Abstract <p>Composite sorbents based on chitosan and containing silica and topinambur, as well as carbon nanotubes, have been developed for extracting heavy metal ions from aqueous solutions. The equilibrium and kinetics of copper(II) ion extraction in the “aqueous solution of metal sulfate–sorbent” heterophase system were studied for the initial chitosan powder and for the modified sorbents obtained in the form of hydrogel granules. In a kinetic experiment, the time required to reach the sorption equilibrium was determined, and a kinetic model was established that describes the process most accurately. The experimental sorption isotherms indicate a significant increase in the sorption capacity of the chitosan-based composites compared to that of the original sample. As a result of processing the sorption isotherms of copper(II) ions according to the Langmuir model, the maximum sorption capacities of the sorbents (<i>A</i>_∞) were determined. It was established that <i>A</i>_∞ of the chitosan/silica/topinambur and chitosan/carbon nanotubes composite sorbents significantly exceed <i>A</i>_∞ for the original chitosan. The changes in the composition of the sorbents as a result of modification compared to the starting chitosan are confirmed by IR spectral data. The SEM studies showed the presence of a developed surface structure of the granules of chitosan-based composite sorbents.</p>