SORPTION ABILITY OF SAMPLES OF HUMIC ACIDS AND THEIR SODIUM SALTS WITH RESPECT TO Cd2+ IONS

Abstract

The paper presents an analysis of the sorption properties of humic acids and their sodium salts isolated from high-moor peat of the Arkhangelsk region with respect to Cd2+ ions at various pH values. Using adsorption isotherms, the volumetric capacity of the studied preparations was calculated. Langmuir and Freindlich mathematical models were used to quantify the sorption capacity of preparations. Calculation of mathematical models of Langmuir and Freindlich sorption, as well as statistical data processing was carried out using Microsoft Office for Windows, Excel, 2016 software. their sodium salts. An estimate of the rate of binding of cadmium ions by various sorbents is given, and the pH at which the sorption capacity of humic acids and their sodium salts is maximum is determined. The structural and functional features of humic acids are presented, proving their high binding capacity and strength of Cd2+ binding, as well as relatively high selectivity. Based on the results obtained, it is assumed that it is possible to develop and use preparations based on humic acids as sorbents.