In recent years, composite materials including organic–inorganic systems have drawn special attention due to their enhanced properties such as adsorbents and heterogeneous catalysts. At the same time, large-scale production of environmentally benign functionalized biopolymers, such as chitosan (CS), allows for constantly developing new materials, since CS reveals remarkable properties as a stabilizing agent for metal-containing compounds and enzymes and as an adsorbent of organic molecules. This review is focused on CS-based materials and on the composite systems including CS–oxide and CS–metal composites in particular for application as adsorbents and supports for catalytically active metal nanoparticles and enzymes.
Представлены результаты исследования адсорбционных свойств сшитых эпихлоргидрином хитозановых сфер. В ходе исследования была разработана методика получения и сшивки хитозановых сфер, а также магнитно-разделяемых композитов на их основе. Адсорбционная способность сшитых хитозановых сфер была исследована на примере водных растворов NiCl2 и K2Cr2O7 при варьировании концентрации ионов Ni2+ и Cr2О7 2- . Было показано, что адсорбционное равновесие в случае растворов хлорида никеля достигалось за 60 мин, тогда как в случае растворов бихромата калия требовалось более продолжительное время (420 мин и более).
The paper presents the results of a study of the adsorption properties of epichlorohydrin-cross-linked chitosan spheres. During the study, a procedure was developed for obtaining and cross-linking of chitosan spheres, as well as chitosan-based magnetically separable composites. The adsorption capacity of cross-linked chitosan spheres was tested by the example of aqueous solutions of Ni2+ and Cr2O7 2- with different concentrations. It was shown that the adsorption equilibrium in the case of Ni2+ was achieved in 60 min, whereas in the case of Cr2O7 2- a longer time was required (420 min or more).
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