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

Dimulescu, Ioana Alina; Nechifor, Aurelia Cristina; Bǎrdacǎ, Cristina; Oprea, Ovidiu; Pașcu, Dumitru; Totu, Eugenia Eftimie; Albu, Paul Constantin; Nechifor, Gheorghe; Bungău, Simona

doi:10.3390/nano11051204

Cited by 26 publications

(55 citation statements)

References 63 publications

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“…The magnetic nanoparticles proposed for use in these experiments were obtained using a known electrochemical method [54], presented in detail in [22,54]. In short, the method consists of an electrolysis process in a cell with an iron anode and cathode and a silver nitrogen electrolyte, using cyclic voltammetry technique.…”

Section: Impregnated Ethylene Propylene Diene Monomer Sulfonate (Epdm-s) Magnetic Nanoparticles (Mnp) Hollow Fiber Membrane Preparation (mentioning

confidence: 99%

“…Figure 3 shows the permeation installation in variable magnetic field, previously presented in detail [54], but this time the generating element is a set of electric coils.…”

Section: Ph Correction Tests and Aluminum Ions Retention From Condensation Water 231 The Permeation Installation With I-ppmmentioning

confidence: 99%

“…2.3.1. The Permeation Installation with I-PPM Figure 3 shows the permeation installation in variable magnetic field, previously presented in detail [54], but this time the generating element is a set of electric coils. The magnetic induction of a coil is imposed based on the following relation (1) at a value similar to that given by the ferrite used in a previous work:…”

Section: Ph Correction Tests and Aluminum Ions Retention From Condensation Watermentioning

confidence: 99%

“…The hollow fiber membrane support matrix solves the following three important issues required by the membrane process [22,52,54]:…”

Section: Impregnated Ethylene Propylene Diene Monomer Sulfonate-magnetic Nanoparticles-hollow Fiber Membrane (I-ppm)mentioning

confidence: 99%

“…(a The magnetic nanoparticles required for impregnation were obtained using the electrochemical process [54] and are characterized by (Figure 5) the following:…”

Section: Impregnated Ethylene Propylene Diene Monomer Sulfonate-magnetic Nanoparticles-hollow Fiber Membrane (I-ppm)mentioning

confidence: 99%

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Improving the Performance of Composite Hollow Fiber Membranes with Magnetic Field Generated Convection Application on pH Correction

et al. 2021

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The membranes and membrane processes have succeeded in the transition from major technological and biomedical applications to domestic applications: water recycling in washing machines, recycling of used cooking oil, recovery of gasoline vapors in the pumping stations or enrichment of air with oxygen. In this paper, the neutralization of condensation water and the retention of aluminum from thermal power plants is studied using ethylene propylene diene monomer sulfonated (EPDM-S) membranes containing magnetic particles impregnated in a microporous propylene hollow fiber (I-PPM) matrix. The obtained membranes were characterized from the morphological and structural points of view, using scanning electron microscopy (SEM), high resolution SEM (HR-SEM), energy dispersive spectroscopy analysis (EDAX) and thermal gravimetric analyzer. The process performances (flow, selectivity) were studied using a variable magnetic field generated by electric coils. The results show the possibility of correcting the pH and removing aluminum ions from the condensation water of heating plants, during a winter period, without the intervention of any operator for the maintenance of the process. The pH was raised from an acidic one (2–4), to a slightly basic one (8–8.5), and the concentration of aluminum ions was lowered to the level allowed for discharge. Magnetic convection of the permeation module improves the pH correction process, but especially prevents the deposition of aluminum hydroxide on hollow fibers membranes.

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Section: Impregnated Ethylene Propylene Diene Monomer Sulfonate (Epdm-s) Magnetic Nanoparticles (Mnp) Hollow Fiber Membrane Preparation (mentioning

confidence: 99%

“…Figure 3 shows the permeation installation in variable magnetic field, previously presented in detail [54], but this time the generating element is a set of electric coils.…”

Section: Ph Correction Tests and Aluminum Ions Retention From Condensation Water 231 The Permeation Installation With I-ppmmentioning

confidence: 99%

Section: Ph Correction Tests and Aluminum Ions Retention From Condensation Watermentioning

confidence: 99%

“…The hollow fiber membrane support matrix solves the following three important issues required by the membrane process [22,52,54]:…”

Section: Impregnated Ethylene Propylene Diene Monomer Sulfonate-magnetic Nanoparticles-hollow Fiber Membrane (I-ppm)mentioning

confidence: 99%

“…(a The magnetic nanoparticles required for impregnation were obtained using the electrochemical process [54] and are characterized by (Figure 5) the following:…”

Section: Impregnated Ethylene Propylene Diene Monomer Sulfonate-magnetic Nanoparticles-hollow Fiber Membrane (I-ppm)mentioning

confidence: 99%

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Improving the Performance of Composite Hollow Fiber Membranes with Magnetic Field Generated Convection Application on pH Correction

et al. 2021

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Efficient removal of nitrophenol by magnetic ion exchange resins: Role of nitrophenol functional groups based on characterisation, DFT calculations and site energy distributions

Zhang,

Wu,

Gao

et al. 2025

Separation and Purification Technology

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Simultaneously Recovery of Thorium and Tungsten by Hybrid Electrolysis–Nanofiltration Processes

Man,

Albu,

Nechifor

et al. 2023

Preprint

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The recovery and recycling of metals that generate toxic ions in the environment is of particular importance, especially when these are tungsten and, in particular, thorium. The radioactive element thorium has unexpectedly accessible domestic applications (filaments of light bulbs and electronic tubes, welding electrodes, working alloys containing aluminum and magnesium), which lead to its appearance in electrical and electronic waste from municipal waste management platforms. The current paper proposes the simultaneous recovery of waste containing tungsten and thorium from welding electrodes. The simultaneous recovery is done by applying a hybrid membrane electrolysis technology coupled with nanofiltration. An electrolysis cell with sulphonated polyether–ether–ketone membranes (sPEEK) and a nanofiltration module with chitosan-polypropylene membranes (C–PHF–M) are used to carry out the hybrid process. The analysis of welding electrodes led to a composition of: W (tungsten) 89.4%; Th 7.1%; O2 2.5% and Al 1.1%. Thus, the parameters of the electrolysis process were chosen according to the speciation of the three metals suggested by the superimposed Pourbaix diagrams. At a constant potential of 20.0 V and an electrolysis current of 1.0 A, the pH is varied and the possible composition of the solution in the anodic workspace is analyzed. Favorable conditions for both electrolysis and nanofiltration were obtained at pH from 6 to 9, when the soluble tungstate ion, the aluminum hydroxide and solid thorium dioxide were formed. Through a first nanofiltration, the tungstate ion is obtained in the permeate, and thorium dioxide and aluminum hydroxide in the concentrate. By adding a pH 13 solution over the two precipitates, the aluminum is solubilized as sodium aluminate which will be found after the second nanofiltration in permeate, the thorium dioxide remaining integrally (within an error of ±0.1ppm) on the C–PHF–M membrane.

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

Cited by 26 publications

References 63 publications

Improving the Performance of Composite Hollow Fiber Membranes with Magnetic Field Generated Convection Application on pH Correction

Improving the Performance of Composite Hollow Fiber Membranes with Magnetic Field Generated Convection Application on pH Correction

Efficient removal of nitrophenol by magnetic ion exchange resins: Role of nitrophenol functional groups based on characterisation, DFT calculations and site energy distributions

Simultaneously Recovery of Thorium and Tungsten by Hybrid Electrolysis–Nanofiltration Processes

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