Radiolytic degradation of 2-methylisoborneol and geosmin in water: Reactive radical species and transformation pathways

Water radiolysis can serve as a useful tool to study the degradation of organic pollutants in water. Manipulation of the radiolytic system enables the selective production of reactive species (RS) with known yields. Our aim was to explore the effects of the radiolytically produced RS on commonly occ...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	C. Christophoridis, C.J. Pestana, T. Kaloudis, L.A. Lawton, T.M. Triantis, A. Hiskia
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Water radiolysis Gamma irradiation Taste and odor Transformation products Reactive species Degradation rate Chemical engineering TP155-156
Acceso en línea:	https://doaj.org/article/6c91f000ca8a4d2482c7cd096c000890
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:6c91f000ca8a4d2482c7cd096c000890
record_format	dspace
spelling	oai:doaj.org-article:6c91f000ca8a4d2482c7cd096c0008902021-11-18T04:53:36ZRadiolytic degradation of 2-methylisoborneol and geosmin in water: Reactive radical species and transformation pathways2666-821110.1016/j.ceja.2021.100196https://doaj.org/article/6c91f000ca8a4d2482c7cd096c0008902021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666821121001113https://doaj.org/toc/2666-8211Water radiolysis can serve as a useful tool to study the degradation of organic pollutants in water. Manipulation of the radiolytic system enables the selective production of reactive species (RS) with known yields. Our aim was to explore the effects of the radiolytically produced RS on commonly occuring water taste and odor compounds (T&O), 2-methylisoborneol (MIB) and geosmin (GSM). Observed degradation rate constants differ among experimental conditions/dominant RS and follow the order: HO•>H•>>eaq−>(O2−•/HO2•), ranging from 0.002 Gy−1 (O2−•/HO2•) to 0.083 Gy−1 (HO•) for MIB and from 0.006 Gy−1 (O2−•/HO2•) to 0.068 Gy−1 (HO•) for GSM. Degradation by HO• was very efficient, requiring 1.14 and 1.49 μmoles of HO• for each degraded μmole of MIB and GSM, respectively. The oxidative degradation of MIB by HO• proceeds with the production of carbonyl- and hydroxyl‑containing transformation products (TPs), leading to linear structures, while for GSM degradation proceeds with ring opening, followed by formation of carboxyl-groups. Fewer TPs are produced by HO2•, while degradation with H• led to numerous TPs, via dehydroxylation, dehydration and ring opening. Degradation with eaq−, yielded demethylated and rearranged TPs with formation of double bonds.C. ChristophoridisC.J. PestanaT. KaloudisL.A. LawtonT.M. TriantisA. HiskiaElsevierarticleWater radiolysisGamma irradiationTaste and odorTransformation productsReactive speciesDegradation rateChemical engineeringTP155-156ENChemical Engineering Journal Advances, Vol 8, Iss , Pp 100196- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Water radiolysis Gamma irradiation Taste and odor Transformation products Reactive species Degradation rate Chemical engineering TP155-156
spellingShingle	Water radiolysis Gamma irradiation Taste and odor Transformation products Reactive species Degradation rate Chemical engineering TP155-156 C. Christophoridis C.J. Pestana T. Kaloudis L.A. Lawton T.M. Triantis A. Hiskia Radiolytic degradation of 2-methylisoborneol and geosmin in water: Reactive radical species and transformation pathways
description	Water radiolysis can serve as a useful tool to study the degradation of organic pollutants in water. Manipulation of the radiolytic system enables the selective production of reactive species (RS) with known yields. Our aim was to explore the effects of the radiolytically produced RS on commonly occuring water taste and odor compounds (T&O), 2-methylisoborneol (MIB) and geosmin (GSM). Observed degradation rate constants differ among experimental conditions/dominant RS and follow the order: HO•>H•>>eaq−>(O2−•/HO2•), ranging from 0.002 Gy−1 (O2−•/HO2•) to 0.083 Gy−1 (HO•) for MIB and from 0.006 Gy−1 (O2−•/HO2•) to 0.068 Gy−1 (HO•) for GSM. Degradation by HO• was very efficient, requiring 1.14 and 1.49 μmoles of HO• for each degraded μmole of MIB and GSM, respectively. The oxidative degradation of MIB by HO• proceeds with the production of carbonyl- and hydroxyl‑containing transformation products (TPs), leading to linear structures, while for GSM degradation proceeds with ring opening, followed by formation of carboxyl-groups. Fewer TPs are produced by HO2•, while degradation with H• led to numerous TPs, via dehydroxylation, dehydration and ring opening. Degradation with eaq−, yielded demethylated and rearranged TPs with formation of double bonds.
format	article
author	C. Christophoridis C.J. Pestana T. Kaloudis L.A. Lawton T.M. Triantis A. Hiskia
author_facet	C. Christophoridis C.J. Pestana T. Kaloudis L.A. Lawton T.M. Triantis A. Hiskia
author_sort	C. Christophoridis
title	Radiolytic degradation of 2-methylisoborneol and geosmin in water: Reactive radical species and transformation pathways
title_short	Radiolytic degradation of 2-methylisoborneol and geosmin in water: Reactive radical species and transformation pathways
title_full	Radiolytic degradation of 2-methylisoborneol and geosmin in water: Reactive radical species and transformation pathways
title_fullStr	Radiolytic degradation of 2-methylisoborneol and geosmin in water: Reactive radical species and transformation pathways
title_full_unstemmed	Radiolytic degradation of 2-methylisoborneol and geosmin in water: Reactive radical species and transformation pathways
title_sort	radiolytic degradation of 2-methylisoborneol and geosmin in water: reactive radical species and transformation pathways
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/6c91f000ca8a4d2482c7cd096c000890
work_keys_str_mv	AT cchristophoridis radiolyticdegradationof2methylisoborneolandgeosmininwaterreactiveradicalspeciesandtransformationpathways AT cjpestana radiolyticdegradationof2methylisoborneolandgeosmininwaterreactiveradicalspeciesandtransformationpathways AT tkaloudis radiolyticdegradationof2methylisoborneolandgeosmininwaterreactiveradicalspeciesandtransformationpathways AT lalawton radiolyticdegradationof2methylisoborneolandgeosmininwaterreactiveradicalspeciesandtransformationpathways AT tmtriantis radiolyticdegradationof2methylisoborneolandgeosmininwaterreactiveradicalspeciesandtransformationpathways AT ahiskia radiolyticdegradationof2methylisoborneolandgeosmininwaterreactiveradicalspeciesandtransformationpathways
_version_	1718424917087617024

Radiolytic degradation of 2-methylisoborneol and geosmin in water: Reactive radical species and transformation pathways

Ejemplares similares