Electrokinetic characterization of composite membranes: estimation of different electrical contributions in pressure induced potential measured across reverse osmosis membranes
✍ Scribed by J. Benavente; G. Jonsson
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 129 KB
- Volume
- 172
- Category
- Article
- ISSN
- 0376-7388
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✦ Synopsis
Pressure induced electrical potential across a composite polyamide/polysulfone reverse osmosis membrane and a microporous polysulfone membrane similar to the porous layer of the composite one ( E and φ PS st , respectively) were measured with NaCl and MgCl 2 solutions at different feed concentrations. Because of the high salt rejection and the two-layered structure assumed for reverse osmosis membranes, E values do not represent the streaming potential in the active layer since other electrical potentials (diffusion potential in the active layer, streaming potential in the porous sub-layer and boundary potential) are also included. These different terms were evaluated and the streaming potential for the active and porous layers of the composite membrane, φ a st and φ