Electro-Fenton decoloration of dyes in a continuous reactor: A promising technology in colored wastewater treatment

Rosales, Emílio; Pazos, Marta; Longo, María A.; Sanromán, M.A.

doi:10.1016/j.cej.2009.06.028

Cited by 154 publications

(70 citation statements)

References 26 publications

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“…In SPEF, H 2 O 2 is supplied to the effluent from the two-electron reduction of O 2 at a carbonaceous cathode by reaction (1) . Graphite (Rosales et al, 2009), carbon nanotubes (Khataee et al, 2013), activated carbon fiber (Wang et al, 2008), carbon sponge (Daneshvar et al, 2008), graphite felt (Panizza and Oturan, 2011), carbon felt (Özcan et al, 2009;Dirany et al, 2012;Oturan et al, 2012) and carbon-polytetrafluoroethylene (PTFE) gas (O 2 or air) diffusion (Boye et al, 2003;Ammar et al, 2006;Ruiz et al, 2011a;Thiam et al, 2014) are the most suitable cathodes.…”

Section: Introductionmentioning

confidence: 99%

Decolorization and mineralization of Allura Red AC azo dye by solar photoelectro-Fenton: Identification of intermediates

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Decolorization and mineralization of Allura Red AC azo dye by solar photoelectro-Fenton: Identification of intermediates

et al. 2015

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“…Thus, in EO-H 2 O 2 , an air-or pure O 2 -fed airtight or porous carbonaceous cathode is employed to electrogenerate H 2 O 2 as follows [24][25][26][27][28]:…”

Section: Introductionmentioning

confidence: 99%

Routes for the electrochemical degradation of the artificial food azo-colour Ponceau 4R by advanced oxidation processes

Thiam

Brillas

Garrido

et al. 2016

Applied Catalysis B: Environmental

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a b s t r a c tThe performance of three electrochemical advanced oxidation processes, namely electro-oxidation with electrogenerated H 2 O 2 (EO-H 2 O 2 ), electro-Fenton (EF) and photoelectro-Fenton (PEF) for the treatment of aqueous solutions of the food azo dye Ponceau 4R in an undivided cell with a BDD anode and an airdiffusion cathode was compared in terms of colour, dye concentration and total organic carbon (TOC) removals. PEF treatments in ultrapure water with Na 2 SO 4 were performed to assess the effect of current density, as well as supporting electrolyte and dye concentrations. At 100 mA cm −2 , solutions of 130 mL of 254 mg L −1 of the dye in 0.05 M Na 2 SO 4 became colourless and totally mineralized after 50 and 240 min, respectively, which can be explained by the synergistic action of BDD( • OH) at the anode surface and homogeneous • OH formed in the bulk from Fenton's reaction promoted in the presence of Fe 2+ catalyst. Furthermore, UVA photons induced the continuous Fe 2+ regeneration and photolytic decomposition of refractory intermediate complexes. In that aqueous matrix, the cleavage of the dye molecules proceeded through several reaction routes to yield N-containing and non-N-containing derivatives with one or two aromatic rings, short-chain aliphatic carboxylic acids and inorganic ions. Oxalic and oxamic acids and sulfate ions were accumulated at different rates in EO-H 2 O 2 , EF and PEF. The three methods allowed the progressive decontamination of Ponceau 4R solutions in a real water matrix even without the addition of electrolyte, although complete TOC abatement after 360 min at 33.3 mA cm −2 was only ensured by the iron-catalyzed PEF process.

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“…Carbonaceous cathodes like graphite [26], carbon or graphite felts [12,[26][27][28][29][30], activated carbon fiber [31], carbon sponge [32], carbon-polytetrafluoroethylene (PTFE) gas (O 2 or air) diffusion [11,15,[33][34][35][36], carbon nanotubes [37,38] and BDD [14,39,40] have shown a high efficiency for H 2 O 2 electrogeneration from the twoelectron reduction of injected O 2 from reaction (2):…”

Section: Introductionmentioning

confidence: 99%

“…The most common method is electro-Fenton (EF) [11,12,15,[26][27][28][29][30]32,35,36], where • OH is produced in the bulk from the reaction between generated H 2 O 2 and low amounts of added Fe 2+ ion by Fenton's reaction (4) with optimum pH 2.8:…”

Section: Introductionmentioning

confidence: 99%

Degradation of the azo dye Acid Red 1 by anodic oxidation and indirect electrochemical processes based on Fenton's reaction chemistry. Relationship between decolorization, mineralization and products

Florenza

Solano

Centellas

et al. 2014

Electrochimica Acta

142

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Electro-Fenton decoloration of dyes in a continuous reactor: A promising technology in colored wastewater treatment

Cited by 154 publications

References 26 publications

Decolorization and mineralization of Allura Red AC azo dye by solar photoelectro-Fenton: Identification of intermediates

Decolorization and mineralization of Allura Red AC azo dye by solar photoelectro-Fenton: Identification of intermediates

Routes for the electrochemical degradation of the artificial food azo-colour Ponceau 4R by advanced oxidation processes

Degradation of the azo dye Acid Red 1 by anodic oxidation and indirect electrochemical processes based on Fenton's reaction chemistry. Relationship between decolorization, mineralization and products

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