Chelating Resins Containing Formazane Derivatives as Functional Groups and Their Sorption of Metal Ions

Abstract

Chelating resins have been prepared by introducing formazane derivatives with acid groups (X) to polyacrolein (X=COOH, OH, AsO₃H₂etc.). For the resins, the distribution coefficients (K_d) of metal ions and their pH dependency, and exchange capacity have bee examined. The resins show high selectivity to Cd²⁺, Zn²⁺ and Cu²⁺, log K_d being 4.20-5.54 for Cd²⁺, 4.03-4.70 for Cu²⁺ and 3.57-4.50 for Zn²⁺. The exchange capacities (meq/g) are 1.63-2.42 for Cu²⁺, 1.70-2.41 for Cd²⁺ and 1.73-2.41 for Zn²⁺.