Biocompatible Fe3O4@SiO2-NH2 nanocomposite as a green nanofiller embedded in PES–nanofiltration membrane matrix for salts, heavy metal ion and dye removal: Long–term operation and reusability tests

Kamari, Soran; Shahbazi, Afsaneh

doi:10.1016/j.chemosphere.2019.125282

Cited by 146 publications

(48 citation statements)

References 23 publications

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“…The FT-IR spectra ( Figure 4 ) show the appearance of new bands upon the transition Fe 3 O 4 → Fe 3 O 4 @SiO 2 → Fe 3 O 4 @SiO 2 -NH 2 → Fe 3 O 4 @SiO 2 -NH 2 -EY evidencing the appearance of chemical bonds. In the spectrum of pure Fe 3 O 4 NPs, the strong band at 580 cm −1 is due to Fe-O stretching vibrations in accordance with other authors [ 9 , 11 , 13 ]. This band is observed in the spectra of all the samples.…”

Section: Results and Discursionsupporting

confidence: 91%

“…This band can be related to the asymmetric stretching vibrations of Si-O-Si. An analogous band was observed and interpreted equally by all the authors studying Fe 3 O 4 @SiO 2 NPs [ 9 , 11 , 13 ]. Symmetric Si-O-Si stretching vibrations were associated in [ 9 ] with the weak band near 808 cm −1 .…”

Section: Results and Discursionsupporting

confidence: 75%

“…The fields of application of Fe 3 O 4 @SiO 2 NPs functionalized with different surfactants, and more frequently with amines, are different. A number of authors have demonstrated their effective applications in biology and medicine [ 1 , 2 ], in catalysis [ 3 , 4 ], and, especially, as effective adsorbents for the removal of pollutants from wastewaters [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. In ref.…”

Section: Introductionmentioning

confidence: 99%

“…In Refs. [ 7 , 9 ], the synthesized Fe 3 O 4 @SiO 2 -NH 2 nanocomposites were embedded into the polyether-sulfone membranes with different concentrations via the phase inversion method. Due to the nanocomposite adsorption properties, the significant enhancement in efficiency of the modified membranes for the removal of Cd(II) ions and methyl red dye was achieved.…”

Section: Introductionmentioning

confidence: 99%

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Amino-Functionalized Fe3O4@SiO2 Core-Shell Magnetic Nanoparticles for Dye Adsorption

et al. 2021

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Fe3O4@SiO2 core-shell nanoparticles (NPs) were synthesized with the co-precipitation method and functionalized with NH2 amino-groups. The nanoparticles were characterized by X-ray, FT-IR spectroscopy, transmission electron microscopy, selected area electron diffraction, and vibrating sample magnetometry. The magnetic core of all the nanoparticles was shown to be nanocrystalline with the crystal parameters corresponding only to the Fe3O4 phase covered with a homogeneous amorphous silica (SiO2) shell of about 6 nm in thickness. The FT-IR spectra confirmed the appearance of chemical bonds at amino functionalization. The magnetic measurements revealed unusually high saturation magnetization of the initial Fe3O4 nanoparticles, which was presumably associated with the deviations in the Fe ion distribution between the tetrahedral and octahedral positions in the nanocrystals as compared to the bulk stoichiometric magnetite. The fluorescent spectrum of eosin Y-doped NPs dispersed in water solution was obtained and a red shift and line broadening (in comparison with the dye molecules being free in water) were revealed and explained. Most attention was paid to the adsorption properties of the nanoparticles with respect to three dyes: methylene blue, Congo red, and eosin Y. The kinetic data showed that the adsorption processes were associated with the pseudo-second order mechanism for all three dyes. The equilibrium data were more compatible with the Langmuir isotherm and the maximum adsorption capacity was reached for Congo red.

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Section: Results and Discursionsupporting

confidence: 91%

Section: Results and Discursionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Amino-Functionalized Fe3O4@SiO2 Core-Shell Magnetic Nanoparticles for Dye Adsorption

et al. 2021

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“…Their relatively poor performance in NF and RO systems is attributed by some in the literature to their weak mechanical stability as a consequence of their high amorphous and lower hydrophilic character [20][21][22][23]. As a result, PES membrane utilisation in NF/RO application is highly prone to fouling, which is considered the main limitation to the use of PES membranes in highly pressurised separation processes [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Development of ZSM-22/Polyethersulfone Membrane for Effective Salt Rejection

2020

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ZSM-22/polyethersulfone membranes were prepared for salt rejection using modelled brackish water. The membranes were fabricated via direct ZSM-22 incorporation into a polymer matrix, thereby inducing the water permeability, hydrophilicity and fouling resistance of the pristine polyethersulfone (PES) membrane. A ZSM-22 zeolite material with a 60 Si/Al ratio, high crystallinity and needle-like morphologies was produced and effectively used as a nanoadditive in the development of ZSM-22/PES membranes with nominal loadings of 0–0.75 wt.%. The characterisation and membrane performance evaluation of the resulting materials with XRD, BET, FTIR, TEM, SEM and contact angle as well as dead-end cell, respectively, showed improved water permeability in comparison with the pristine PES membrane. These ZSM-22/PES membranes were found to be more effective and superior in the processing of modelled brackish water. The salt rejection of the prepared membranes for NaCl and MgCl2 was effective, while they exhibited quite improved water flux and flux recovery ratios in the membrane permeability and anti-fouling test. This indicates that different amounts of ZSM-22 nanoadditives produce widely divergent influences on the performance of the pristine PES membrane. As such, over 55% of salt rejection is observed, which means that the obtained membranes are effective in salt removal from water.

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