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Effects of Different TiO(2)/CNT Coatings of PVDF Membranes on the Filtration of Oil-Contaminated Wastewaters

Six different TiO(2)/CNT nanocomposite-coated polyvinylidene-fluoride (PVDF) microfilter membranes (including –OH or/and –COOH functionalized CNTs) were evaluated in terms of their performance in filtering oil-in-water emulsions. In the early stages of filtration, until reaching a volume reduction r...

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Autores principales: Fazekas, Ákos Ferenc, Gyulavári, Tamás, Pap, Zsolt, Bodor, Attila, Laczi, Krisztián, Perei, Katalin, Illés, Erzsébet, László, Zsuzsanna, Veréb, Gábor
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10608089/
https://www.ncbi.nlm.nih.gov/pubmed/37887984
http://dx.doi.org/10.3390/membranes13100812
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author Fazekas, Ákos Ferenc
Gyulavári, Tamás
Pap, Zsolt
Bodor, Attila
Laczi, Krisztián
Perei, Katalin
Illés, Erzsébet
László, Zsuzsanna
Veréb, Gábor
author_facet Fazekas, Ákos Ferenc
Gyulavári, Tamás
Pap, Zsolt
Bodor, Attila
Laczi, Krisztián
Perei, Katalin
Illés, Erzsébet
László, Zsuzsanna
Veréb, Gábor
author_sort Fazekas, Ákos Ferenc
collection PubMed
description Six different TiO(2)/CNT nanocomposite-coated polyvinylidene-fluoride (PVDF) microfilter membranes (including –OH or/and –COOH functionalized CNTs) were evaluated in terms of their performance in filtering oil-in-water emulsions. In the early stages of filtration, until reaching a volume reduction ratio (VRR) of ~1.5, the membranes coated with functionalized CNT-containing composites provided significantly higher fluxes than the non-functionalized ones, proving the beneficial effect of the surface modifications of the CNTs. Additionally, until the end of the filtration experiments (VRR = 5), notable flux enhancements were achieved with both TiO(2) (~50%) and TiO(2)/CNT-coated membranes (up to ~300%), compared to the uncoated membrane. The irreversible filtration resistances of the membranes indicated that both the hydrophilicity and surface charge (zeta potential) played a crucial role in membrane fouling. However, a sharp and significant flux decrease (~90% flux reduction ratio) was observed for all membranes until reaching a VRR of 1.1–1.8, which could be attributed to the chemical composition of the oil. Gas chromatography measurements revealed a lack of hydrocarbon derivatives with polar molecular fractions (which can act as natural emulsifiers), resulting in significant coalescent ability (and less stable emulsion). Therefore, this led to a more compact cake layer formation on the surface of the membranes (compared to a previous study). It was also demonstrated that all membranes had excellent purification efficiency (97–99.8%) regarding the turbidity, but the effectiveness of the chemical oxygen demand reduction was slightly lower, ranging from 93.7% to 98%.
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spelling pubmed-106080892023-10-28 Effects of Different TiO(2)/CNT Coatings of PVDF Membranes on the Filtration of Oil-Contaminated Wastewaters Fazekas, Ákos Ferenc Gyulavári, Tamás Pap, Zsolt Bodor, Attila Laczi, Krisztián Perei, Katalin Illés, Erzsébet László, Zsuzsanna Veréb, Gábor Membranes (Basel) Article Six different TiO(2)/CNT nanocomposite-coated polyvinylidene-fluoride (PVDF) microfilter membranes (including –OH or/and –COOH functionalized CNTs) were evaluated in terms of their performance in filtering oil-in-water emulsions. In the early stages of filtration, until reaching a volume reduction ratio (VRR) of ~1.5, the membranes coated with functionalized CNT-containing composites provided significantly higher fluxes than the non-functionalized ones, proving the beneficial effect of the surface modifications of the CNTs. Additionally, until the end of the filtration experiments (VRR = 5), notable flux enhancements were achieved with both TiO(2) (~50%) and TiO(2)/CNT-coated membranes (up to ~300%), compared to the uncoated membrane. The irreversible filtration resistances of the membranes indicated that both the hydrophilicity and surface charge (zeta potential) played a crucial role in membrane fouling. However, a sharp and significant flux decrease (~90% flux reduction ratio) was observed for all membranes until reaching a VRR of 1.1–1.8, which could be attributed to the chemical composition of the oil. Gas chromatography measurements revealed a lack of hydrocarbon derivatives with polar molecular fractions (which can act as natural emulsifiers), resulting in significant coalescent ability (and less stable emulsion). Therefore, this led to a more compact cake layer formation on the surface of the membranes (compared to a previous study). It was also demonstrated that all membranes had excellent purification efficiency (97–99.8%) regarding the turbidity, but the effectiveness of the chemical oxygen demand reduction was slightly lower, ranging from 93.7% to 98%. MDPI 2023-09-27 /pmc/articles/PMC10608089/ /pubmed/37887984 http://dx.doi.org/10.3390/membranes13100812 Text en © 2023 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
Fazekas, Ákos Ferenc
Gyulavári, Tamás
Pap, Zsolt
Bodor, Attila
Laczi, Krisztián
Perei, Katalin
Illés, Erzsébet
László, Zsuzsanna
Veréb, Gábor
Effects of Different TiO(2)/CNT Coatings of PVDF Membranes on the Filtration of Oil-Contaminated Wastewaters
title Effects of Different TiO(2)/CNT Coatings of PVDF Membranes on the Filtration of Oil-Contaminated Wastewaters
title_full Effects of Different TiO(2)/CNT Coatings of PVDF Membranes on the Filtration of Oil-Contaminated Wastewaters
title_fullStr Effects of Different TiO(2)/CNT Coatings of PVDF Membranes on the Filtration of Oil-Contaminated Wastewaters
title_full_unstemmed Effects of Different TiO(2)/CNT Coatings of PVDF Membranes on the Filtration of Oil-Contaminated Wastewaters
title_short Effects of Different TiO(2)/CNT Coatings of PVDF Membranes on the Filtration of Oil-Contaminated Wastewaters
title_sort effects of different tio(2)/cnt coatings of pvdf membranes on the filtration of oil-contaminated wastewaters
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10608089/
https://www.ncbi.nlm.nih.gov/pubmed/37887984
http://dx.doi.org/10.3390/membranes13100812
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