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Series of heterogenized copper complexes are prepared by either coprecipitation or adsorption of Cu(II) on the bulk chitosan and composite supports (egg-shell type chitosan/SiO 2 and chitosan/MCM-41systems). The morphology and properties of the catalysts are studied by FTIR, UV-Vis, SEM, and ESR methods, and the activity of the redox sites immobilized by the chitosan matrix is tested in oxidation...