Oxidation of Levafix CA reactive azo-dyes in industrial wastewater of textile dyeing by electro-generated Fenton's reagent

El‐Desoky, Hanaa S.; Ghoneim, Mohammed M.; El-Sheikh, Ragaa; Zidan, Naglaa M.

doi:10.1016/j.jhazmat.2009.10.089

Cited by 131 publications

(60 citation statements)

References 45 publications

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“…Blue CA and Levafix Red CA reactive dyes can be removed from waste waters by anodically electro-generated Fenton's reagent using RVC as cathode [89]. The application of RVC anodes to soil remediation has been explored too.…”

Section: Oxidation Of Organicsmentioning

confidence: 99%

The continued development of reticulated vitreous carbon as a versatile electrode material: Structure, properties and applications

Walsh

Arenas

León

et al. 2016

Electrochimica Acta

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The limitations of 2-dimensional electrodes can be overcome by using threedimensional materials having sufficient porosity and active area while offering moderate mass transport rates and a relatively low pressure drop at controlled electrolyte flow rate. In concept, a wide variety of metal, ceramic and composite materials are possible but restrictions are imposed by the need to avoid materials degradation, while maintaining adequate electrical conductivity, sufficient robustness and the possibility of facile scale-up. Despite its fragility, one of the traditional electrode materials used as a porous, 3-dimensional electrode is carbon foam, particularly in the 97% vol. porous form of reticulated vitreous carbon, RVC. A timeline indicates that the history of this material dates back over 50 years to the mid1960s, when it was primarily used as an uncoated material in small-scale, laboratory electroanalysis. Surface modification and diverse coatings have considerably extended the use of RVC. Recent applications are found in sensors and monitors, electrosynthesis, environmental processing and energy conversion. This review highlights the fundamental structure and summarises the physicochemical properties of RVC. Fluid flow through various porosity grades of the material, their active electrochemical area and rates of mass transport are quantified. The diverse applications of RVC in energy conversion, environmental treatment and electrosynthesis are illustrated by selected examples from the authors' laboratories and others over the last 30 years. Recent research on coated RVC, energy conversion environmental remediation and sensors is highlighted. Critical areas deserving further research and development are proposed.

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Section: Oxidation Of Organicsmentioning

confidence: 99%

The continued development of reticulated vitreous carbon as a versatile electrode material: Structure, properties and applications

Walsh

Arenas

León

et al. 2016

Electrochimica Acta

View full text Add to dashboard Cite

show abstract

“…An oxonium ion makes hydrogen peroxide eletrophilic to enhance its stability and presumably to substantially reduce the reactivity with ferrous ion [22]. At pH values above 4, the precipitation of iron hydroxides inhibited both the regeneration of the active specie Fe 2+ and the formation of hydroxyl radicals [23].…”

Section: Three-dimensional (3d) Response Surface Plot For Cod Removalmentioning

confidence: 99%

Treatment of 3,4,5-trimethoxybenzaldehyde and Di-bromo-aldehyde manufacturing wastewater by the coupled Fenton pretreatment and UASB reactor with emphasis on optimization and chemicals analysis

Hong

Jin

et al. 2015

Separation and Purification Technology

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“…Dentro deste contexto, pode ser dado destaque a uma publicação recente, 15 que demonstra elevada eficiência do processo no tratamento de resíduos aquosos contendo corantes reativos do tipo azo.…”

Section: Estudo De Degradação De Resíduos De Tingimentounclassified

Degradação de corantes têxteis e remediação de resíduos de tingimento por processos Fenton, foto-Fenton e eletro-Fenton

Salvador¹,

Marcolino‐Júnior²,

Peralta‐Zamora³

2012

Quím. Nova

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Recebido em 28/6/11; aceito em 24/11/11; publicado na web em 23/1/12 DEGRADATION OF TEXTILE DYES AND REMEDIATION OF DYING RESIDUES BY FENTON, PHOTO-FENTON AND ELECTRO-FENTON PROCESSES. In this work the degradation of textile dyes were evaluated, using Fenton, photo-Fenton and electro-Fenton processes. Under optimized conditions Fenton and photo-Fenton processes showed high decolorization capacity of the model dyes. The electro-Fenton process was carried out in an undivided electrochemical reactor (1000 mL) equipped with a carbon-felt cathode (253 cm 2 ) and a platinum gauze anode (6 cm 2 ). Under optimal conditions (J: 1.6 mA cm -2 , Na 2 SO 4 : 0.075 mol L -1 , pH: 3) H 2 O 2 concentration of about 60 mg L -1 was observed. The addition of Fe 2+ (15 mg L -1 ) induces Fenton reactions that permit almost total decolorization of textile dyes.Keywords: textile dyes; degradation; electro-Fenton. INTRODUÇÃONas últimas décadas, o fenômeno da contaminação ambiental alcançou proporções globais, principalmente em função da continua emissão de inúmeros resíduos domésticos e industriais, os quais, quando não adequadamente tratados, apresentam um elevado potencial poluente.Dentro do contexto da atividade industrial é possível destacar operações de tingimento de fibras têxteis, processo este que é responsável pela geração de grandes volumes de resíduos líquidos, contendo elevada carga orgânica e forte coloração. 1 Nos últimos anos, inúmeros esforços têm sido dedicados à proposta de sistemas de tratamento que permitam a remoção de corantes têxteis, incluindo sistemas de nanofiltração, 2 processos de adsorção com sorbentes de diversa natureza, 3,4 sistemas biológicos fundamentados no uso de bactérias, 5 fungos 6 e enzimas 7 e, mais recentemente, sistemas de tratamento fundamentados em processos oxidativos avançados, como fotocatálise heterogênea 8 e processos Fenton. 9 Em função da usual resistência dos corantes têxteis frente a processos de natureza biológica e do caráter não destrutivo de muitas propostas de natureza física, os processos oxidativos avançados têm ganhado bastante destaque nos últimos anos, principalmente em razão da sua efetiva capacidade de degradação e mineralização de substratos sabidamente resistentes, incluindo corantes têxteis. 10 Dentro deste contexto, deve ser dado destaque aos processos do tipo Fenton, os quais têm se mostrado bastante promissores na degradação de corantes têxteis, basicamente em função da sua elevada eficiência de degradação e relativa simplicidade operacional. 11 Os principais fundamentos deste tipo de processo, assim como as suas principais vantagens e desvantagens, podem ser consultados em revisões nacionais e internacionais publicadas recentemente. 12,13 Dentre as principais dificuldades encontradas na aplicação de sistemas Fenton em grande escala é possível destacar o caráter crítico da concentração de peróxido de hidrogênio. Nos processos foto-Fenton (Equações 1-3), assistidos por radiação ultravioleta, visível ou solar, o processo de degradação se processa rapidamente, em funç...

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Oxidation of Levafix CA reactive azo-dyes in industrial wastewater of textile dyeing by electro-generated Fenton's reagent

Cited by 131 publications

References 45 publications

The continued development of reticulated vitreous carbon as a versatile electrode material: Structure, properties and applications

The continued development of reticulated vitreous carbon as a versatile electrode material: Structure, properties and applications

Treatment of 3,4,5-trimethoxybenzaldehyde and Di-bromo-aldehyde manufacturing wastewater by the coupled Fenton pretreatment and UASB reactor with emphasis on optimization and chemicals analysis

Degradação de corantes têxteis e remediação de resíduos de tingimento por processos Fenton, foto-Fenton e eletro-Fenton

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