Reduction of the Structural Iron in Montmorillonite by Electron Transfer from Catechol and its Derivatives

The structural Fe(III) in montmorillonite (MMT) clay has been reduced using catechol and its derivatives. It was found that the reduction process is pH-dependent and also depends on the ring substituents. If the catecholic ring has electron-donating substituents, reduction happens at high pH; if the...

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Autores principales:	Jasim HASSEN, Jack SILVER
Formato:	article
Lenguaje:	EN
Publicado:	Turkish Chemical Society 2021
Materias:	catechol montmorillonite reduction electron transfer Chemistry QD1-999
Acceso en línea:	https://doi.org/10.18596/jotcsa.908713 https://doaj.org/article/dcb8e3aceb224f2c8217547f4b3a37fb
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spelling	oai:doaj.org-article:dcb8e3aceb224f2c8217547f4b3a37fb2021-11-20T09:54:02Z Reduction of the Structural Iron in Montmorillonite by Electron Transfer from Catechol and its Derivatives https://doi.org/10.18596/jotcsa.9087132149-0120https://doaj.org/article/dcb8e3aceb224f2c8217547f4b3a37fb2021-11-01T00:00:00Zhttps://dergipark.org.tr/tr/pub/jotcsa/issue/64621/908713https://doaj.org/toc/2149-0120The structural Fe(III) in montmorillonite (MMT) clay has been reduced using catechol and its derivatives. It was found that the reduction process is pH-dependent and also depends on the ring substituents. If the catecholic ring has electron-donating substituents, reduction happens at high pH; if the catecholic ring has electron-withdrawing substituents, no reduction occurs. The process involves electron transfer from the hydroxy groups on the compounds to the active site at the iron atoms within the MMT lattice. This site acts as an electron acceptor (Lewis acid). Heat treatment of the reduced sample at 100-300 oC showed an enhancement of the Fe2+/Fe3+ ratio, which is attributed to an increase in the proportion of radicalic formation induced by dehydration. The MMT sample was added to the solutions of the catecholic compound and the slurries were stirred for 24 hours in order to reach equilibrium, then filtered, washed, and air-dried. The reactions were monitored using Mössbauer spectroscopy, x-ray powder diffraction, differential thermal analysis, electron spin resonance, infrared, and total surface area determination.Jasim HASSENJack SILVERTurkish Chemical Societyarticlecatecholmontmorillonitereductionelectron transferChemistryQD1-999ENJournal of the Turkish Chemical Society, Section A: Chemistry, Vol 8, Iss 4, Pp 1167 -1178 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	catechol montmorillonite reduction electron transfer Chemistry QD1-999
spellingShingle	catechol montmorillonite reduction electron transfer Chemistry QD1-999 Jasim HASSEN Jack SILVER Reduction of the Structural Iron in Montmorillonite by Electron Transfer from Catechol and its Derivatives
description	The structural Fe(III) in montmorillonite (MMT) clay has been reduced using catechol and its derivatives. It was found that the reduction process is pH-dependent and also depends on the ring substituents. If the catecholic ring has electron-donating substituents, reduction happens at high pH; if the catecholic ring has electron-withdrawing substituents, no reduction occurs. The process involves electron transfer from the hydroxy groups on the compounds to the active site at the iron atoms within the MMT lattice. This site acts as an electron acceptor (Lewis acid). Heat treatment of the reduced sample at 100-300 oC showed an enhancement of the Fe2+/Fe3+ ratio, which is attributed to an increase in the proportion of radicalic formation induced by dehydration. The MMT sample was added to the solutions of the catecholic compound and the slurries were stirred for 24 hours in order to reach equilibrium, then filtered, washed, and air-dried. The reactions were monitored using Mössbauer spectroscopy, x-ray powder diffraction, differential thermal analysis, electron spin resonance, infrared, and total surface area determination.
format	article
author	Jasim HASSEN Jack SILVER
author_facet	Jasim HASSEN Jack SILVER
author_sort	Jasim HASSEN
title	Reduction of the Structural Iron in Montmorillonite by Electron Transfer from Catechol and its Derivatives
title_short	Reduction of the Structural Iron in Montmorillonite by Electron Transfer from Catechol and its Derivatives
title_full	Reduction of the Structural Iron in Montmorillonite by Electron Transfer from Catechol and its Derivatives
title_fullStr	Reduction of the Structural Iron in Montmorillonite by Electron Transfer from Catechol and its Derivatives
title_full_unstemmed	Reduction of the Structural Iron in Montmorillonite by Electron Transfer from Catechol and its Derivatives
title_sort	reduction of the structural iron in montmorillonite by electron transfer from catechol and its derivatives
publisher	Turkish Chemical Society
publishDate	2021
url	https://doi.org/10.18596/jotcsa.908713 https://doaj.org/article/dcb8e3aceb224f2c8217547f4b3a37fb
work_keys_str_mv	AT jasimhassen reductionofthestructuralironinmontmorillonitebyelectrontransferfromcatecholanditsderivatives AT jacksilver reductionofthestructuralironinmontmorillonitebyelectrontransferfromcatecholanditsderivatives
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Reduction of the Structural Iron in Montmorillonite by Electron Transfer from Catechol and its Derivatives

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