Anodic oxidation, electro-Fenton and photoelectro-Fenton degradations of pyridinium- and imidazolium-based ionic liquids in waters using a BDD/air-diffusion cell

Garcia‐Segura, Sergi; Lima, Álvaro Silva; Cavalcanti, Eliane Bezerra; Brillas, Enric

doi:10.1016/j.electacta.2016.03.057

Cited by 55 publications

(20 citation statements)

References 47 publications

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“…As the H2O2 dose increase, compounds with different breaks in the alkyl-chain were also observed. In the last oxidation stages, the breakdown of the imidazolium and pyridinium ring took place, given rise to the formation of short chain organic acids, which could be oxidized to CO2 and H2O, final oxidation products along with oxidized nitrogen species (Garcia-Segura et al 2016) such as NO and NO2. Those short-chain organic acids, final oxidation products, were only detected at high reactant doses.…”

Section: Figmentioning

confidence: 99%

“…Several works revealed that Anodic Oxidation (AO) was an efficient process for the degradation of ILs, concluding that the mineralization rate decrease as the number of carbons in the side chain increase (Siedlecka et al 2012). AO, electro-Fenton and photoelectron-Fenton processes were compared by Garcia-Segura et al (2016) for the removal of pyridinium and imidazolium ILs. Among the AOP´s studies, UVA irradiation in photoelectro-Fenton was the most powerful treatment with total mineralization around 95% for both ILs.…”

Section: Introductionmentioning

confidence: 99%

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Removal of imidazolium- and pyridinium-based ionic liquids by Fenton oxidation

Gomez‐Herrero

Tobajas

Polo

et al. 2018

Environ Sci Pollut Res

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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 HO dose 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 HO doses 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 CO and HO. At HO doses near stoichiometric values (80%), the resulting effluents showed non-ecotoxic behaviour and more biodegradable character (BOD/COD ratio around 0.38 and 0.58 for HmimCl and BmpyrCl, respectively) due to the formation of short-chain organic acids. Graphical abstract ᅟ.

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Section: Figmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Removal of imidazolium- and pyridinium-based ionic liquids by Fenton oxidation

Gomez‐Herrero

Tobajas

Polo

et al. 2018

Environ Sci Pollut Res

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“…6, rather than those on the surface of BDD, played the preponderant role in the mineralization of the organic content. This can simply be explained by the absence of mass transport restrictions in homogeneous reactions ,. The AO‐BDD curve in Figure b (electrolysis in the absence of Fe 2+ ions) at the optimal EF current of 4.67 mA cm −2 shows the contribution of BDD( .…”

Section: Resultsmentioning

confidence: 97%

Near‐neutral Electro‐Fenton Treatment of Pharmaceutical Pollutants: Effect of Using a Triphosphate Ligand and BDD Electrode

et al. 2019

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In this work, a mixture of pharmaceutical pollutants was successfully treated by electro-Fenton (EF) at near-neutral pH using the inorganic ligand triphosphate (TPP). The effect of the ligand and the reactivity of its Fe complexes were thoroughly investigated under different conditions of TPP : Fe 2 + ratio, Fe 2 + and TPP concentrations, current density, and nature of the anode material (Ti/IrO 2 À RuO 2 and boron doped diamond, BDD). The mineralization of organics was mainly controlled by the EF reaction promoted by the continuous electrochemical formation of H 2 O 2 and regeneration of Fe 2 + (as Fe 2 + -TPP), while the main role of the ligand was to keep active Fe 2 + ions dissolved in solution to catalyze the Fenton's reaction at near-neutral pH. The results contrasted with previous works that reported the ability of Fe-TPP to enhance the oxidation performance of Fenton-like systems. Moreover, the remarkable oxidative properties of diamond electrodes enhanced the mineralization efficiency and TPP was not detrimental to oxidation with BDD. Finally, the degradation kinetics of all the compounds under investigation were determined, and a pathway for the antidepressant amitriptyline (ATTL) was proposed.* OH oxidation and thus, diminishing [a] Dr.

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“…Formerly, ILs were typically eliminated through Advanced Oxidation Processes (AOPs). Thus, ILs can be efficiently removed from water by Fenton oxidation, catalytic wet peroxide oxidation, electroxidation or photodegradation . Specifically, Munoz et al, 2015, studied the Fenton oxidation of the IL choline chloride (CholineCl) at an initial concentration of 1000 mg L −1 with a stoichiometric dose of H 2 O 2 and 50 mgFe 3+ L −1 at pH 3 at 70 °C; they obtained a very low mineralization rate in terms of TOC removal (36.1%) relative to ILs from other families such as EmimCl (65.3%) and BmpyCl (43.7%) under identical conditions .…”

Section: Introductionmentioning

confidence: 99%

Biological oxidation of choline‐based ionic liquids in sequencing batch reactors

Mena

Díaz

Rodrı́guez

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Ionic liquids (ILs) are salts consisting of an organic cation and an organic or inorganic anion that are potential use for organic synthesis, biomass conversion, gas absorption, polymerization, metal extraction and lubrication. We examined the biodegradability of choline chloride (CholineCl), choline acetate (CholineAc) and choline bis(trifluoromethylsulfonyl)imide (CholineNTf2) in a sequencing batch reactor (SBR) to assess the influence of the IL anion. RESULTS Following acclimation, activated sludge exhibited good activity, and high COD (80–90%) and TOC removal (75–85%) with initial concentrations of CholineCl and CholineAc over the range 0.25–15 mmol L–1. However, increased concentrations of CholineNTf2 in the reactor feed had an inhibitory effect on the sludge. An analysis of the reaction effluent revealed the presence of the main intermediates of choline degradation: ethanol, and methyl‐, dimethyl‐ and trimethylamine. The initial and final microbial communities of the sludge were characterized by pyrosequencing analysis, and the latter was found to consist mainly of Alfa‐, Beta‐ and Gamma‐proteobacteria. CONCLUSION Choline‐based ionic liquids can be efficiently removed in SBRs. Complete choline degradation (0.25–15 mmol L–1) was accomplished at a variable depletion rate depending on the particular IL anion (chloride, acetate or NTf2). © 2019 Society of Chemical Industry

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Anodic oxidation, electro-Fenton and photoelectro-Fenton degradations of pyridinium- and imidazolium-based ionic liquids in waters using a BDD/air-diffusion cell

Cited by 55 publications

References 47 publications

Removal of imidazolium- and pyridinium-based ionic liquids by Fenton oxidation

Removal of imidazolium- and pyridinium-based ionic liquids by Fenton oxidation

Near‐neutral Electro‐Fenton Treatment of Pharmaceutical Pollutants: Effect of Using a Triphosphate Ligand and BDD Electrode

Biological oxidation of choline‐based ionic liquids in sequencing batch reactors

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