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- 저자 : Arnout D’Haese (검색결과 1 건)
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Oluranti Agboola,Jannie Maree,Richard Mbaya,Andrei Kolesnikov,Rotimi Sadiku,Arne Verliefde,Arnout D’Haese 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
The nanofiltration (NF) process is electrostatically governed and the surface free energy plays a key role inthe separation of particulates, macromolecules, and dissolved ionic species. Streaming potential measurement and thesurface charge mapping by Kelvin probe atomic force mircoscopy (AFM) have been carried out. Forces of interactionnear 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 thatthe three acquired signals from non-contact AFM (contact potential difference, amplitude and phase) were rigorouslyconnected 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 performanceof the NF membranes was further investigated for the removal of nickel ions from aqueous solution, and theresults were correlated to the mechanical responses of the nanofiltration membranes obtained from AFM and the streamingpotential measurement.
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