STUDY OF METAL SORPTION BY COVALENTLY IMMOBILIZED POLYAMPHOLYTES BASED ON AMINO ACIDS

Abstract

In the presented article, the sorption properties were studied for the first time of polyampholyte, obtained by polycondensation - covalent fixation of ortho-aminobenzoic acid on a matrix of epoxy resin "epoxymol" and polyethylene polyamine. In particular, this polymer was complexed with copper, nickel, zinc, cobalt, and silver ions. The structure of both the resulting polyampholyte itself and its metal complexes with the indicated metals (d-elements) was determined by IR spectroscopy. For the first time, the IR spectra of ligand-polyampholyte complexes with copper, nickel, zinc, cobalt, and silver ions were recorded and studied. These spectra are compared with the spectra of the polyampholyte itself. Scanning electron microscopy (SEM) (photography, elemental analysis) was used to study the microscopic structure of the O-ABA:ED-20:PEPA ligand (ortho-aminobenzoic acid, epoxy resin, polyethylenepolyamine) and its coordination compound with copper ions Cu2+. According to the results of elemental analysis, the gross formulas of the obtained polyampholyte coordination compounds with all coordinated (adsorbed) metals are given. According to the experimental data, obtained as a result of studying the thermal stability of polyampholyte, it was shown that the sorbent is stable up to a temperature of 200 °C. The resulting sorbent is recommended for practical use in the sorption of some d-metal ions from solutions. The dependence of the sorption of some d-metals on the pH of the medium was also studied, and were constructed graphs that describe the dependence of the sorption of metals on pH in the synthesized complexing ligand, showing that the sorption of ions is higher in slightly acidic media.