Abstract
The selective and electrokinetic properties of an OPMN-KMZ nanofiltration membrane with a selective layer of piperazine and trimesoyl chloride copolymer with respect to aqueous solutions of barium, yttrium, and thorium nitrates are investigated in a wide range of their concentrations. It is disclosed that, after the charge reversal of the initially negatively charged surface of this membrane by thorium cations, the rejection coefficients of the chlorides of alkali metals, ammonium and magnesium become much larger. After the desorption of thorium cations from the pore surface, the membrane retains its selectivity which is characteristic of the modified state. The dependence of the rejection coefficient of the solutions of salts with single-charged ions on the adsorption potential of constituent cations is established. An assumption of the existence of the “conformation–energy memory” of a membrane surface with respect to thorium cations is made.
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