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E. Kociolek-Balawejder

A polymer containing the active iodine as oxidant for cyanides (in English)

Polimery 1999, No 10, 674

DOI: dx.doi.org/10.14314/polimery.1999.674


A redox copolymer, viz., a macroporous poly(S/DVB) resin carrying N-iodosulfonamide groups, S/DVB-S02NINa, was used to remove cyanide ions from aqueous solutions by oxidation to cyanates. Preparation of the copolymer is described [cf. 3, 5]. The resin groups contain active iodine, 1.40 mmol/g (2.80 meq/g), that exhibits strong oxidative properties. This redox resin was employed in a static system to oxidize cyanide to cyanate ions (reaction 1). Reactions were carried out in aqueous alkaline (from 0.01 to 1 M NaOH) 0.001—0.1 M KCN solutions containing 26—2600 mg CN-/dm3 (Table 1). The reactants were used in different mole ratios. Active iodine or cyanides were used in excess over the stoichiometry of reation (1). As an alternative to oxidation of cyanides by N-iodosulfonamide resin, the oxidation of these ions by N-chlorosulfonamide resin with addition of a catalytic amounts of iodides was examined too. Experiments were carried out in a batchwise mode and under conditions similar to those applied to the N-iodosulfonamide.

Keywords: oxidation of cyanides, active chloride, active iodine, redox polymers, macromolecular N-chlorosulfonamide, macromolecular N-iodosulfonamideperties

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