Ionic liquids breakdown by Fenton oxidation

Abstract

Esta es la versión de autor del artículo publicado en: This is an author produced version of a paper published in: Upon Fenton oxidation of the four ILs tested hydroxylated compounds of higher molecular weight than the starting ILs, fragments of ILs partially oxidized and short-chain organic acids were identified as reaction by-products. Reaction pathways are proposed.2

Role of the chemical structure of ionic liquids in their ecotoxicity and reactivity towards Fenton oxidation

“…Although the viability of the process has been demonstrated, since the complete conversion of the IL Fenton oxidation under the operating conditions previously reported [21,22] and the ecotoxicity of the non-treated and treated effluent. The evolution of the chemical oxygen demand (COD), Total Organic Carbon (TOC), the type of acids formed and the toxicity of the Fenton oxidation effluents towards the Vibrio fischeri marine luminescent bacteria, upon oxidation were evaluated.…”

Photochemistry of imidazolium cations. Water addition to methylimidazolium ring induced by UV radiation in aqueous solution

“…The chemical nature of the degradation products is also relevant in order to evaluate if these compounds are environmentally friendlier than their precursors. Siedlecka et al [16] and more recently Muñoz et al [17] showed that the main degradation products of methylimidazolium cations in aqueous solutions under Fenton oxidation are imidazolones. On the other hand, Czerwicka et al [18] showed that the photochemical treatment of methylimidazolium cations in solution with UV/H 2 O 2 yields main degradation products with two hydroxyl groups at the imidazolium ring.…”

Degradation of imidazolium-based ionic liquids by catalytic wet peroxide oxidation with carbon and magnetic iron catalysts

“…Among them, Fenton oxidation is receiving growing attention and has been successfully applied . In recent contributions, we reported complete disappearance of imidazolium‐based ILs ([IL] 0 = 1000 mg L −1 ) and more than 50% mineralization under optimum operating conditions ([Fe 3+ ] = 50 mg L −1 ; stoichiometric dose of H 2 O 2 ; 70–90 °C). Non‐toxic effluents were obtained after 4 h treatment.…”