Sorption extraction of metal ions by materials based on sulfoethylated poly(allylamine) under dynamic conditions
Abstract
The study is devoted to the investigation of the sorption of a number of metal ions (cooper (II), nickel (II), cobalt (II), zinc (II), cadmium (II), calcium (II), magnesium (II), strontium (II), barium (II), silver (I)) under dynamic conditions with sorbents based on sulphoethylated poly(allylamine) cross linked with epichlorohydrin with various degrees of modification (DM) by sulphoethyl groups, 0.5 and 1.0 (SEPAA 0.5 and SEPAA 1.0, respectively). The experiment was carried out by passing the test solution through a cartridge containing the test sorbent with a certain DM. The content of metal ions in the initial solution and portions of the solution leaving the cartridge was monitored by inductively coupled plasma atomic emission spectroscopy. As a result, dynamic output curves of copper (II) and silver (I) ions from binary and multicomponent (in the presence of a number of transition and alkaline earth metal ions) solutions were obtained during their sorption with SEPAA 0.5 and SEPAA 1.0. The values of the dynamic capacity of sorbents, as well as the selectivity coefficients of silver (I) with respect to accompanying metal ions, were calculated. It was established that SEPAA 0.5 allows the selective and quantitative extraction of silver (I) from multicomponent solutions. In this case, pH 6.0 corresponds to the maximum selectivity concentration, and pH 5.0 corresponds to the maximum sorption. The sorbent with a degree of modification of 1.0 under dynamic conditions was characterised by relatively low capacity values for all studied metal ions. A regularity for a decrease in the selectivity of sorption and the amount of sorbed silver (I) with an increase in the degree of modification of poly(allylamine) with sulphoethyl groups was revealed, despite the fact that we previously obtained the opposite result for static conditions. Based on the data obtained, an assumption about the predominance of the ion-exchange interaction mechanism of metal ions with the functional groups of the sorbent during their extraction with a material with a maximum DM - SEPAA 1.0 was made. Elution curves of silver (I) and copper (II) from the surface of sorbents were obtained, it was shown that quantitative desorption was achieved using 50.0 cm3 1 mol/dm3 nitric acid solution.
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