Sorption of aromatic acids from aqueous solutions by polymer based on N-vinylpyrrolidone

Abstract

Kinetic and equilibrium characteristics of the sorption of benzoic, salicylic and ortho-chlorobenzoic acids by a new cross-linked sorbent based on N-vinylpyrrolidone were studied at various pH values of the medium. It was found that the molecular sorption of aromatic carboxylic acids from aqueous solutions occurs in the mixed-diffusion mode and the sorption capacity of the polymer grows with increasing acid-base equilibrium constants of the acids. The advisability of introducing a salting-out agent into sorption systems was confirmed. Effective sorption systems and a method for concentration of aromatic carboxylic acids from aqueous solutions by the new cross-linked sorbent based on N-vinylpyrrolidone were suggested.