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

• Published in: Journal of water chemistry and technology Vol. 32; no. 3; pp. 145 - 153
• Main Authors: Dzyaz’ko, Yu. S., Vasilyuk, S. V., Stefanyak, N. V.
• Format: Journal Article
• Language: English
• Published: Heidelberg Allerton Press, Inc 01.06.2010; Springer Nature B.V
• Subjects: Aquatic Pollution; Earth and Environmental Science; Electrolytes; Environment; Industrial Chemistry/Chemical Engineering; Ion exchange; Membranes; Nanoparticles; Physical Chemistry of Water Treatment Processes; Waste Water Technology; Water Industry/Water Technologies; Water Management; Water Pollution Control; Water Quality/Water Pollution; hydrated zirconium dioxide; membrane; nanoparticles; membrane electrolysis; charge selectivity
• ISSN: 1063-455X; 1934-936X
• DOI: 10.3103/S1063455X10030033

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 SO 4 2− reach 0.81–0.9 at the H 2 SO 4 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 H 2 SO 4 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.