Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (01): 75-79.doi: 10.13475/j.fzxb.20190104706

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Effect of different iron salt media on indigo electrochemical reduction system

WANG Kangkang, LI Xiaoyan, YAO Jiming()   

  1. College of Textile and Garment, Hebei University of Science and Technology, Shijiazhuang, Hebei 050018, China
  • Received:2019-01-23 Revised:2019-10-23 Online:2020-01-15 Published:2020-01-14
  • Contact: YAO Jiming E-mail:yaojiming66@126.com

Abstract:

Aiming at the problems of low dye reduction rate and poor dyeing depth in the current electrochemical dyeing process, this paper reports on the use of iron salt solutions with different valence states as media to form a synergistic complexation system with sodium gluconate and Abal B ligand, to achieve electrochemical reduction of the indigo dye. By controlling dyeing solution reduction potential, dye reduction rate, ferrous ion conversion rate, the effects of different iron salt media on the reduction effect of indigo dyes were studied. The effects of dye concentration, voltage and time on the performance of indirect electrochemical reduction system of indigo dye were investigated. The results show that the optimum process conditions were the concentration of indigo 2.5 g/L, ferrous sulfate 15 g/L, sodium gluconate 12 g/L,Abal B 10.5 g/L, sodium hydroxide 37.5 g/L, working voltage 10 V, and electrification time 40 min. Under these conditions, the reduction rate reached 89.95%, the dyeing depth value of dyeing was improved by 4.5% compared with that of traditional process. The color fastness of the two processes was found similar.

Key words: indigo dye, electrochemical dyeing, iron salt solution, dyeing depth, ferrous ion conversion rate

CLC Number: 

  • TS193.639

Fig.1

Dyeing process of electrochemical"

Fig.2

Dyeing process of traditional Na2S2O4"

Tab.1

Electrochemical reduction performance in different media systems"

媒介
编号
媒介 配位体
溶液稳定性
配位体溶液
还原电位/
mV
还原液
还原电位/
mV
1 硝酸亚铁 溶液澄清、稳定、无沉淀 -814 -798
2 硝酸铁 溶液澄清、稳定、无沉淀 -763 -731
3 氯化亚铁 溶液澄清、稳定、无沉淀 -831 -807
4 氯化铁 溶液澄清、稳定、无沉淀 -762 -723
5 硫酸亚铁 溶液澄清、稳定、无沉淀 -842 -816
6 硫酸铁 溶液澄清、稳定、无沉淀 -770 -745

Tab.2

Performance of different concentrations of ferric sulfate systems"

编号 硫酸铁质量
浓度/(g·L-1)
硫酸亚铁质量
浓度/(g·L-1)
配位体溶液
还原电位/mV
还原液
还原电位/mV
染料
还原率/%
亚铁离子
转化率/%
1 8 0.0 -770 -745 58.23 86.73
2 6 2.5 -814 -783 67.46 89.24
3 4 5.0 -827 -796 74.67 87.52
4 2 7.5 -825 -802 76.52 90.31
5 0 10.0 -842 -816 81.03 89.65

Tab.3

Mean, range values and performance index of various influencing factors at different levels"

试验
编号
还原液
质量浓度
增加倍数
电压/
V
通电时
间/min
还原液
还原电
位/mV
染料
还原
率/%
亚铁离
子转换
率/%
1# 1.0 5 20 -797 77.56 94.32
2# 1.0 10 40 -807 79.75 94.54
3# 1.0 15 60 -801 77.87 92.24
4# 1.5 5 40 -857 85.12 95.76
5# 1.5 10 60 -856 84.77 95.25
6# 1.5 15 20 -857 85.25 95.37
7# 2.0 5 60 -890 87.62 95.16
8# 2.0 10 20 -914 89.95 96.21
9# 2.0 15 40 -900 89.76 95.73
还原
液还
原电
均值1 -801.667 -848.000 -854.000
均值2 -856.667 -859.000 -854.333
均值3 -901.000 -852.333 -849.000
极差 99.333 11.000 6.666
染料
还原
均值1 78.393 83.433 84.253
均值2 85.047 84.823 84.877
均值3 89.110 84.293 83.420
极差 10.717 1.390 1.457
亚铁
离子
转化
均值1 93.700 95.080 95.300
均值2 95.460 95.333 95.343
均值3 95.700 94.447 94.217
极差 2.000 0.886 1.126

Tab.4

Comparison of dyeing properties under different processes"

工艺 L* a* b* K/S 耐皂
洗色
牢度/
耐摩擦色
牢度/
湿
1 29.24 -2.63 -15.29 11.84 5 4~5 3
2 25.32 -1.56 -16.43 12.37 5 4~5 3
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