Fe2+ Removal from Water Using PVDF Membranes, Modified with Magnetite Nanoparticles, by Polyelectrolyte Enhanced Ultrafiltration
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Date
2018
Authors
Konovalova, Victoria
Kolesnyk, Iryna
Ivanenko, Olena
Burban, Anatoliy
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Journal ISSN
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Abstract
The aim of this study was to show results of Fe2+ removal from water by polyelectrolyte
enhanced ultrafiltration on polyvinylidene fluoride membranes modified with magnetite
nanoparticles. Magnetite nanoparticles were synthesized by the co-precipitation method and
stabilized with sodium polyacrylate. At first stage, the surface of PVDF membranes was
modified by grafting of polyethylenimine. At the second stage the polyelectrolyte, grafted to
the membrane surface, was used as a linker for magnetite nanoparticles immobilization.
The modification of membranes was confirmed by IR spectroscopy, scanning electron microscopy and electro kinetic analysis. The dependence of zeta-potential on pH for PVDF
membrane modified with PEI has confirmed the modification of the membrane surface as
zeta-potential increases with pH decrease. SEM has shown that the surface of modified
membrane is densely covered with nanoparticles, which form clusters. The dependence of
the volumetric flux on the applied pressure at various concentrations of the carboxymethylcellulose (CMC) has been studied. Polyelectrolyte enhanced ultrafiltration with CMC has
been used for iron(II) removal at initial Fe2+ concentration of 20 mg/L. The concentrations
of iron(II) in permeate using an unmodified membrane has ranged from 0.6 to 1.0 mg/L,
whereas for the modified membrane it has been 0.02÷0.08 mg/L.
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Keywords
polyvinylidene fluoride membrane, magnetite nanoparticles, polyelectrolyte enhanced ultrafiltration, carboxymethylcellulose, article
Citation
Fe2+ Removal from Water Using PVDF Membranes, Modified with Magnetite Nanoparticles, by Polyelectrolyte Enhanced Ultrafiltration / V. Konovalova, I. Kolesnyk, O. Ivanenko, A. Burban // Engineering and Protection of Environment. - 2018. - P. 39-49.