Calcium-iron-D-gluconate complexes for the indirect cathodic reduction of indigo in denim dyeing: A greener alternative to non-regenerable chemicals

JOURNAL OF CLEANER PRODUCTION

卷:266

Article

Abdelileh, Maha^1,2  Manian, Avinash P.^3,5  Rhomberg, Dorian^3,5  Ben Ticha, Manel^1,4  Meksi, Nizar^1,2  Aguilo-Aguayo, Noemi^3,5  Bechtold, Thomas^3,5 

[1] Univ Monastir, Fac Sci Monastir, Res Unity Appl Chem & Environm, Monastir 5000, Tunisia

[2] Univ Monastir, Natl Engn Sch Monastir, Dept Text Engn, Monastir 5000, Tunisia

[3] Leopold Franzens Univ Innsbruck, Res Inst Text Chem & Text Phys, Hoechsterstr 73, A-6850 Dornbirn, Austria

[4] Univ Taif, Univ Coll Turabah, Fash Design & Fabr Dept, At Taif, Saudi Arabia

[5] EPNOE European Polysaccharide Network Excellence, Wageningen, Netherlands

关键词: Electrochemical reduction;    Indigo;    Embroidered electrode;    Denim;    Dyeing;   

DOI  :  10.1016/j.jclepro.2020.121753

来源: Elsevier

【 摘 要 】

With an annual production of approximately 7-10 billion m(2) the manufacturing of indigo dyed denim takes a substantial share in global textile production. At present the vast majority of dyeing processes with indigo still bases on the use sodium dithionite as reducing agent. Fora successful replacement of the non-regenerable reducing agent by electrochemical processes, a combination of a regenerable redox system with an appropriate cell design is required. In the presented study, the use of embroidered electrodes in an 85 mA flow-through electrolyser for electrochemical indigo reduction has been investigated for the first time. Indirect cathodic reduction of indigo was achieved with use of a 0.1 M solution of a binuclear complex of calcium and iron with D-gluconate as a ligand. The electrochemically reduced indigo was then used in lab scale dyeing (1-3.5 g L-1 indigo), and the results were compared to reference dyeing experiments with sodium dithionite as reducing agent, by measuring the colour strength and CIElab colour coordinates. Comparison of the electrochemical technique for indigo reduction with the dithionite-based standard process indicates substantial potential for an improvement of the ecological profile of the dyeing process used at present. The electrical power demand for a full scale electrolyser is estimated to be in the range of 2.8-6.9 kW, leading to an energy consumption of 58-145 kWh d(-1) as compared to a sodium dithionite consumption of 50-126 kg d(-1). Introduction of biobased and regenerable chemical systems instead of non regenerable chemicals in indigo dyeing offers significant potential for reduction of the chemical load released into wastewater. A reduction of the sulphate concentration in the wastewater from the current values of 640-1600 mg L-1 to values well below the legal limit of 200 mg L-1 sulphate will be possible. By reuse of the washing water and the reversible reducing agent, a reduction of both water consumption (by 80%) and chemical consumption (by 50%) are expected. (C) 2020 The Author(s). Published by Elsevier Ltd.

【 授权许可】

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