Transfer of counterions and diffusion of electrolyte in inorganic membranes modified by ion exchanger nanoparticles

Using the method of impedance spectroscopy we have investigated charge selectivity of macroporous inorganic membranes modified with nanoparticles of the inorganic ion exchanger—hydrated zirconium dioxide, which displays anion-exchange properties in an acid area. It has been found that transfer numbers of the SO₄ ^2? reach 0.81–0.9 at the H₂SO₄ concentration 10 mol · m^?3 and decrease as the acid concentration in solution goes down. It has also been found that modified membranes demonstrate a two-fold decrease of the diffusion coefficient of H₂SO₄ compared with a free solution. It has been shown that charge selectivity of the membrane improves as the amount of the ion exchanger in the matrix increases.