Indirect cathodic reduction of dispersed CI Vat Blue 1 (indigo) by dihydroxy-9,10-anthraquinones in cyclic voltammetry experiments

Turcanu, Aurora; Fitz-Binder, Christa; Bechtold, Thomas

doi:10.1016/j.jelechem.2011.01.040

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…Electrochemical reduction mainly includes direct electrochemical reduction, indirect electrochemical reduction and electrocatalytic hydrogenation reduction (Roessler and Jin, 2003). Among them, indirect electrochemical reduction uses reversible redox pairs, mainly iron complexes, as electron transfer mediators between the dye and the electrode (Turcanu et al , 2011; Xiao et al , 2018). The essence of both direct and indirect electrochemical reduction is the use of electrons from the electrode for reduction.…”

Section: Introductionmentioning

confidence: 99%

Cu(II)/sodium borohydride-based electrocatalytic system for reduction and dyeing of indigo

Zhang

Yao

et al. 2021

PRT

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Purpose To improve the problems as the heavy burden of sewage treatment and environmental pollution caused by the traditional sodium hydrosulfite reduction dyeing of indigo, this study aims to carry out the direct electrochemical reduction dyeing for indigo with the eco-friendly Cu(II)/sodium borohydride reduction system under normal temperature and pressure conditions. Design/methodology/approach The electrochemical behavior of Cu(II)/sodium borohydride reduction system was investigated by cyclic voltammetry. And, the dyeing performance of the Cu(II)/sodium borohydride reduction system was developed by optimizing the concentration of copper sulfate in the anode electrolyte, applied voltage and reduction time via single-factor and orthogonal integrated analysis. Findings The dyeing performance of the Cu(II)/sodium borohydride reduction system is superior to that of the traditional reduction dyeing with sodium hydrosulfite. In the case of the optimized condition, the soaping fastness and dry/wet rubbing fastness of the dyed fabric in the two reduction dyeing processes were basically comparable, the K/S value of electrocatalytic reduction of indigo by Cu(II)/NaBH4 is 11.81, which is higher than that obtained by traditional sodium hydrosulfite reduction dyeing of indigo. Originality/value The innovative electrocatalytic reduction system applied herein uses sodium borohydride as the hydrogen source combined with Cu(II) complex as the catalyst, which can serve as a medium for electron transfer and active the dye molecule to make it easier to be reduced. The electrochemical dyeing strategy presented here provides a new idea to improve the reduction dyeing performance of indigo by sodium borohydride.

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Section: Introductionmentioning

confidence: 99%

Cu(II)/sodium borohydride-based electrocatalytic system for reduction and dyeing of indigo

Zhang

Yao

et al. 2021

PRT

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“…The indirect electro-chemical reduction by using a media to reduce the indigo can address the mass transfer and improve the reductive efficiency [16][17][18] . The intermediate mediates have been optimized by measuring current efficiency and electrochemical parameters, in which iron salt is proved to be an efficient media to reduce indigo [18][19][20][21][22][23][24][25][26][27][28] . Although several reports existed, the low concentration reductive leuco indigo can not be used for dyeing, and also dyeing fails to be realized in the combination of electrochemical indigo reduction.…”

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confidence: 99%

Practical and environment-friendly indirect electrochemical reduction of indigo and dyeing

Tan

Bie

et al. 2020

Sci Rep

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indigo has been widely used as a dye in the industrial dyeing due to its good color fastness in dyeing cellulose fibers. However, excess reducing agent, "insurance powder (Na 2 S 2 o 4)", was always used in the actual production of the factory, sparking serious pollution (water pollution and air pollution). Herein, we developed a practical and environment-friendly indirect electrochemical reduction of indigo, and applied this method for cloth dyeing. The electrochemical device was designed in the combination of source of electro-catalytic reduction and dyeing. The iron-triethanolamine-calcium gluconate (Fe-TEOA-Ca) complex played a role of key intermediate, and ultrasonic wave was found to speed up the indirect electro-catalytic process. The electrochemical performance of intermedia was improved by calcium ion addition. Washed with oxalic acid solution, the dyed fabric could achieve the level of color fastness in industry standard. Generally speaking, our method leads to a green route for indigo reduction using electrochemistry, which may change the crafting process of indigo dyeing in industry.

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Indigo and Indigo Colorants

Paul

Blackburn

Bechtold

2021

Ullmann's Encyclopedia of Industrial Chemistry

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Indirect cathodic reduction of dispersed CI Vat Blue 1 (indigo) by dihydroxy-9,10-anthraquinones in cyclic voltammetry experiments

Cited by 9 publications

References 25 publications

Cu(II)/sodium borohydride-based electrocatalytic system for reduction and dyeing of indigo

Cu(II)/sodium borohydride-based electrocatalytic system for reduction and dyeing of indigo

Practical and environment-friendly indirect electrochemical reduction of indigo and dyeing

Indigo and Indigo Colorants

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