Magnetic silica particles functionalized with guanidine derivatives for microwave-assisted transesterification of waste oil

Abstract This study aimed to develop a facile synthesis procedure for heterogeneous catalysts based on organic guanidine derivatives superbases chemically grafted on silica-coated Fe3O4 magnetic nanoparticles. Thus, the three organosilanes that were obtained by reacting the selected carbodiimides (N...

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Autores principales:	Petre Chipurici, Alexandru Vlaicu, Ioan Călinescu, Mircea Vînătoru, Cristina Busuioc, Adrian Dinescu, Adi Ghebaur, Edina Rusen, Georgeta Voicu, Maria Ignat, Aurel Diacon
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/84147a0173fa4b7a8319ad57b1059da8
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spelling	oai:doaj.org-article:84147a0173fa4b7a8319ad57b1059da82021-12-02T15:29:03ZMagnetic silica particles functionalized with guanidine derivatives for microwave-assisted transesterification of waste oil10.1038/s41598-021-97097-72045-2322https://doaj.org/article/84147a0173fa4b7a8319ad57b1059da82021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-97097-7https://doaj.org/toc/2045-2322Abstract This study aimed to develop a facile synthesis procedure for heterogeneous catalysts based on organic guanidine derivatives superbases chemically grafted on silica-coated Fe3O4 magnetic nanoparticles. Thus, the three organosilanes that were obtained by reacting the selected carbodiimides (N,N′-dicyclohexylcarbodiimide (DCC), N,N′-diisopropylcarbodiimide (DIC), respectively 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) with 3-aminopropyltriethoxysilane (APTES) were used in a one-pot synthesis stage for the generation of a catalytic active protective shell through the simultaneous hydrolysis/condensation reaction with tetraethyl orthosilicate (TEOS). The catalysts were characterized by FTIR, TGA, SEM, BET and XRD analysis confirming the successful covalent attachment of the organic derivatives in the silica shell. The second aim was to highlight the capacity of microwaves (MW) to intensify the transesterification process and to evaluate the activity, stability, and reusability characteristics of the catalysts. Thus, in MW-assisted transesterification reactions, all catalysts displayed FAME yields of over 80% even after 5 reactions/activation cycles. Additionally, the influence of FFA content on the catalytic activity was investigated. As a result, in the case of Fe3O4@SiO2-EDG, a higher tolerance towards the FFA content can be noticed with a FAME yield of over 90% (for a 5% (weight) vs oil catalyst content) and 5% weight FFA content.Petre ChipuriciAlexandru VlaicuIoan CălinescuMircea VînătoruCristina BusuiocAdrian DinescuAdi GhebaurEdina RusenGeorgeta VoicuMaria IgnatAurel DiaconNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Petre Chipurici Alexandru Vlaicu Ioan Călinescu Mircea Vînătoru Cristina Busuioc Adrian Dinescu Adi Ghebaur Edina Rusen Georgeta Voicu Maria Ignat Aurel Diacon Magnetic silica particles functionalized with guanidine derivatives for microwave-assisted transesterification of waste oil
description	Abstract This study aimed to develop a facile synthesis procedure for heterogeneous catalysts based on organic guanidine derivatives superbases chemically grafted on silica-coated Fe3O4 magnetic nanoparticles. Thus, the three organosilanes that were obtained by reacting the selected carbodiimides (N,N′-dicyclohexylcarbodiimide (DCC), N,N′-diisopropylcarbodiimide (DIC), respectively 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) with 3-aminopropyltriethoxysilane (APTES) were used in a one-pot synthesis stage for the generation of a catalytic active protective shell through the simultaneous hydrolysis/condensation reaction with tetraethyl orthosilicate (TEOS). The catalysts were characterized by FTIR, TGA, SEM, BET and XRD analysis confirming the successful covalent attachment of the organic derivatives in the silica shell. The second aim was to highlight the capacity of microwaves (MW) to intensify the transesterification process and to evaluate the activity, stability, and reusability characteristics of the catalysts. Thus, in MW-assisted transesterification reactions, all catalysts displayed FAME yields of over 80% even after 5 reactions/activation cycles. Additionally, the influence of FFA content on the catalytic activity was investigated. As a result, in the case of Fe3O4@SiO2-EDG, a higher tolerance towards the FFA content can be noticed with a FAME yield of over 90% (for a 5% (weight) vs oil catalyst content) and 5% weight FFA content.
format	article
author	Petre Chipurici Alexandru Vlaicu Ioan Călinescu Mircea Vînătoru Cristina Busuioc Adrian Dinescu Adi Ghebaur Edina Rusen Georgeta Voicu Maria Ignat Aurel Diacon
author_facet	Petre Chipurici Alexandru Vlaicu Ioan Călinescu Mircea Vînătoru Cristina Busuioc Adrian Dinescu Adi Ghebaur Edina Rusen Georgeta Voicu Maria Ignat Aurel Diacon
author_sort	Petre Chipurici
title	Magnetic silica particles functionalized with guanidine derivatives for microwave-assisted transesterification of waste oil
title_short	Magnetic silica particles functionalized with guanidine derivatives for microwave-assisted transesterification of waste oil
title_full	Magnetic silica particles functionalized with guanidine derivatives for microwave-assisted transesterification of waste oil
title_fullStr	Magnetic silica particles functionalized with guanidine derivatives for microwave-assisted transesterification of waste oil
title_full_unstemmed	Magnetic silica particles functionalized with guanidine derivatives for microwave-assisted transesterification of waste oil
title_sort	magnetic silica particles functionalized with guanidine derivatives for microwave-assisted transesterification of waste oil
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/84147a0173fa4b7a8319ad57b1059da8
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Magnetic silica particles functionalized with guanidine derivatives for microwave-assisted transesterification of waste oil

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