Sorption of copper (II) cations from aqueous media by a cellulose-containing sorbent
Abstract
The process of distribution of copper ions in the "aqueous CuSO4 solution/cellulose-containing sorbent" system is studied. The sorption isotherms for Cu2+ ions obtained within the temperature range of 296–363 K indicate the exothermic behavior of the process. The experimental data on sorption of Cu2+ ions are treated within the Langmuir model and the theory of volume filling of micropores. Both models allow us to describe well the process of sorption. The value of maximum sorption of copper ions determined from the Langmuir model is in better agreement with the experimental data. During sorption of Cu2+ ions, the cellulose sorbent was found to behave as a weak-acid cation exchanger, in which the sorption sites are represented by -COOH groups in the H+ or salt forms.
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