Experimental study and mathematical modeling of the electrochemical degradation of dyeing wastewaters in presence of chloride ion with dimensional stable anodes (DSA) of expanded meshes in a FM01-LC reactor

Cruz-Díaz, Martín R.; Rivero, Eligio P.; Rodríguez, Francisca A.; Domínguez-Bautista, Rosario

doi:10.1016/j.electacta.2017.12.025

Cited by 66 publications

(23 citation statements)

References 32 publications

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“…This implies that mass transfer control is expected at low concentration of the organic, being the maximum rate of the process directly proportional to the concentration of the target pollutant [30]. Moreover, it is well assumed that the kinetics of the mediated oxidation of an organic molecule by the active chlorine species electrochemically produced follows a pseudo-first order kinetics with respect to the pollutant concentration, once the concentration of the oxidant reaches a stationary value [31][32][33]. This implies a higher degradation rate for higher concentration of the pollutant, not only at the nearness of the electrode but also in the bulk.…”

Section: Of Eo)mentioning

confidence: 99%

Exploring the applicability of a combined electrodialysis/electro-oxidation cell for the degradation of 2,4-dichlorophenoxyacetic acid

Llanos

Raschitor

Cañizares

et al. 2018

Electrochimica Acta

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The improvement in the treatment efficiency of diluted effluents is one of the great challenges faced by electrochemical technology nowadays. In the present work, it is aimed to develop an electrochemical cell for the simultaneous concentration and degradation of ionic organic pollutants. This combined cell (so called EDEO device) integrates the concentration of the organic by electrodialysis (ED) with its electrooxidation (EO). For the particular case of the 2,4-dichlorophenoxyacetic acid (2,4-D), the performance of the cell has been tested with two anode materials (boron-doped diamond, BDD and mixed mineral oxides, MMO) and with two supporting electrolytes in order to explore four combinations that are expected to cover a wide range of possible actual scenarios. Results demonstrate that the combined EDEO process exhibits a degradation rate and a mineralization current efficiency markedly higher than the equivalent EO device when working with MMO anodes, either with NaCl or with Na2SO4. It was checked that the use of a BDD anode clearly increases the efficiency and the rate of the treatment due to the formation of strong oxidants. In this case, the effect of working with the combined EDEO in the rate of 2,4-D degradation is negligible because the 2,4-D transport rate becomes comparable to the degradation rate, being the combined process unable to generate a concentration greater than that accounted in the single EO device.

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Section: Of Eo)mentioning

confidence: 99%

Exploring the applicability of a combined electrodialysis/electro-oxidation cell for the degradation of 2,4-dichlorophenoxyacetic acid

Llanos

Raschitor

Cañizares

et al. 2018

Electrochimica Acta

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“…This may be due to the large volume of the electrolyte (300 cm 3 ) in comparison to the small electrode area (1 cm 2 ) employed. Otherwise, km values shown in Table 1 are one order of magnitude higher than those values found in literature, 0.001 m h -1 [72] and 0.015 m h -1 [73], for the removal of organic dyes by electrochemical oxidation processes. Finally, Fig.…”

Section: Time / Minmentioning

confidence: 56%

Removal of methylene blue from aqueous solutions using an Fe2+ catalyst and in-situ H2O2 generated at gas diffusion cathodes

Lacasa

Cañizares

Walsh

et al. 2019

Electrochimica Acta

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Textile industries generate large volumes of wastewater containing organic dyes, which may be hazardous to the environment and human health. In this work, the oxidation of 100 mg dm-3 of methylene blue (MB) in aqueous solutions was studied using H2O2 (formed in-situ) at gas diffusion electrodes (GDEs) in the presence of 1 × 10-3 mol dm-3 Fe 2+ catalyst, to create hydroxyl radicals to facilitate Fenton oxidation. The influence of applied potential (-0.5 to-1.3 V vs. Ag/AgCl) at different oxygen flow rates to the GDE (0.15-0.45 cm 3 min-1) and different counter electrode materials (Pt mesh, Ni mesh, RVC) was investigated. MB was completely degraded to a residual concentration below the detection limit of 0.5 mg dm-3. The rate and degree of mineralisation were significantly influenced by the applied potential. A maximum mineralisation of 88.2% was achieved at-1.0 V vs. Ag/AgCl. The oxygen flow rate to the GDE did not influence the degradation of MB under the experimental conditions. The counter electrode material affected the degree of mineralisation in the order Pt mesh > reticulated vitreous carbon (RVC) > Ni mesh. The apparent first order rate decay constant for MB degradation and MB mineralisation was calculated to have a maximum value of 0.0182 min-1 for MB mineralisation at a potential of-1.0 V vs. Ag/AgCl.

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“…Moreover, the influence of the supporting electrolyte on the mineralization efficiency depends on the anode material selected: greater with chloride when using MMO but higher with sulphate with BDD. The higher mineralization efficiency of MMO when using chloride may be explained by the ability of these anodes to promote the formation of chlorine active species from chloride (Malpass et al, 2006;Neodo et al, 2012;Cruz-Díaz et al, 2018) following mainly the reactions expressed by Equations 1 to 3. Regarding BDD, the production and activation of persulphate, following Equation 4, explains the superior performance of this electrode when working with sulphate as working electrode (Matzek and Carter, 2016;Bu et al, 2017;Song et al, 2018).…”

Section: Degradation Of Clopyralid By Eo and Edeo Technologiesmentioning

confidence: 99%

Is it worth using the coupled electrodialysis/electro-oxidation system for the removal of pesticides? Process modelling and role of the pollutant

et al. 2020

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Experimental study and mathematical modeling of the electrochemical degradation of dyeing wastewaters in presence of chloride ion with dimensional stable anodes (DSA) of expanded meshes in a FM01-LC reactor

Cited by 66 publications

References 32 publications

Exploring the applicability of a combined electrodialysis/electro-oxidation cell for the degradation of 2,4-dichlorophenoxyacetic acid

Exploring the applicability of a combined electrodialysis/electro-oxidation cell for the degradation of 2,4-dichlorophenoxyacetic acid

Removal of methylene blue from aqueous solutions using an Fe2+ catalyst and in-situ H2O2 generated at gas diffusion cathodes

Is it worth using the coupled electrodialysis/electro-oxidation system for the removal of pesticides? Process modelling and role of the pollutant

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