Facile crosslinking of poly(vinylpyrrolidone) by electro-oxidation with IrO2-based anode under potentiostatic conditions

Lanzalaco, Sonia; Sirés, Ignasi; Galia, Alessandro; Sabatino, Maria Antonietta; Dispenza, Clelia; Scialdone, Onofrio

doi:10.1007/s10800-018-1237-8

Cited by 22 publications

(15 citation statements)

References 42 publications

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“…These oxidized products can be subsequently removed by liquid-liquid extraction or adsorption techniques [21][22][23][24]. Simultaneously, ROS can also be produced from water electro-oxidation using anodes having different compositions, morphologies and structural properties [25][26][27][28]. ROS are then localized at an interface (e.g., electrode-solution, catalyst-solution).…”

Section: Several Articles Have Focused On Electrochemical Desulfurization (Ecds) As a Newmentioning

confidence: 99%

Electrochemical oxidation of dibenzothiophene compounds on BDD electrode in acetonitrile–water medium

Dávila

Lacalle-Bergeron

Gutiérrez³

et al. 2019

Journal of Electroanalytical Chemistry

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The electrochemical oxidation of dibenzothiophene and two derivatives, namely 4methyldibenzothiophene and 4,6-dimethyldibenzothiophene, was investigated either separately or as a mixture, on a BDD anode in a miscible acetonitrile (87.5% v/v)-water (12.5% v/v, 0.01 M NaNO 3) solution. Linear sweep voltammetry, cyclic voltammetry, chronoamperometry and bulk electrolysis under potentiostatic conditions suggested the probable occurrence of two pathways: direct electrochemical oxidation and indirect reaction with hydroxyl radicals and other reactive oxygen species formed at the BDD anode surface during water discharge. The products extracted upon electrolysis at 1.5 and 2.0 V vs. SCE were analyzed by Fourier-transform infrared spectroscopy, gas chromatography-mass spectrometry and ultra-high performance liquid chromatography coupled to electrospray ionization and quadrupole time-of-flight mass spectrometry (UHPLC-ESI-Q-TOF-MS). The main molecules identified were the corresponding sulfoxides or sulfones, depending on the applied anodic potential. Possible oxidation routes for the dibenzothiophene compounds are proposed.

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Section: Several Articles Have Focused On Electrochemical Desulfurization (Ecds) As a Newmentioning

confidence: 99%

Electrochemical oxidation of dibenzothiophene compounds on BDD electrode in acetonitrile–water medium

Dávila

Lacalle-Bergeron

Gutiérrez³

et al. 2019

Journal of Electroanalytical Chemistry

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“…In the most simple configuration of electrochemical AOPs, a cathode with ability to electrogenerate H2O2 is combined with boron-doped diamond (BDD) (Panizza and Cerisola, 2009;Martínez-Huitle et al, 2015;Clematis et al, 2017) or a dimensionally stable anode (DSA ® ) based on IrO2 (Scialdone et al, 2009;Lanzalaco et al, 2017Lanzalaco et al, , 2018 or RuO2 (Ribeiro and De Andrade, 2004;Xu et al, 2017). Such high oxidation power anode materials (M) allow the production of adsorbed M( • OH) via water oxidation, giving rise to the electro-oxidation (EO) process.…”

Section: Introductionmentioning

confidence: 99%

Expanding the application of photoelectro-Fenton treatment to urban wastewater using the Fe(III)-EDDS complex

Brillas

Centellas

et al. 2020

Water Research

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This work reports the first investigation on the use of EDDS as chelating agent in photoelectro-Fenton (PEF) treatment of water at near-neutral pH. As a case study, the removal of the antidepressant fluoxetine was optimized, using an electrochemical cell composed of an IrO2-based anode an air-diffusion cathode for in-situ H2O2 production. Electrolytic trials at constant current were made in ultrapure water with different electrolytes, as well as in urban wastewater (secondary effluent) at pH 7.2. PEF with Fe(III)-EDDS (1:1) complex as catalyst outperformed electro-Fenton and PEF processes with uncomplexed Fe(II) or Fe(III). This can be explained by: (i) the larger solubilization of iron ions during the trials, favoring the production of • OH from Fenton-like reactions between H2O2 and Fe(II)-EDDS or Fe(III)-EDDS, and (ii) the occurrence of Fe(II) regeneration from Fe(III)-EDDS photoreduction, which was more efficient than conventional photo-Fenton reaction with uncomplexed Fe(III). The greatest drug concentration decays were achieved at low pH, using only 0.10 mM Fe(III)-EDDS in a 1:1 molar ratio, although complete removal in wastewater was feasible only with 0.20 mM Fe(III)-EDDS due to the greater formation of • OH. The effect of the applied current and anode nature was rather insignificant. A progressive destruction of the catalytic complex was unveiled, whereupon the mineralization mainly progressed thanks to the action of • OH adsorbed on the anode surface. Despite the incomplete mineralization using BDD as the anode, a remarkable toxicity decrease was determined. Fluoxetine degradation yielded F − and NO3 − ions, along with several aromatic intermediates. These included two chloroorganics, as a result of the anodic oxidation of Cl − to active chlorine. A detailed mechanism for the Fe(III)-EDDS-catalyzed PEF treatment of fluoxetine in urban wastewater is finally proposed.

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“…The application of EO process, which requires relatively simple setups, induces the destruction of organics by adsorbed hydroxyl radical (M( • OH)) that is formed as O2 evolves during water oxidation at the anode M, as represented in reaction (2) (Martínez-Huitle et al 2015). Non-active anodes like boron-doped diamond (BDD) are optimum to generate very reactive and oxidizing (M( • OH)) because of their higher O2-evolution overpotential as compared to active anode materials like Pt and dimensionally stable anodes (DSA) (Steter et al 2016;Clematis et al 2017;Lanzalaco et al 2018;Ridruejo et al 2018). When EO is performed in a one-compartment cell and the cathode produces H2O2 via reaction (1), it is socalled EO with electrogenerated H2O2 (EO-H2O2).…”

Section: Introductionmentioning

confidence: 99%

Photoelectro-Fenton treatment of pesticide triclopyr at neutral pH using Fe(III)–EDDS under UVA light or sunlight

Soares

Oriol

et al. 2020

Environ Sci Pollut Res

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One of the main challenges of electrochemical Fenton-based processes is the treatment of organic pollutants at near-neutral pH. As a potential approach to this problem, this work addresses the use of a low content of soluble chelated metal catalyst, formed between Fe(III) and ethylenediamine-N,N'-disuccinic (EDDS) acid (1:1), to degrade the herbicide triclopyr in 0.050 M Na2SO4 solutions at pH 7.0 by photoelectro-Fenton with UVA light or sunlight (PEF and SPEF, respectively). Comparison with electro-Fenton treatments revealed the crucial role of the photo-Fenton-like reaction, since this promoted the production of soluble Fe(II) that enhanced the pesticide removal. Hydroxyl radicals formed at the anode surface and in the bulk were the main oxidants. A boron-doped diamond (BDD) anode yielded a greater mineralization than an IrO2-based one, at the expense of reduced cost-effectiveness. The effect of catalyst concentration and current density on the performance of PEF with BDD was examined. The PEF trials in 0.25 mM Na2SO4 + 0.35 mM NaCl medium showed a large influence of generated active chlorine as oxidant, being IrO2 more suitable than RuO2 and BDD.In SPEF with BDD, the higher light intensity from solar photons accelerated the removal of the catalyst and triclopyr, with small effect on mineralization. A plausible route for the herbicide degradation by Fe(III)-EDDS-catalyzed PEF and SPEF is finally proposed based on detected byproducts: three heteroaromatic and four linear N-aliphatic compounds, formamide and tartronic and oxamic acids.

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Facile crosslinking of poly(vinylpyrrolidone) by electro-oxidation with IrO2-based anode under potentiostatic conditions

Cited by 22 publications

References 42 publications

Electrochemical oxidation of dibenzothiophene compounds on BDD electrode in acetonitrile–water medium

Electrochemical oxidation of dibenzothiophene compounds on BDD electrode in acetonitrile–water medium

Expanding the application of photoelectro-Fenton treatment to urban wastewater using the Fe(III)-EDDS complex

Photoelectro-Fenton treatment of pesticide triclopyr at neutral pH using Fe(III)–EDDS under UVA light or sunlight

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