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. 2021 May 1;11(5):1204.
doi: 10.3390/nano11051204.

Accessible Silver-Iron Oxide Nanoparticles as a Nanomaterial for Supported Liquid Membranes

Ioana Alina Dimulescu Nica  1 , Aurelia Cristina Nechifor  1 , Cristina Bǎrdacǎ Urducea  1 , Ovidiu Oprea  2 , Dumitru Paşcu  1 , Eugenia Eftimie Totu  1 , Paul Constantin Albu  3 , Gheorghe Nechifor  1 , Simona Gabriela Bungău  4
Affiliations

Accessible Silver-Iron Oxide Nanoparticles as a Nanomaterial for Supported Liquid Membranes

Ioana Alina Dimulescu Nica et al. Nanomaterials (Basel). .

Abstract

The present study introduces the process performances of nitrophenols pertraction using new liquid supported membranes under the action of a magnetic field. The membrane system is based on the dispersion of silver-iron oxide nanoparticles in n-alcohols supported on hollow microporous polypropylene fibers. The iron oxide-silver nanoparticles are obtained directly through cyclic voltammetry electrolysis run in the presence of soluble silver complexes ([AgCl2]-; [Ag(S2O3)2]3-; [Ag(NH3)2]+) and using pure iron electrodes. The nanostructured particles are characterized morphologically and structurally by scanning electron microscopy (SEM and HFSEM), EDAX, XRD, and thermal analysis (TG, DSC). The performances of the nitrophenols permeation process are investigated in a variable magnetic field. These studies show that the flux and extraction efficiency have the highest values for the membrane system embedding iron oxide-silver nanoparticles obtained electrochemically in the presence of [Ag(NH3)2]+ electrolyte. It is demonstrated that the total flow of nitrophenols through the new membrane system depends on diffusion, convection, and silver-assisted transport.

Keywords: Ag–Fe oxide nanoparticles; liquid membranes; magnetic nanocarriers; nanoparticles electrochemical synthesis; silver recovery.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Polypropylene hollow fiber: (a) hollow fiber bundle; (b) detail; (c) individual hollow fiber cross-section (SEM image).
Figure 2
Figure 2
Schematic presentation of the pertraction module and its principal components: 1–pertraction module, 2—hollow-fiber membrane, 3—annular ferrite, 4—oscillatory system, 5—reservoirs: SP-source phase, RP-receiving phase, 6-pumps.
Figure 3
Figure 3
SEM images. (a) NP1 morphologies (b) NP2 morphologies; (c) NP3 morphologies.
Figure 3
Figure 3
SEM images. (a) NP1 morphologies (b) NP2 morphologies; (c) NP3 morphologies.
Figure 4
Figure 4
Detailed thermal diagrams for nanoparticles: NP1, NP2, NP3, and a sample of nanoparticles after processing (NPP).
Figure 5
Figure 5
The magnetization diagrams for NP1, NP2, and NP3.
Figure 6
Figure 6
The source phase variation during the operation at a constant magnetic stirring regime (40 oscillations/min) for the three types of nanoparticles in n-decanol: (a) o-nitrophenol and (b) m-nitrophenol.
Figure 7
Figure 7
The variation of extraction efficiency for o-nitrophenol after 20 min of operating with nanoparticles dispersed against the stirring regime in the two considered alcohols: (a) n-octanol and (b) n-decanol.
Figure 8
Figure 8
SEM images of the morphological aspect of the membrane support: (a) cross-section of the microporous polypropylene; (b) the surface of the microporous polypropylene; (c) a cross-section of the polypropylene fiber impregnated with nanoparticles dispersion; and (d) surface of the polypropylene impregnated with nanoparticles dispersion.
Figure 9
Figure 9
Schematic representation of the membrane system with magnetic iron oxide–silver nanoparticles onto the polypropylene fibers support.
Figure 10
Figure 10
The unitary behavior of the silver–iron oxide membrane material: (a) at separation from aqueous solution; (b) in the dry state (in the air); (c) SEM detail presentation.
Figure 11
Figure 11
The pertraction mechanism through supported liquid membranes. (a) membrane system and specific fluxes (J); (b) assisted nanoparticle transport mechanism for m- and o-nitrophenol.
See this image and copyright information in PMC

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