Control of Nanostructured Polysulfone Membrane Preparation by Phase Inversion Method

Urducea, Cristina Bărdacă; Nechifor, Aurelia Cristina; Dimulescu, Ioana Alina; Oprea, Ovidiu; Nechifor, Gheorghe; Totu, Eugenia Eftimie; Işıldak, İbrahim; Albu, Paul Constantin; Bungău, Simona

doi:10.3390/nano10122349

Cited by 45 publications

(26 citation statements)

References 59 publications

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“…The 10% polysulfone casting solution in dimethylformamide (DMF) was performed at room temperature (24 ± 1 °C ) and humidity (61 ± 1%), using a certain amount of solution and applying it directly to a smooth glass surface (intended for thin-layer chromatography) to a thickness of 500μm. Immersion in the ethanol-water (EW) coagulation bath, in a 1:1 volume ratio, was performed after a predetermined time [55,56]. Cellulose acetate (CA) (Figure 3b) powder, respectively, Mn = 50,000 g/mol, = 1.3 g/cm 3 (Sigma-Aldrich, Merck KGaA, Darmstadt, Germany).…”

Section: Reagents and Materialsmentioning

confidence: 99%

Reactional Processes on Osmium–Polymeric Membranes for 5–Nitrobenzimidazole Reduction

et al. 2021

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Membranes are associated with the efficient processes of separation, concentration and purification, but a very important aspect of them is the realization of a reaction process simultaneously with the separation process. From a practical point of view, chemical reactions have been introduced in most membrane systems: with on-liquid membranes, with inorganic membranes or with polymeric and/or composite membranes. This paper presents the obtaining of polymeric membranes containing metallic osmium obtained in situ. Cellulose acetate (CA), polysulfone (PSf) and polypropylene hollow fiber membranes (PPM) were used as support polymer membranes. The metallic osmium is obtained directly onto the considered membranes using a solution of osmium tetroxide (OsO4), dissolved in tert–butyl alcohol (t–Bu–OH) by reduction with molecular hydrogen. The composite osmium–polymer (Os–P)-obtained membranes were characterized in terms of the morphological and structural points of view: scanning electron microscopy (SEM), high-resolution SEM (HR–SEM), energy-dispersive spectroscopy analysis (EDAX), Fourier Transform Infra-Red (FTIR) spectroscopy, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The process performance was tested for reduction of 5–nitrobenzimidazole to 5–aminobenzimidazole with molecular hydrogen. The paper presents the main aspects of the possible mechanism of transformation of 5–nitrobenzimidazole to 5–aminobenzimidazole with hydrogen gas in the reaction system with osmium–polymer membrane (Os–P).

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Section: Reagents and Materialsmentioning

confidence: 99%

Reactional Processes on Osmium–Polymeric Membranes for 5–Nitrobenzimidazole Reduction

et al. 2021

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“…The conversion (η %) of analytes calculated using the solution's concentration (2) or absorbance (3) [64,65] were:…”

Section: Carrying Out the Process Of Oxidation Or Reductionmentioning

confidence: 99%

Osmium Nanoparticles-Polypropylene Hollow Fiber Membranes Applied in Redox Processes

et al. 2021

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Composite membranes play a very important role in the separation, concentration, and purification processes, but especially in membrane reactors and membrane bioreactors. The development of composite membranes has gained momentum especially through the involvement of various nanoparticles, polymeric, oxide, or metal, that have contributed to increasing their reactivity and selectivity. This paper presents the preparation and characterization of an active metal nanoparticle-support polymer type composite membrane, based on osmium nanoparticles obtained in situ on a polypropylene hollow fiber membrane. Osmium nanoparticles are generated from a solution of osmium tetroxide in tert-butyl alcohol by reduction with molecular hydrogen in a contactor with a polypropylene membrane. The composite osmium-polypropylene hollow fiber obtained membranes (Os-PPM) were characterized from the morphological and structural points of view: scanning electron microscopy (SEM), high resolution SEM (HR-SEM), energy dispersive spectroscopy analysis (EDAX), X-ray diffraction analysis (XRD), Fourier transform Infrared (FTIR) spectroscopy, thermal gravimetric analysis, and differential scanning calorimetry (TGA, DSC). The process performance was tested in a redox process of p-nitrophenol and 10-undecylenic (10-undecenoic) acid, as a target substance of biological or biomedical interest, in solutions of lower aliphatic alcohols in a membrane contactor with a prepared composite membrane. The characteristics of osmium nanoparticles-polypropylene hollow fiber membranes open the way to biological and biotechnological applications. These membranes do not contaminate the working environment, operate at relatively low temperatures, provide a large contact area between reactants, allow successive oxidation and reduction operations in the same module, and help to recover the reaction mass by ultrafiltration. The results obtained show that the osmium-polypropylene composite membrane allows the reduction of p-nitrophenol or the oxidation of 10-undecylenic acid, the conversion depending on the concentration in the lower aliphatic alcohol, the nature of the lower aliphatic alcohol, and the oxidant or reducing flow through the membrane contactor.

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“…The same extraction efficiency can also be computed based upon the absorbance of the solutions [47][48][49][50], as in:…”

Section: The Transport and Separation Of The Silver Ionsmentioning

confidence: 99%

Transport and Separation of the Silver Ion with n–decanol Liquid Membranes Based on 10–undecylenic Acid, 10–undecen–1–ol and Magnetic Nanoparticles

et al. 2021

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This paper presents a transport and recovery of silver ions through bulk liquid membranes based on n–decanol using as carriers 10–undecylenic acid and 10–undecylenyl alcohol. The transport of silver ions across membranes has been studied in the presence of two types of magnetic oxide nanoparticles obtained by the electrochemical method with iron electrodes in the electrolyte with and without silver ions, which act as promoters of turbulence in the membrane. Separation of silver ions by bulk liquid membranes using 10–undecylenic acid and 10–undecylenyl alcohol as carriers were performed by comparison with lead ions. The configuration of the separation module has been specially designed for the chosen separation process. Convective-generating magnetic nanoparticles were characterized in terms of the morphological and structural points of view: scanning electron microscopy (SEM), high-resolution SEM (HR–SEM), energy dispersive spectroscopy analysis (EDAX), Fourier Transform InfraRed (FTIR) spectroscopy, thermal gravimetric analysis (TGA), differential scanning calorimetry and magnetization. The process performance (flux and selectivity) was tested were tested for silver ion transport and separation through n–decanol liquid membranes with selected carriers. Under the conditions of the optimized experimental results (pH = 7 of the source phase, pH = 1 of the receiving phase, flow rate of 30 mL/min for the source phase and 9 mL/min for the receiving phase, 150 rot/min agitation of magnetic nanoparticles) separation efficiencies of silver ions of over 90% were obtained for the transport of undecenoic acid and about 80% for undecylenyl alcohol.

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Control of Nanostructured Polysulfone Membrane Preparation by Phase Inversion Method

Cited by 45 publications

References 59 publications

Reactional Processes on Osmium–Polymeric Membranes for 5–Nitrobenzimidazole Reduction

Reactional Processes on Osmium–Polymeric Membranes for 5–Nitrobenzimidazole Reduction

Osmium Nanoparticles-Polypropylene Hollow Fiber Membranes Applied in Redox Processes

Transport and Separation of the Silver Ion with n–decanol Liquid Membranes Based on 10–undecylenic Acid, 10–undecen–1–ol and Magnetic Nanoparticles

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