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Superparamagnetic polyvinylpyrrolidone/chitosan/ Fe 3 O 4 electrospun nanofibers as effective U( VI ) adsorbents
Author(s) -
Philippou Katerina,
Christou Christos N.,
Socoliuc Vlad,
Vekas Ladislau,
Tanasă Eugenia,
Miclau Marinela,
Pashalidis Ioannis,
KrasiaChristoforou Theodora
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50212
Subject(s) - polyvinylpyrrolidone , adsorption , aqueous solution , nuclear chemistry , materials science , fourier transform infrared spectroscopy , superparamagnetism , langmuir adsorption model , chitosan , desorption , scanning electron microscope , chemical engineering , nanofiber , chemistry , polymer chemistry , nanotechnology , organic chemistry , composite material , magnetization , physics , quantum mechanics , magnetic field , engineering
Magnetoactive electrospun fibrous membranes consisting of polyvinylpyrrolidone (PVP), chitosan (CS) and pre‐fabricated, double‐layer oleic acid‐coated magnetite nanoparticles (OA.OA.Fe 3 O 4 ) were fabricated and evaluated as new adsorbent materials for the removal and recovery of uranium (U(VI)) from aqueous solutions. The adsorption has been investigated by batch‐type experiments and the solid material has been characterized by X‐ray diffraction spectroscopy (XRD), Fourier‐transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy/energy dispersive X‐ray analysis (TEM/EDX) and vibration sample magnetometry (VSM) measurements prior and after uranium adsorption. The experimental adsorption data were found to be well fitted with the Langmuir isotherm and the pseudo‐second order kinetic model. The results indicate that PVP/CS/OA.OA.Fe 3 O 4 fibrous adsorbents exhibit good adsorption properties towards U(VI) in aqueous solutions, achieving a q max value of 0.77 mol kg −1 (183.3 mg g −1 ) at pH 6.0. The experiments regarding the regeneration and reuse of the magnetoactive adsorbents were carried out using Na 2 CO 3 , at pH ~11. After four cycles, the percentage relative adsorption remained stable (~100%) whereas the desorption percentage decreased from 31.9% to 21.0%. Generally, the presented results demonstrate that the incorporation of the Fe 3 O 4 NPs has a positive effect on the adsorption efficiency of U(VI) from aquatic environments.