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Abstract
The features of sorption of Cu2+ ions from aqueous solutions of CuSO4 by granulated chitosan sorbent in static conditions and the different contribution of surface and bulk amino groups in the sorbent to complexation are discussed. Sorption with freshly formed swollen and maximally amorphized granules with accessible bulk amino groups can be described by Langmuir’s equation; it attains 5.6 mmole/g of dry sorbent, which is close to the sorption calculated from the equimolar composition of the amino-copper complex. Sorption of initially dry granules with less accessible bulk amino groups does not obey Langmuir’s equation due to precipitation of copper hydroxide and hydrosulfate on the surface of the sorbent.
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