Theoretical and experimental study of the influence of cation–Eriochrome complexes on the BDD anodic oxidation of Eriochrome Black T solutions

Silva, Ámison Rick Lopes da; Santos, Alexsandro J. dos; Santos, Enilson Medeiros dos; Silva, Djalma Ribeiro da; Martínez‐Huitle, Carlos A.

doi:10.1016/j.elecom.2020.106668

Cited by 13 publications

(6 citation statements)

References 40 publications

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“…2016; Javanbakht and Shafiei 2019; da Silva et al . 2020). Previous studies also reveal the decolourization of trypan blue using electrochemical oxidation (Ghime and Ghosh 2020).…”

Section: Discussionmentioning

confidence: 99%

Elucidation of fungal dye‐decolourizing peroxidase (DyP) and ligninolytic enzyme activities in decolourization and mineralization of azo dyes

Rajhans

Sen²,

Barik

et al. 2020

J Appl Microbiol

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Aim The aim of the study is to investigate the efficiency of Geotrichum candidum in the decolourization and mineralization of synthetic azo dyes. Methods and Results It includes screening of enzymes from G. candidum and its optimization, followed by decolourization and mineralization studies. Decolourization was observed to be maximum in methyl orange (94·6%) followed by Congo red (85%), trypan blue (70·4%) and Eriochrome Black T (55·6%) in 48 h, suggesting the plausible degradation of the azo dyes by G. candidum. The enzyme activity study showed that DyP‐type peroxidase has highest activity of 900 mU ml−1 compared to that of laccase (405 mU ml−1) and lignin peroxidase (LiP) (324 mU ml−1) at optimized pH (6) and temperature (35°C). Moreover, the rate of decolourization was found to be directly proportional to the production of laccase and LiP, unlike DyP‐type peroxidase. Furthermore, mineralization study demonstrated reduction in aromatic amines, showing 20% mineralization of methyl orange. Conclusion Geotrichum candidum with its enzyme system is able to efficiently decolourize and mineralize the experimental azo dyes. Significance and Impact of the Study The efficient decolourization and mineralization of azo dyes makes G. candidum a promising alternative in the treatment of textile effluent contaminated with azo dyes.

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“…2016; Javanbakht and Shafiei 2019; da Silva et al . 2020). Previous studies also reveal the decolourization of trypan blue using electrochemical oxidation (Ghime and Ghosh 2020).…”

Section: Discussionmentioning

confidence: 99%

Elucidation of fungal dye‐decolourizing peroxidase (DyP) and ligninolytic enzyme activities in decolourization and mineralization of azo dyes

Rajhans

Sen²,

Barik

et al. 2020

J Appl Microbiol

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“…These behaviors are in agreement with the electrochemical measurements and theoretical calculations. Nevertheless, it is possible to infer that there are differences between electrochemical measurements, theoretical calculations, and the mineralization results obtained in bulk electrolysis [49]. This behavior could be related to the structural differences between the reactive dyes and the oxidation mechanism at anode surface or in the chain reaction.…”

Section: Theoretical Chemistry Study: Dftmentioning

confidence: 96%

“…Meanwhile, direct and indirect oxidation mechanisms could be attained at BDD surface; however, this electrode has good interactions with the organic compounds and the mediated approach is mainly favored. Therefore, the process of mineralization is better at BDD than that achieved at Ti/Pt electrode (from bulk electrolysis point of view), which is mainly due to the production of oxidizing species, such as • OH radicals and persulfate [42][43][44]; even when the reactive dyes have direct interaction with BDD surface at lower potentials, these interactions between BDD and dyes are due to the electrochemical activity and chemical affinity [49]. These behaviors are in agreement with the electrochemical measurements and theoretical calculations.…”

Section: Theoretical Chemistry Study: Dftmentioning

confidence: 99%

Understanding the electrochemical oxidation of dyes on platinum and boron–doped diamond electrode surfaces: experimental and computational study

Soares

Silva

Santos

et al. 2020

J Solid State Electrochem

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Anodic oxidation (AO) approach proceeds via direct and indirect electrochemical pathways and their subsequent reactions. The interest to elucidate the mechanisms for removing dyes from water contributes to the understanding of more complex reactions involving organic pollutants towards anode surfaces. The present study was motivated by the reports that promote the use of AO for removing different organic compounds but no considerations about the influence of different functional groups in their structure have been discussed. Therefore, we have evaluated the influence of different functional groups in the dye structure (Reactive Orange 16, Reactive Violet 4, Reactive Red 228, and Reactive Black 5) by potentiodynamic measurements and by computational analyzes using density functional theory (DFT). The computational studies have allowed to carry out morphological studies on the frontier orbitals where the electrons are more energetic and then, the electron-transfer to electrode surface is achieved, which was associated to the electrochemical measurements (current-potential profiles). Also, the theoretical studies were used to understand the bulk electrolysis, in terms of mineralization. The results clearly demonstrate that organic molecules can be degraded in different way and level due to the oxidants electrochemically generated as well as the interaction of dyes with anode surface by adsorbed/non-adsorbed intermediates. Conversely, the decolorization mechanisms, which are related to the fragmentation of chromophore group, are associated to the direct AO approach, favoring different order of elimination, as already reported in our previous work. The results were discussed in light of the existing literature.

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“…For example, porous carbon materials are preferentially used for electro-Fenton system for their ability to electrogenerate more H2O2 and to promote the subsequent Fenton reaction. Only few previous studies investigated the influence of water hardness on electro-Fenton efficiency [72,73]. They attributed the decrease of organic pollutant removal to the formation of complexes with calcium and magnesium in the bulk.…”

Section: Electro-precipitation On Stainless Steel and Graphite At Dif...mentioning

confidence: 99%

Roles of H2 evolution overpotential, materials porosity and cathode potential on mineral electro-precipitation in microfluidic reactor – New criterion to predict and assess interdependency

Adnan

Pontvianne

Pons

et al. 2022

Electrochimica Acta

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Theoretical and experimental study of the influence of cation–Eriochrome complexes on the BDD anodic oxidation of Eriochrome Black T solutions

Cited by 13 publications

References 40 publications

Elucidation of fungal dye‐decolourizing peroxidase (DyP) and ligninolytic enzyme activities in decolourization and mineralization of azo dyes

Elucidation of fungal dye‐decolourizing peroxidase (DyP) and ligninolytic enzyme activities in decolourization and mineralization of azo dyes

Understanding the electrochemical oxidation of dyes on platinum and boron–doped diamond electrode surfaces: experimental and computational study

Roles of H2 evolution overpotential, materials porosity and cathode potential on mineral electro-precipitation in microfluidic reactor – New criterion to predict and assess interdependency

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