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

IF 3.8 2区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Scientific Reports Pub Date : 2020-03-18 DOI:10.1038/s41598-020-61795-5

Changhai Yi, Xiaodong Tan, Bihan Bie, Haitao Ma, Hong Yi

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引用次数: 19

Abstract

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 (Na₂S₂O₄)", 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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实用环保的靛蓝间接电化学还原和染色。

靛蓝因其对纤维素纤维的染色牢度好，在工业染色中得到了广泛的应用。然而，工厂在实际生产中一直使用过量的还原剂“保险粉(Na2S2O4)”，造成了严重的污染(水污染和空气污染)。在此，我们开发了一种实用且环保的靛蓝间接电化学还原方法，并将该方法应用于织物染色。设计了电催化还原源与染色源相结合的电化学装置。铁-三乙醇胺-葡萄糖酸钙(Fe-TEOA-Ca)配合物起到关键中间体的作用，超声波对间接电催化过程有加速作用。钙离子的加入改善了中间体的电化学性能。用草酸溶液洗涤后，染色织物的色牢度达到行业标准。总的来说，我们的方法开辟了一条电化学还原靛蓝的绿色路线，这可能会改变靛蓝染色的工业工艺流程。

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来源期刊

Scientific Reports Natural Science Disciplines-

CiteScore

7.50

自引率

4.30%

发文量

19567

审稿时长

3.9 months

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