Removal of imidazolium- and pyridinium-based ionic liquids by Fenton oxidation
Entity
UAM. Departamento de Química Física AplicadaPublisher
Springer Berlin HeidelbergDate
2018-01-09Citation
10.1007/s11356-017-0867-4
Environmental Science and Pollution Research 25.35 (2018): 34930-34937
ISSN
0944-1344 (print); 1614-7499 (online)DOI
10.1007/s11356-017-0867-4Funded by
The authors wish to thank the Spanish MINECO and Comunidad de Madrid for the financial support through the projects CTM2016-76564-R and S2013/MAE-2716, respectivelyProject
Gobierno de España. CTM2016-76564-R; Comunidad de Madrid. S2013/MAE-2716/REMTAVARESEditor's Version
https://doi.org/10.1007/s11356-017-0867-4Subjects
Degradation pathway; Ecotoxicity; Fenton oxidation; Imidazolium; Ionic liquids; Pyridinium; Física; QuímicaNote
This is peer-post-review, pre-copyedit version of an article published in Environmental Science and Pollution Research. The final authenticated version is avilable online at: https://doi.org/10.1007/s11356-017-0867-4Rights
© 2018 Springer-Verlag GmbH Germany, part of Springer NatureAbstract
The oxidation of imidazolium (1-hexyl-3-methylimidazolium chloride, HmimCl) and pyridinium (1-butyl-4-methylpyridinium chloride, BmpyrCl) ionic liquids (ILs) by Fenton’s reagent has been studied. Complete conversion was achieved for both ILs using the stoichiometric H2O2dose at 70 °C, reaching final TOC conversion values around 45 and 55% for HmimCl and BmpyrCl, respectively. The decrease in hydrogen peroxide dose to substoichiometric concentrations (20–80% stoichiometric dose) caused a decrease in TOC conversion and COD removal and the appearance of hydroxylated oxidation by-products. Working at these substoichiometric H2O2doses allowed the depiction of a possible degradation pathway for the oxidation of both imidazolium and pyridinium ILs. The first step of the oxidation process consisted in the hydroxylation of the ionic liquid by the attack of the ·OH radicals, followed by the ring-opening and the formation of short-chain organic acids, which could be partially oxidized up to CO2and H2O. At H2O2doses near stoichiometric values (80%), the resulting effluents showed non-ecotoxic behaviour and more biodegradable character (BOD5/COD ratio around 0.38 and 0.58 for HmimCl and BmpyrCl, respectively) due to the formation of short-chain organic acids. [Figure not available: see fulltext.]
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Google Scholar:Gomez-Herrero, Esther
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Tobajas Vizcaíno, Montserrat
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Polo Díez, Alicia Marta
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Rodriguez, Juan J.
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Fernández Mohedano, Ángel
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