Sustainable electrochemical dyeing of indigo with Fe(II)-based complexes

JOURNAL OF CLEANER PRODUCTION

卷:276

Article

Li, Xiaoyan¹  Wang, Kangkang¹  Wang, Mengqian¹  Zhang, Wei¹  Yao, Jiming¹  Komarneni, Sridhar^2,3 

[1] Hebei Univ Sci & Technol, Coll Text & Garment, Innovat Ctr Text & Garment Technol, Shijiazhuang 050018, Hebei, Peoples R China

[2] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA

[3] Penn State Univ, Dept Ecosyst Sci & Management, Energy & Environm Lab 204, University Pk, PA 16802 USA

关键词: Indigo;    Indirect electrochemical dyeing;    Mechanism of dye reduction;    Fe(II) complex;    Gray clustering analysis;   

DOI  :  10.1016/j.jclepro.2020.123251

来源: Elsevier

【 摘 要 】

In order to avoid the intensive burden of sewage treatment in the traditional dyeing process of indigo caused by the heavy usage of sodium dithionite (Na2S2O4), an indirect electrochemical reduction dyeing method for denim fabrics was carried out. The indirect electrochemical reduction dyeing with different iron-based complexes was explored by cyclic voltammetry. In addition, the stability of the complex solution, the reduction potential of the dye solution, the rate of dye reduction (Re) and ferrous ion conversion (Xe) in the electrochemical process were investigated, which showed that the Fe(II)-DGS-Abal B complex containing ferrous sulfate, sodium gluconate and Abal B (a complexing agent with high alkali resistance and electrical conductivity based on triethanolamine) had stronger reducing capacity. Furthermore, orthogonal experiments and gray clustering analysis were utilized to optimize the indirect electrochemical dyeing process for denim fabric. Under the optimized electrochemical reduction dyeing process, the rate of dye reduction could be up to 91.23% and the K/S value of dyed denim fabric could reach 14.75, which is 6.58% higher than that of the traditional dyeing process. Besides, the dyeing depth is nearly invariable within 7 times of cyclic dyeing and the dyeing liquid is more susceptible to biological and chemical degradation. Compared with the traditional reduction dyeing with Na2S2O4 at higher temperature, the electrochemical reduction dyeing strategy uses electrical energy to reduce indigo at room temperature, and the reduction medium could be sustainably utilized by the circulation pump after the cyclic electrochemical reduction dyeing is completed, which not only decreases the COD value of dyeing wastewater, but also saves 63.5% of the economic cost. The eco-friendly electrochemical dyeing strategy presented here with obvious economic benefits could significantly contribute to enhance the sustainability of dyeing process for denim production. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

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