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Microscopical characterizations of nanofiltration membranes for the removal of nickel ions from aqueous solution

Agboola, Oluranti and Maree, Jannie and Mbaya, Richard and Kolesnikov, Andrei and Sadiku, Rotimi Emmanuel and Verliefde, Arne and D’Haese, Arnout (2015) Microscopical characterizations of nanofiltration membranes for the removal of nickel ions from aqueous solution. Korean J. Chem. Eng, 32 (4). pp. 731-742. ISSN 1975-7220

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The nanofiltration (NF) process is electrostatically governed and the surface free energy plays a key role in the separation of particulates, macromolecules, and dissolved ionic species. Streaming potential measurement and the surface charge mapping by Kelvin probe atomic force mircoscopy (AFM) have been carried out. Forces of interaction near the surface of nanofiltration membranes were further studied by a force spectroscopy using atomic force microscopy. The two membranes used are more negatively charged at high pH values; hence the higher the solution chemistry, the higher and faster will be adhesion of ions on the surface of the nanofiltration membranes. It was observed that the three acquired signals from non-contact AFM (contact potential difference, amplitude and phase) were rigorously connected to the surface structure of the nanofiltration membranes. In addition to the surface structure (roughness), electrostatic interactions can also enhance initial particle adhesion to surfaces of nanofiltration membranes. The performance of the NF membranes was further investigated for the removal of nickel ions from aqueous solution, and the results were correlated to the mechanical responses of the nanofiltration membranes obtained from AFM and the streaming potential measurement.

Item Type: Article
Uncontrolled Keywords: Nanofiltration Membranes, Streaming Potential, Surface Charge, Atomic Force Microscopy, Forces of Interaction, Amplitude Mode
Subjects: T Technology > T Technology (General)
T Technology > TP Chemical technology
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 23 Mar 2017 08:39
Last Modified: 23 Mar 2017 08:39

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