Indian Journal of Advances in Chemical Science Volume: 6, Issue 4: , December 2018

ISSN No.: 2320-0898 (Print); 2320-0928 (Electronic)

DOI: 10.22607/IJACS.2018.604001

Research Article

Performance of Nanofiltration Membranes on Water Demineralization Assessment and Comparative Study

Sufyan Fadhil*

ABSTRACT

Ions transport in nanofiltration (NF) membranes was investigated by means of extended Nernst–Planck (ENP) equation and Donnan relationship using as main variables, ions strength, membrane charge density, membrane thickness, and with a permeation flux range of 10⁻⁶–10⁻⁵ m/s. Four different salt solutions were considered: NaCl, Na₂SO₄, NaF, and MgSO₄. Salt rejection coefficient is the main index used for analyzing NF performance for both positive and negative charged membranes. The model calculation showed an excellent agreement with experimental data and high rejection coefficient for Na₂SO₄ has been obtained. Donnan effect was the major mechanism of rejection for different salt solutions.

Key words: Nanofiltration, Membrane, Demineralization, Nernst–Planck equation

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