Abstract
The effect of pH of the medium on the process of distribution of Co(II), Cu(II), and Ni(II) ions in a heterophase system of H2O-HCl-MCl2-wood cellulose is studied. The specifics of the mechanism of metal cation protodesorption are explained by the experimental linear correlation dependence of the distribution coefficient of metal cations on the acidity of the medium in the logarithmic scale, logKD = f(pH), with tanα ≈ 1/4, which is inconsistent with the classical mechanism of simple ion exchange of M2+ to 2H+. The underrating of the exponent corresponding to proton participation in desorption of the metal cation is due to participation of their carrier-anions in the interphase exchange in the form of MCl2 and 2HCl, which allows the mechanism of metal cation protodesorption to be interpreted in the terms of the general equation of inter-phase ion exchange in the molecular form.
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