Effect of the State of Carboxyl Groups of Pectin on the Sorption Binding of Copper Ions

Abstract

Abstract The relationship between the molecular structure characteristics of pectin and the sorption equilibrium with a copper solution was evaluated. The chemisorption processes were described using the model of the theory of micropore volume filling. For pectin samples subjected to a cycle of transformations for changing the chemical state of carboxyl groups in the polymer, the decrease in their activity in passing from the unsubstituted state to the calcium-pectate and methoxylated forms was studied. The contribution of the parameters of the chemical structure of pectins to their total copper adsorption capacity was differentiated. The composition–property models were obtained, which allow one to predict and selectively change the level of the metal-binding capacity of pectin-containing sorbents.