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

W.B.S. de Lint, Nieck Edwin Benes, A.P. Higler, H. Verweij

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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.
Original languageUndefined
Pages (from-to)87-95
Issue number1-3
Publication statusPublished - 2002


  • IR-72242
  • METIS-209118

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