for Recovering Transition Metal Ions

Abstract—A method was developed for preparing a chelating amino polymer, pyridylethylpolyethylenimine with maximal degree of substitution, by polymer-analogous transformations of branched polyethylenimine in reaction with 2-vinylpyridine. The ability of cross-linked pyridylethylpolyethylenimine with the degree of substitution of 0.32 to sorb Cu2+, Ni2+, Co2+, Zn2+, Cd2+, Mn2+, and Pb2+ ions present simultaneously in solution was evaluated. In an ammonium acetate sorption system (pH 3.5–4.0), the sorbent selectively interacts with Cu(II) ions. DOI: 10.1134/S1070427213090114 Polymer-analogous transformations of macromo-lecular compounds allow the application fi elds of known and available polymeric materials to be considerably expanded. Polyethylenimine (PEI) is a commercially available and highly reactive polymeric matrix. The PEI reactivity is determined by its polybase properties caused by the presence of primary, secondary, and tertiary amino groups. In most cases, their ratio is 1: 2: 1 [1], but it strongly depends on the polymerization conditions