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Bechtold, Thomas; Burtscher, Eduard; Turcanu, Aurora; Bobleter, O.

doi:10.1023/a:1018426307725

Cited by 31 publications

(40 citation statements)

References 9 publications

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“…In a suspension in strongly alkaline aqueous solution it can be reduced by sodium dithionite or iron(II)triethanolamine complex to soluble leucoindigo which may then be oxidized back to the original indigo by oxygen [53]. Indigo dissolved in pyridine can reversibly be electroreduced to leucoindigo on a mercury electrode in presence of pyridinium nitrate as an electron donor [54] (Scheme 1).…”

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confidence: 99%

Voltammetry of Organic Microparticles

1999

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Solid microparticles of several different insoluble organic compounds were mechanically immobilized on the surface of graphite electrodes and immersed into a liquid electrolyte in order to study their electrochemical reactions. Cyclic staircase voltammetry and square-wave voltammetry were used. Quinhydrone was found to be a stable intermediate in the reversible redox reaction of solid quinone and hydroquinone on the electrode surface. The reaction occurs on the surface of the solid particle which is in contact with water. Indigo can be reduced to leucoindigo and oxidized to dehydroindigo in two separate reversible redox reactions. In strongly basic medium indigo dissolves in water upon electroreduction. A hydroacridine radical was detected as a stable intermediate in the electrochemically irreversible redox reaction of acridine and dihydroacridine. Famotidine can be electrooxidized and the product of this reaction can be electroreduced in two separate chemically irreversible reactions. Probucol is oxidized to a semiquinone radical which can be re-reduced in an electrochemically irreversible redox reaction. Propylthiouracil can be also oxidized to an unknown product which can be re-reduced in a chemically reversible, but slow solid state surface redox reaction. Reductions of solid thionicotinoylanilide and nicotinoylanilide are totally irreversible.

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confidence: 99%

Voltammetry of Organic Microparticles

1999

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“…Promising results were achieved in the seventies by Frind et al [10]. More detailed studies to reduce crude filter cake of CI Sulphur Black 1 electrochemically proved the principle of reducing the dye by cathodic reduction and applying the product in continuous dyeing operations [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…The high variability of CI Sulphur Black 1 makes use of analytical methods difficult and at present only sumparameters, like titration with K 3 (Fe(CN) 4 ] and model dyeing results have been used to confirm that cathodic reduction does not destroy the dyestuff irreversibly [10][11][12][13]. Model dyeings are very sensitive to irreversible changes in the molecular structure, which would change affinity and shade of the dyeing, compared to reference dyeings [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Model dyeings are very sensitive to irreversible changes in the molecular structure, which would change affinity and shade of the dyeing, compared to reference dyeings [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…For exhaust dyeing operations the application of indirect cathodic reduction with use of mediator systems also has been investigated [14]. The redox behaviour of CI Sulphur Black 1, which can undergo several reduction/oxidation steps in solution, could form the basis for use of the dyestuff both as colorant and mediator to stabilise the reduction conditions in the dyebath [8].…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical reduction of CI sulphur black 1—correlation between electrochemical parameters and colour depth in exhaust dyeing

2007

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Direct cathodic reduction of oxidised CI Sulphur Black 1 was achieved by means of a multi-cathode electrolyser at cell currents of 0.9-1.5 A. The redox potential in the catholyte decreased from initially À250 to À533 mV as a function of charge flow. The catholyte also served as dyebath for cotton fabric samples. Colour depth was characterised by Kubelka-Munk value K/S and CIELab-coordinates and was studied as function of charge flow and redox potential in the catholyte. Direct correlation between redox potential and colour depth of the dyed samples was observed. Electrochemical reduction permits steering of catholyte/dyebath potential by adjustment of cell current and thus permits direct control of the dyeing process by electrochemical methods.

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Optimization of Multi-Cathode Membrane Electrolysers for the Indirect Electrochemical Reduction of Indigo

Bechtold¹,

Burtscher

Bobleter

et al. 1998

Chem. Eng. Technol.

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In order to color cellulose fibers with vat or sulfur dyes, large amounts of nonregenerable reducing agents are usually required. In this paper, the authors present the use of indirect electrochemical reduction, thus, offering economic and ecological advantages. Multi‐cathode cells are used to overcome low cell current and a further increase in cell current is achieved by using three‐dimensional flow‐through electrodes.

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Untitled

Cited by 31 publications

References 9 publications

Voltammetry of Organic Microparticles

Voltammetry of Organic Microparticles

Electrochemical reduction of CI sulphur black 1—correlation between electrochemical parameters and colour depth in exhaust dyeing

Optimization of Multi-Cathode Membrane Electrolysers for the Indirect Electrochemical Reduction of Indigo

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