NickelMaghrebV1, Main, Exploration, bibRecord, 000289

Decoloration of Orange G (OG) using electrochemical reduction

Identifieur interne : 000289 ( Main/Exploration ); précédent : 000288; suivant : 000290

Decoloration of Orange G (OG) using electrochemical reduction

Auteurs : Aicha Khenifi [Algérie] ; Zohra Bouberka [Algérie] ; Houari Hamani [Algérie] ; Hocine Illikti [Algérie] ; Mostefa Kameche [Algérie] ; Zoubir Derriche [Algérie]

Source :

Environmental technology [ 0959-3330 ] ; 2012.

RBID : Pascal:12-0230315

Descripteurs français

Pascal (Inist)
- Décoloration, Réduction chimique, Réaction électrochimique, Electrocatalyse, Hydrogénation, Electrode, Particule fine, Nickel Raney, pH, Colorant azoïque, Densité, Ordre 1, Rendement courant, Eau usée industrielle, Industrie textile, Electrolyte, Epuration physicochimique, Aérosol, Pollution air.
Wicri :
- topic : Industrie textile, Aérosol.

English descriptors

KwdEn :
- Aerosols, Air pollution, Azo dye, Chemical reduction, Current efficiency, Density, Discoloration, Electrocatalysis, Electrochemical reaction, Electrodes, Electrolyte, Fine particle, First order, Hydrogenation, Industrial waste water, Physicochemical purification, Raney nickel, Textile industry, pH.

Abstract

The electrocatalytic hydrogenation of Orange G is investigated using spectrophotometric experiments in laboratory cells. The working electrode consists of a thin grid coated with a layer of nickel in which fine particles of Raney nickel are dispersed. The optimal conditions of decoloration are as follows: basic pH, 0.05 g/L of dye concentration and 0.05 A of current density. Under these conditions, the OG decoloration efficiency reached 100% after only 1800 s of reaction. The observed values of the maximum absorbance in the spectra of the reaction mixture fitted well the polynomials of the fifth degree with respect to reaction time. The initial degradation rate of the dye is obtained easily as the differential coefficient of the functions at initial time. The degradation rate of the dye in the initial stage of the reaction is given by the first-order rate equation. The instantaneous current efficiency was calculated and the results indicated that cathodic reduction was the main contributor to the decoloration of OG. Direct cathodic reduction of azo dyes allows decolorization of intensively coloured textile wastewater without addition of chemicals or formation of sludge. The technique is of particular interest for the treatment of concentrated dye baths. The effect of current density, dye concentration, and concentration and nature of the supporting electrolyte on the reduction of the Orange G are reported.

Affiliations:

Algérie

Links toward previous steps (curation, corpus...)

to stream PascalFrancis, to step Corpus: 000097
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to stream Main, to step Curation: 000289

Le document en format XML

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aerosols</term>
<term>Air pollution</term>
<term>Azo dye</term>
<term>Chemical reduction</term>
<term>Current efficiency</term>
<term>Density</term>
<term>Discoloration</term>
<term>Electrocatalysis</term>
<term>Electrochemical reaction</term>
<term>Electrodes</term>
<term>Electrolyte</term>
<term>Fine particle</term>
<term>First order</term>
<term>Hydrogenation</term>
<term>Industrial waste water</term>
<term>Physicochemical purification</term>
<term>Raney nickel</term>
<term>Textile industry</term>
<term>pH</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Décoloration</term>
<term>Réduction chimique</term>
<term>Réaction électrochimique</term>
<term>Electrocatalyse</term>
<term>Hydrogénation</term>
<term>Electrode</term>
<term>Particule fine</term>
<term>Nickel Raney</term>
<term>pH</term>
<term>Colorant azoïque</term>
<term>Densité</term>
<term>Ordre 1</term>
<term>Rendement courant</term>
<term>Eau usée industrielle</term>
<term>Industrie textile</term>
<term>Electrolyte</term>
<term>Epuration physicochimique</term>
<term>Aérosol</term>
<term>Pollution air</term>
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<front><div type="abstract" xml:lang="en">The electrocatalytic hydrogenation of Orange G is investigated using spectrophotometric experiments in laboratory cells. The working electrode consists of a thin grid coated with a layer of nickel in which fine particles of Raney nickel are dispersed. The optimal conditions of decoloration are as follows: basic pH, 0.05 g/L of dye concentration and 0.05 A of current density. Under these conditions, the OG decoloration efficiency reached 100% after only 1800 s of reaction. The observed values of the maximum absorbance in the spectra of the reaction mixture fitted well the polynomials of the fifth degree with respect to reaction time. The initial degradation rate of the dye is obtained easily as the differential coefficient of the functions at initial time. The degradation rate of the dye in the initial stage of the reaction is given by the first-order rate equation. The instantaneous current efficiency was calculated and the results indicated that cathodic reduction was the main contributor to the decoloration of OG. Direct cathodic reduction of azo dyes allows decolorization of intensively coloured textile wastewater without addition of chemicals or formation of sludge. The technique is of particular interest for the treatment of concentrated dye baths. The effect of current density, dye concentration, and concentration and nature of the supporting electrolyte on the reduction of the Orange G are reported.</div>
</front>
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<affiliations><list><country><li>Algérie</li>
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<tree><country name="Algérie"><noRegion><name sortKey="Khenifi, Aicha" sort="Khenifi, Aicha" uniqKey="Khenifi A" first="Aicha" last="Khenifi">Aicha Khenifi</name>
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<name sortKey="Bouberka, Zohra" sort="Bouberka, Zohra" uniqKey="Bouberka Z" first="Zohra" last="Bouberka">Zohra Bouberka</name>
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<name sortKey="Hamani, Houari" sort="Hamani, Houari" uniqKey="Hamani H" first="Houari" last="Hamani">Houari Hamani</name>
<name sortKey="Illikti, Hocine" sort="Illikti, Hocine" uniqKey="Illikti H" first="Hocine" last="Illikti">Hocine Illikti</name>
<name sortKey="Kameche, Mostefa" sort="Kameche, Mostefa" uniqKey="Kameche M" first="Mostefa" last="Kameche">Mostefa Kameche</name>
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Decoloration of Orange G (OG) using electrochemical reduction

Decoloration of Orange G (OG) using electrochemical reduction

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri