Electrochemical oxidation of Acid Yellow 1 using diamond anode

Rodríguez, Juan F.; Rodrigo, Manuel A.; Panizza, Marco; Cerisola, G.

doi:10.1007/s10800-009-9880-8

Cited by 69 publications

(24 citation statements)

References 44 publications

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“…It can been seen that color (measured from changes of absorbance at 535 nm) was faster than the decrease in absorbance at 330 nm and COD, indicating that RR120 oxidation began with breaking the nitro groups (decoloration of the solution) and continued with the cleavage of the aromatic ring (removal of absorbance at 330 and 265 nm) to form aliphatic intermediates, which were finally mineralized to carbon dioxide. Similar behavior has recently been reported for the direct electrochemical oxidation of Acid Yellow 1 [48] and methyl red [33] on BDD.…”

Section: Resultssupporting

confidence: 87%

Electrochemical degradation of Reactive Red 120 using DSA and BDD anodes

et al. 2010

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Electrochemical oxidation of an azo dye (Reactive Red 120) was studied in acidic media (1 M HClO 4 ) using DSA type (Ti/IrO 2 -RuO 2 ) and boron doped diamond (BDD) anodes. Ti/IrO 2 -RuO 2 exhibited low oxidation power with high selectivity to organic intermediates and low TOC removal (10% at 25°C and 40% at 80°C). On the other hand BDD was found to be suitable for total mineralization of the organic loading to CO 2 . In both cases, the decoloration of the solution was almost 100% achieved very quickly with BDD (2 Ah L -1 ) but only after long treatment with Ti/IrO 2 -RuO 2 (25 Ah L -1 ). The instantaneous current efficiency (ICE) was up to 0.13 in the case of Ti/IrO 2 -RuO 2 and up to 0.45 in the case of BDD.

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Section: Resultssupporting

confidence: 87%

Electrochemical degradation of Reactive Red 120 using DSA and BDD anodes

et al. 2010

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“…3) and Figs. [4][5][6] show that the discoloration process is slightly dependent on the catalyst dosage within the range essayed for MeO in this work. Only a small enhancement is observed in terms of decreases of t 1/2 and t 90% or increases of k app and yield 90min .…”

Section: Methyl Orangesupporting

confidence: 53%

“…The conventional technologies currently used to bleach dyecontaminated effluents may be primary (flocculation and adsorption) [1,2], secondary (activated sludge) [3], or advanced tertiary treatments (oxidation and electrolysis) [4]. However, these classical techniques are not efficient enough because synthetic dyes are designed to resist chemical and biological degradation.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Discoloration of Dyes: Relation between Effect of Operating Parameters and Dye Structure

Camarillo

Rincón

2011

Chem Eng & Technol

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The process of TiO 2 /UV photocatalytic discoloration of wastewaters containing organic dyes is influenced by a number of variables. In this paper, the effects of some of these parameters, i.e., mass of catalyst, initial dye concentration, and pH, were related to the structural nature of the dyes investigated, azo and anthraquinone dyes, two families that are representative of about 75 % of the dyes marketed nowadays. Both bibliographical and own experimental data were used to analyze and discuss the photocatalytic discoloration in terms of dye structure and degradation pathways. It is shown that azo dyes (Methyl Orange, Metanil Yellow, Acid Orange 7, and Reactive Red 120) are more easily discolored than Reactive Blue 19 (anthraquinone dye), due to the higher molecular stability of the latter. It is also shown that azo dye discoloration is more influenced by the initial dye concentration, whereas recalcitrant anthraquinone dyes (Reactive Blue 19) mainly demand for basic pH values to generate enough OH . radicals. Concerning TiO 2 loading, both the bibliographical and current research data showed no effect of this variable in the experimental range analyzed.

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“…Moreover, the reaction between the hydroxyl radicals and the organic molecules is very fast and its rate is only slightly affected by the solution pH [21] and temperature [47].…”

Section: Resultsmentioning

confidence: 99%

Electrochemical process for the treatment of landfill leachate

2010

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In this paper, the anodic oxidation of a real leachate from an old municipal solid waste landfill has been studied using an electrolytic flow cell equipped with a lead dioxide (PbO 2 ) anode and stainless steel as the cathode. The influence of several operation parameters such as (i) the applied current (from 0.5 to 3 A), (ii) liquid flow rate (from 50 to 420 L h -1 ), (iii) temperature (from 25 to 50°C), and (iv) pH (from 3.5 to 8.2) on the COD removal rate, current efficiency, and energy consumption has been evaluated. The galvanostatic electrolyses always yielded COD values below the discharge limit (COD \160 mg L -1 ); the COD removal rate increased with rising applied current, solution pH, and temperature, whereas it remained almost unaffected by the recirculation flow rate. These results indicate that the organic compounds were mainly removed by their indirect oxidation by the active chlorine generated from chlorides oxidation. The specific energy consumption necessary to reduce the organic load to below the disposal limit was 90 kWh m -3 .

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Electrochemical oxidation of Acid Yellow 1 using diamond anode

Cited by 69 publications

References 44 publications

Electrochemical degradation of Reactive Red 120 using DSA and BDD anodes

Electrochemical degradation of Reactive Red 120 using DSA and BDD anodes

Photocatalytic Discoloration of Dyes: Relation between Effect of Operating Parameters and Dye Structure

Electrochemical process for the treatment of landfill leachate

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