Journal
DESALINATION
Volume 147, Issue 1-3, Pages 213-216Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0011-9164(02)00536-2
Keywords
titania; nanofiltration; adsorption; cation; permeation resistance
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Titania (TiO2) membranes with molecular weight cut-offs controlled at 250, 400, and 2000 were successfully prepared by the sol-gel process. These porous membranes rejected electrolytes based on Donnan exclusion, and the permeate volume flux, based on the electroviscous effect, was pH-dependent, similar to polymeric porous membranes. Moreover, divalent counterions (Ca2+,Mg2+) which were strongly adsorbed by ion-exchange at alkali pH, drastically reduced volume flux, compared with monovalent cations (Ne (+), K+); this tendency was pronounced for porous membranes with smaller pore sizes. The evidence for hydrodynamic resistance by the adsorbed divalent cations was shown based on permeation and zeta potential measurements of mixtures.
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