Derivation of adsorption parameters for nanofiltration membranes using a 1-pK Basic Stern model

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Lint de, W.B. Samuel and Benes, Nieck E. and Higler, Arnoud P. and Verweij, Henk (2002) Derivation of adsorption parameters for nanofiltration membranes using a 1-pK Basic Stern model. Desalination, 145 (1-3). pp. 87-95. ISSN 0011-9164

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Abstract:The ion retention and flux of nanofiltration (NF) membranes are to a large extent determined by the membrane surface charge. This surface charge is in turn strongly influenced by adsorption of ions from the solution onto the membrane material. A 1-pK adsorption model with a Basic Stern electrostatic double layer model is used to describe ion adsorption, and the sensitivity of this model for various parameters is discussed. From a non-linear regression analysis of literature data [1,2] regarding the surface charge and the zeta-potential, adsorption parameters for the 1 pK model are obtained for sodium chloride on γ-alumina. The 1-pK Basic Stern model could predict the surface charge well, except for the highest concentration of 1000 mol/m3. Reasonable agreement is found between the measured zeta-potentials and the model predictions.
Item Type:Article
Copyright:Elsevier Science
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/72242
Official URL:http://dx.doi.org/10.1016/S0011-9164(02)00391-0
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Metis ID: 209118