Decolorization and mineralization of Sunset Yellow FCF azo dye by anodic oxidation, electro-Fenton, UVA photoelectro-Fenton and solar photoelectro-Fenton processes

Moreira, Francisca C.; Garcia‐Segura, Sergi; Vilar, Vítor J.P.; Brillas, Enric

doi:10.1016/j.apcatb.2013.03.023

Cited by 184 publications

(118 citation statements)

References 52 publications

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“…As can be seen, after a poorly efficient early stage related to the aforementioned induction period, maximum MCE values of 55%, 29%, 21% and 18% were obtained after 90-120 min as current increased, whereupon the efficiency decayed due to the accumulation of by-products that were highly resistant to oxidation by BDD( • OH) and • OH and/or UVA photolysis. High current values are then preferred if time is the key parameter for applying the treatment, whereas such choice is detrimental in terms of energy consumption since parasitic reactions of BDD( • OH) and • OH are enhanced under such conditions, especially as the organic matter content diminishes [37][38][39][40][41][42].…”

Section: Electrochemical Degradation Of Solutions Of Ponceau 4r By Pementioning

confidence: 99%

“…A 80:20 (v/v) acetonitrile/water (2.4 mM butylamine) mixture at 0.2 mL min −1 was eluted as mobile phase. Generated carboxylic acids were detected by ion-exclusion HPLC as described elsewhere [40]. Electrolytic experiments were made in triplicate with a good reproducibility of all the data.…”

Section: Apparatus and Analytical Proceduresmentioning

confidence: 99%

“…Encouraging results have been obtained for the treatment of textile azo dyes by EAOPs with a BDD anode [36][37][38][39][40], and very recently we have even discussed the behaviour of two food azo dyes in such systems [41,42]. In the present work, aiming to gain more thorough knowledge about the fate of food azo-colours upon application of EAOPs, Ponceau 4R has been chosen as a model pollutant.…”

Section: Introductionmentioning

confidence: 96%

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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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Section: Electrochemical Degradation Of Solutions Of Ponceau 4r By Pementioning

confidence: 99%

Section: Apparatus and Analytical Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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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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“…cell (100 mA cm TOC was reduced by 94% (at 150 min) [198] Sulfanilamide (239 mg L TOC reduction of 70% (at 300 min) [202] 8 International Journal of Photoenergy photoelectro-Fenton is additionally enhanced by reactions (11) and (15) under the solar radiation. Garcia-Segura and collaborators [76] claimed that at current densities > 33.3 mA cm −2 , the removal rate of oxalic and oxamic acids was not improved because of the occurrence of parasitic reactions, such as nonorganic oxidizing reactions with hydroxyl radicals, which led to an efficiency, decrease at higher current densities.…”

Section: Bdd Ohmentioning

confidence: 99%

Recent Overview of Solar Photocatalysis and Solar Photo-Fenton Processes for Wastewater Treatment

Gutierrez-Mata

Velázquez-Martínez

Álvarez-Gallegos

et al. 2017

International Journal of Photoenergy

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This literature research, although not exhaustive, gives perspective to solar-driven photocatalysis, such as solar photo-Fenton and TiO 2 solar photocatalysis, reported in the literature for the degradation of aqueous organic pollutants. Parameters that influence the degradation and mineralization of organics like catalyst preparation, type and load of catalyst, catalyst phase, pH, applied potential, and type of organic pollutant are addressed. Such parameters may also affect the photoactivity of the catalysts used in the studied solar processes. Solar irradiation is a renewable, abundant, and pollution-free energy source for low-cost commercial applications. Therefore, these solar processes represent an environmentally friendly alternative mainly because the use of electricity can be decreased/avoided.

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“…3; and (iii) photodecarboxylation of complexes of Fe(III) with generated carboxylic acids allowing the regeneration of Fe 2+ as depicted in the general Eq. 4 (Ruiz et al 2011;Isarain-Chávez et al 2011;Moreira et al 2013;Garza-Campos et al 2014). It is also worth noting that BDD electrodes have several advantages over other electrode materials that include possessing (i) an inert character; (ii) weak adsorption; (iii) a high over-potential for oxygen evolution (which acts as a parasite reaction); and (iv) a high current efficiency (Marselli et al 2003).…”

mentioning

confidence: 98%

Discoloration and Organic Matter Removal from Coffee Wastewater by Electrochemical Advanced Oxidation Processes

Villanueva-Rodríguez

Bello-Mendoza

Wareham

et al. 2014

Water Air Soil Pollut

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The coffee agro-industry generates a large volume of wastewater that is notable for its high organic strength as well as its color content. Due to the seasonal nature of the harvest (3-4 months per year), this particular industrial waste needs a treatment method that is both reliable and fast (in terms of start-up time). As part of investigating a system capable of treating a coffee wastewater, this research evaluated four electrochemical advanced oxidation processes (EAOPs) using boron-doped diamond (BDD) electrodes. The processes were anodic oxidation (AO), anodic oxidation with electrogenerated H 2 O 2 (AO-H 2 O 2 ), electro-Fenton (EF), and photoelectro-Fenton (PEF). Experimental conditions were as follows: 40 mA cm −2 current density (all EAOPs), 0.3 mmol Fe 2+ L −1 (Fenton systems), 300 mL air min −1 (AO-H 2 O 2 , EF, PEF), and 500 μW cm −2 UV irradiation (photo-Fenton systems). The performance of the four EAOP treatment methods (in terms of color and organic carbon removal) was compared against two conventional chemical oxidation methods, namely, Fenton and photo-Fenton. The research indicated that the four EAOPs were better at removing color (89-93 %) and total organic carbon (TOC) (73-84 %) than the respective chemical Fenton (58 and 4.8 %) and photo-Fenton (61 and 7 %) methods. The trend in performance was as follows: AO-H 2 O 2 >AO>PEF≈EF. It appeared that the ferrous iron reagent formed a dark-colored complex with some coffee components, diminishing the effect of Fenton reactions. In addition, the dark color of the wastewater limited the effect of light in the UV-Fenton processes. Analysis showed that acceptable levels of Fe 2+ (0.3 mmol L −1 ) and energy (0.082-0.098 kWh g −1 TOC) were required by the EAOPs after 4-h treatment time. In conclusion, the use of electrochemical methods (equipped with BDD electrodes) seems a promising method for the effective treatment of coffee wastewaters.

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Decolorization and mineralization of Sunset Yellow FCF azo dye by anodic oxidation, electro-Fenton, UVA photoelectro-Fenton and solar photoelectro-Fenton processes

Cited by 184 publications

References 52 publications

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

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

Recent Overview of Solar Photocatalysis and Solar Photo-Fenton Processes for Wastewater Treatment

Discoloration and Organic Matter Removal from Coffee Wastewater by Electrochemical Advanced Oxidation Processes

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