Decolorization Of Textile Dye Solutions

Carrière, Julie; Jones, J. Peter; Broadbent, Arthur D.

doi:10.1080/01919519308552483

Cited by 58 publications

(23 citation statements)

References 2 publications

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“…They include physicalchemical flocculation, electroflotation, membranefiltration, electrokinetic coagulation, ion-exchange, irradiation, precipitation and other treatment using activated carbon. 5 Over the past few years, alternative methods [6][7][8][9][10] for dye treatment have been investigated, including chemical oxidation with reagents such as: ozone, hydrogen peroxide, ozone/UV, hydrogen peroxide/UV and Fenton's reagent [hydrogen peroxide + Fe (II)]. The application of electrochemical oxidation with or without UV light as method for dye degradation have also been investigated, [11][12][13][14][15] but no mechanisms of the reduction were discussed.…”

Section: Introductionmentioning

confidence: 99%

Decolourization of anthraquinone reactive dye by electrochemical reduction on reticulated glassy carbon electrode

Carneiro

Boralle

Stradiotto

et al. 2004

J. Braz. Chem. Soc.

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A remoção do corante reativo Reactive Blue 4 (RB4) por redução eletroquímica em solução aquosa foi investigada sobre eletrodo de carbono vítreo reticulado. O grupo antraquinona presente no corante RB4 é reduzido em pH < 8,0 em uma única etapa a hidroquinona, segundo um processo reversível de dois elétrons e reação de pré-protonação, via geração de um radical semiquinona detectado espectrotométricamente. Em pH > 8,0, ambas as formas não e pré-protonada da antraquinona são reduzidas em duas etapas reversíveis de dois elétrons. Após 3 horas de eletrólise em meio ácido e neutro o corante perde 60% de sua coloração, enquanto que em meio alcalino perde apenas 37%. Simultaneamente, 64% de remoção de carbono orgânico total foi obtida após eletrólise em meio ácido de pH 2,0.The electrochemistry reduction for the removal of Reactive Blue 4 (RB4) dye from aqueous solution using reticulated glassy carbon electrode is investigated. At pH < 8.0 the anthraquinone group of the RB4 dye are reduced in one cathodic step to hidroquinone after a reversible two-electron process involving a precedent two protons reaction. A stable semiquinone is detected by spectrophotometric technique. At pH > 8.0 the reduction process involves two reversible 2-electron steps, whose species are generated by a protonation equilibrium of anthraquinone group. The results shows that 60% of color removal was obtained after 3 hours of RB4 dye electrolysis at acidic and neutral conditions and only 37% at alkaline conditions. Simultaneously 64% of total organic carbon was removed after electrolysis at pH 2.0.Keywords: reactive dyes, electrochemical reduction, dye treatment, reactive blue 4 IntroductionReactive dyes are the main group of dyes used in the textile industry.1 They are very effective in fabric dyeing due to the reactive groups capable of forming covalent bonds with a hydroxyl or amino group on the fiber. Inefficiencies in the dyeing process results in 10-15% of all dyestuff being lost directly to wastewater.2 Therefore, their crescent world consumption has attracted the critical attention of the public and the authorities with respect to the toxicological and environmental aspects of the reactive dyes. 3,4 Dye wastewater is usually treated by physical or chemical treatment process. They include physicalchemical flocculation, electroflotation, membranefiltration, electrokinetic coagulation, ion-exchange, irradiation, precipitation and other treatment using activated carbon. 5 Over the past few years, alternative methods 6-10 for dye treatment have been investigated, including chemical oxidation with reagents such as: ozone, hydrogen peroxide, ozone/UV, hydrogen peroxide/UV and Fenton's reagent [hydrogen peroxide + Fe (II)]. The application of electrochemical oxidation with or without UV light as method for dye degradation have also been investigated, [11][12][13][14][15] but no mechanisms of the reduction were discussed. [16][17][18][19] Most of the electrochemical studies involving reduction of reactive dyes are based on mercury electrode [16][17...

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Section: Introductionmentioning

confidence: 99%

Decolourization of anthraquinone reactive dye by electrochemical reduction on reticulated glassy carbon electrode

Carneiro

Boralle

Stradiotto

et al. 2004

J. Braz. Chem. Soc.

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“…Ozone specifically attacks the conjugated chains that impart color to the dye molecule (Horvath et al, 1985). It has been demonstrated that they have the ability to destroy dyestuffs (Saunders et al, 1983;Carrière et al, 1993). Ozonation of dyestuffs does not generate more biologically toxic chemicals (Gähr et al, 1994) and indeed, biodegradation appears by ozonation of wastes (Sevimli, 2002;Perkowski et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

A New Approach to Determine the Practical Ozone Dose for Color Removal from Textile Wastewater

Sevimli¹,

Sarikaya

Yazgan

2003

Ozone: Science & Engineering

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In this study, the effect of applied ozone dose and pH on color removal from textile wastewater was studied. A lab-scale ozonation system was used in the experiments. When the applied ozone dose increased, the color removal efficiency and the rate constants increased, whereas ozone utilization ratio decreased. On the other hand, increasing the pH increased color removal efficiency and ozone consumption but decreased specific ozone dose. By using the experimental results, a new model has been developed to determine the required ozone dose for the removal of color. By means of this method, it was possible to determine the required ozone dose for reducing the amount of color up to desired levels. Experimental results and the model predictions were in good agreement not only for textile wastewater but also for different industrial effluents. Some parameters affecting ozone utilization such as pH, could also be incorporated into the model.

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“…Dye solutions were prepared with de-ionised water, and after adjusting the pH to the required value with diluted H 2 SO 4 . After ozonation the treated solutions were transferred to glass bottles, the solution decanted after 2 h, and their absorbance measured.…”

Section: Fenton-like Oxidation Alone and Combined With Ozonationmentioning

confidence: 99%

Decolourisation of aqueous dyes by sequential oxidation treatment with ozone and Fenton's reagent

Hassan¹,

Hawkyard²

2002

J of Chemical Tech & Biotech

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Combined oxidation with ozone and Fenton's reagent (`Fentozone' process) for decolourisation of aqueous dyes was studied and compared with traditional Fenton's reagent. Although thè Fentozone' process was found to be effective at a wide range of pH values, the maximum colour removal was achieved at pH 4. The effect of pre-ozonation on colour removal ef®ciency of aqueous dyestuffs in the subsequent treatment with Fenton's reagent was investigated. The reaction kinetics using water-soluble acid and reactive dyes were also studied. Our experimental results show that preozonation can considerably accelerate decomposition of dyestuffs in the subsequent treatment with Fenton's reagent. Different concentrations of ferrous sulfate were used to investigate their in¯uences on the removal of colour. The rate of reaction increased with increasing doses of ferrous sulfate.

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Decolorization Of Textile Dye Solutions

Cited by 58 publications

References 2 publications

Decolourization of anthraquinone reactive dye by electrochemical reduction on reticulated glassy carbon electrode

Decolourization of anthraquinone reactive dye by electrochemical reduction on reticulated glassy carbon electrode

A New Approach to Determine the Practical Ozone Dose for Color Removal from Textile Wastewater

Decolourisation of aqueous dyes by sequential oxidation treatment with ozone and Fenton's reagent

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