to examine the ion-adsorbing capacity. It was found that the suspension polymerization is just appropriate to prepare a cyanide ion exchanger in the form of beads.