A permittivity study for PVA membranes, obtained by freeze-thaw technique

Patachia, Silvia and Papancea, Adina (2006) A permittivity study for PVA membranes, obtained by freeze-thaw technique. Pollack Periodica, 1 (1). pp. 105-113. ISSN 1788-1994

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Abstract

Late diffusion or selective diffusion through polymeric membranes has various applications in separation processes, environmental protection, pharmaceutics for drug delivery systems, etc. The aim of this work is to present the results of some ions diffusion through poly(vinyl alcohol) [PVA] hydrogel membranes, obtained by freeze-thaw technique. The diffusion of potentially toxic ions -Pb(II)- and of alkaline ions like Na⁺ and K⁺ is tested using conductometry, flame photometry and atomic absorption spectrometry. The membrane permitivitty is calculated for every ionic species and the opportunity is studied to use these membranes in environmental protection, for waste water purification. The modifications of the PVA structure have been made by mixing the PVA solution with some natural products (beta-cyclodextrine or chitosan) or by compounding PVA hydrogel with Cu²⁺.

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