Abstract:

The diazonium salts of cross-linked polystyrene were prepared by nitration, reduction and diazotization of macrorecticular styrene-divinyl-benzene copolymers. The diazonium salts were coupled with hydroxy aryl derivatives and amino phenyl derivative, e. g. salicylic acid, p-hydroxybenzoic acid, 2, 4-dihydroxybenzoic acid, gallic acid, 2-hydroxy-3-naphthoic acid, sulfosali-cylic acid, 4-hydroxynaphthalene sulfonic acid, p-aminobenzene sulfonic acid, and with salicylaldehyde, respectively. Thus, a series of new cation exchange resins were prepared. The influence of pH value of the reaction medium and of different structures of the hydroxy aryl derivatives on the coupling reaction were investigated. The new resins have excellent selectivity for the copper, iron ions etc. and show also good adsorption-elution properties for some vitamines and antibiotics.