物理化学学报 >> 2010, Vol. 26 >> Issue (03): 589-594.doi: 10.3866/PKU.WHXB20100301

电化学 上一篇    下一篇

铁-三乙醇胺媒质中靛蓝的间接电化学还原

马淳安, 周亚明, 徐颖华, 江欢欢, 李姗姗   

  1. 浙江工业大学化学工程与材料学院, 绿色化学合成技术国家重点实验室培育基地, 杭州 310032
  • 收稿日期:2009-09-16 修回日期:2009-12-25 发布日期:2010-03-03
  • 通讯作者: 马淳安, 徐颖华 E-mail:science@zjut.edu.cn; xuyh@zjut.edu.cn

Indirect Electrochemical Reduction of Indigo Using Fe-Triethonolamine

MA Chun-An, ZHOU Ya-Ming, XU Ying-Hua, JIANG Huan-Huan, LI Shan-Shan   

  1. State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering and Materials, Zhejiang University of Technology, Hangzhou 310032, P. R. China
  • Received:2009-09-16 Revised:2009-12-25 Published:2010-03-03
  • Contact: MA Chun-An, XU Ying-Hua E-mail:science@zjut.edu.cn; xuyh@zjut.edu.cn

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摘要：

铁-三乙醇胺(Fe-TEA)可作为媒质用于间接电化学法还原靛蓝. 本工作采用循环伏安法研究了靛蓝在Fe-TEA媒质中的电化学行为, 比较了石墨、银、镍、不锈钢四种阴极材料的电催化性能, 探讨了靛蓝间接电还原的机理. 此外, 还进行了一组L9(34)正交电解实验, 通过正交实验分析了各因素对电流效率的影响. 实验结果表明: 在Fe(III)-TEA媒质中, 以不锈钢网为阴极可实现靛蓝的间接电化学还原, 最高电流效率可达44.7%. 在实验所设计因素水平范围内, 对电流效率影响最大的因素为Fe(III)-TEA媒质浓度. 在靛蓝的间接电还原过程中存在一种靛蓝自由基, 该自由基能起到靛蓝电还原的媒质作用, 在一定实验条件下, 该靛蓝自由基的媒质作用可以大于Fe(III)-TEA.

关键词: 电化学染色, 靛蓝, 还原染料, 间接电化学还原

Abstract:

Fe-triethonolamine (Fe-TEA) complexes as mediator are well suitable for the indirect reduction of indigo. In our work, the reduction of indigo was investigated in a Fe-TEA systemby cyclic voltammetry (CV). The electrocatalytic performance of four kinds of cathode materials (graphite, silver, nickel, and stainless steel) for the reduction of Fe(III)-TEA was compared. Further experiments were carried out to compare the effects of operating parameters including temperature, current, concentrations of NaOH and Fe(III)-TEA. Experimental results showed that this new route was feasible for the production of water-soluble indigo. A high current efficiency (44.7%) was achieved using optimized conditions and the concentration of the Fe(III)-TEA mediator was found to be the main influence. A new indigo radical mediator was formed during electrolysis and under certain condition, the effect of this indigo radical on the current efficiency was larger than that of Fe(III)-TEA.

Key words: Electrochemical dyeing, Indigo, Vat dye, Indirect electrochemical reduction