Removal of copper ions from aqueous solution by adsorption on ionic hybrids based on chitosan and clinoptilolite

Ionic hybrids based on chitosan and clinoptilolite with sorption capacity for copper(II) ions higher than that of cross-linked chitosan are presented in the paper. Hybrids based on chitosan and clinoptilolite were characterized by swelling degree in water as a function of pH, and by the sorption and desorption of copper(II).