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Osmium Nanoparticles-Polypropylene Hollow Fiber Membranes Applied in Redox Processes

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...

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Autores principales: Nechifor, Gheorghe, Păncescu, Florentina Mihaela, Grosu, Alexandra Raluca, Albu, Paul Constantin, Oprea, Ovidiu, Tanczos, Szidonia-Katalin, Bungău, Constantin, Grosu, Vlad-Alexandru, Pîrțac, Andreia, Nechifor, Aurelia Cristina
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8537536/
https://www.ncbi.nlm.nih.gov/pubmed/34684968
http://dx.doi.org/10.3390/nano11102526
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author Nechifor, Gheorghe
Păncescu, Florentina Mihaela
Grosu, Alexandra Raluca
Albu, Paul Constantin
Oprea, Ovidiu
Tanczos, Szidonia-Katalin
Bungău, Constantin
Grosu, Vlad-Alexandru
Pîrțac, Andreia
Nechifor, Aurelia Cristina
author_facet Nechifor, Gheorghe
Păncescu, Florentina Mihaela
Grosu, Alexandra Raluca
Albu, Paul Constantin
Oprea, Ovidiu
Tanczos, Szidonia-Katalin
Bungău, Constantin
Grosu, Vlad-Alexandru
Pîrțac, Andreia
Nechifor, Aurelia Cristina
author_sort Nechifor, Gheorghe
collection PubMed
description 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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spelling pubmed-85375362021-10-24 Osmium Nanoparticles-Polypropylene Hollow Fiber Membranes Applied in Redox Processes Nechifor, Gheorghe Păncescu, Florentina Mihaela Grosu, Alexandra Raluca Albu, Paul Constantin Oprea, Ovidiu Tanczos, Szidonia-Katalin Bungău, Constantin Grosu, Vlad-Alexandru Pîrțac, Andreia Nechifor, Aurelia Cristina Nanomaterials (Basel) Article 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. MDPI 2021-09-27 /pmc/articles/PMC8537536/ /pubmed/34684968 http://dx.doi.org/10.3390/nano11102526 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Nechifor, Gheorghe
Păncescu, Florentina Mihaela
Grosu, Alexandra Raluca
Albu, Paul Constantin
Oprea, Ovidiu
Tanczos, Szidonia-Katalin
Bungău, Constantin
Grosu, Vlad-Alexandru
Pîrțac, Andreia
Nechifor, Aurelia Cristina
Osmium Nanoparticles-Polypropylene Hollow Fiber Membranes Applied in Redox Processes
title Osmium Nanoparticles-Polypropylene Hollow Fiber Membranes Applied in Redox Processes
title_full Osmium Nanoparticles-Polypropylene Hollow Fiber Membranes Applied in Redox Processes
title_fullStr Osmium Nanoparticles-Polypropylene Hollow Fiber Membranes Applied in Redox Processes
title_full_unstemmed Osmium Nanoparticles-Polypropylene Hollow Fiber Membranes Applied in Redox Processes
title_short Osmium Nanoparticles-Polypropylene Hollow Fiber Membranes Applied in Redox Processes
title_sort osmium nanoparticles-polypropylene hollow fiber membranes applied in redox processes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8537536/
https://www.ncbi.nlm.nih.gov/pubmed/34684968
http://dx.doi.org/10.3390/nano11102526
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