Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (09): 104-111.doi: 10.13475/j.fzxb.20201002808

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Direct electrochemical reduction of vat dyes on carbon felt electrodes

YANG Zhuo, WANG Wei()   

  1. College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
  • Received:2020-10-20 Revised:2021-06-19 Online:2021-09-15 Published:2021-09-27
  • Contact: WANG Wei E-mail:wangv@dhu.edu.cn

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Abstract:

The direct electrochemical reduction of vat dyes is difficult to carry out due to poor contact between insoluble vat dyes and the electrodes. In order to solve this problem, using graphite felt as the electrode, under a three-electrode system, the electrochemical behaviors of Vat Yellow 3RT, Vat Green FFB and Vat Olive Green B were studied, and the effects of temperature, voltage, current, electrolyte and dye concentration on direct electrochemical reduction were explored, the current efficiency and conversion rate of electrochemical reduction were also tested. The results show that vat dyes could be directly reduced into leuco. Using carbon felt cathode as electrode direct electrochemical reduction rate could be effectively improved. Electrochemical reduction rate increases significantly with the increase of temperature. At excessive level of negative potential or current, hydrogen evolution begins to occur and becomes the main rection, which affects the rate of dye reduction. Under the conditions of 60 ℃ and -1.0 V, the vat dyes could be reduced within 10 min to 40 min, and the conversion rate could reach more than 90%, and the current efficiency is between 50% and 60%.

Key words: direct electrochemistry, vat dyes, carbon felt, current efficiency

CLC Number: 

  • TS193.5

Fig.1

Cyclic voltammograms of 0.2 g/L vat dyes in 0.5 mol/L NaOH solution"

Fig.2

UV-Vis spectra of vatdyes after electrochemical reduction and chemical reduction. (a) Vat Yellow 3RT; (b) Vat Olive Green B; (c) Vat Green FFB"

Fig.3

Influence of electrochemical reduction temperature on reduction rate. (a) Vat Yellow 3RT; (b) Vat Olive Green B; (c)Vat Green FFB"

Fig.4

Influence of electrochemical reduction voltage on reduction rate. (a) Vat Yellow 3RT; (b) Vat Olive Green B; (c) Vat Green FFB"

Tab.1

Conversion rate and current efficiency at different voltages"

电压/V 还原黄3RT 还原橄榄绿B 还原绿FFB
还原时间/min 转化率/% 电流效率/% 还原时间/min 转化率/% 电流效率/% 还原时间/min 转化率/% 电流效率/%
-0.8 18 88.7 66.1 30 95.6 51.3 80 87.5 44.6
-1.0 12 87.5 58.5 10 99.1 53.7 35 91.3 50.8
-1.2 12 87.3 35.6 10 98.0 35.5 100 90.6 3.9
-1.4 12 87.5 6.8 — — — 180 80.6 0.1

Fig.5

UV-Vis spectra(a) of Vat Olive Green B and reflectivity (b) of dyed fabric at different voltage"

Fig.6

Influence of current on reduction rate. (a)Vat Yellow 3RT; (b) Vat Olive Green B; (c) Vat Green FFB"

Tab.2

Conversion rate and current efficiency at different current"

电流强度/mA 还原黄3RT 还原橄榄绿B 还原绿FFB
还原时间/min 转化率/% 电流效率/% 还原时间/min 转化率/% 电流效率/% 还原时间/min 转化率/% 电流效率/%
10 15 93.5 33.8 10 94.2 25.2 100 82.4 2.2
5 20 94.4 51.2 15 96.1 34.4 60 87.7 8.0
3 40 95.0 49.2 25 98.0 35.0 60 87.7 13.3
1 110 94.5 47.0 60 95.9 42.9 70 91.5 35.7

Fig.7

Influence of NaOH concentration on reduction rate under same electrolyte concentration. (a)Vat Yellow 3RT; (b) Vat Olive Green B; (c) Vat Green FFB"

Fig.8

Influence of NaOH concentration on reduction rate under different electrolyte concentration. (a)Vat Yellow 3RT; (b) Vat Olive Green B; (c) Vat Green FFB"

Fig.9

Influence of dye concentration on reduction rate. (a) Vat Yellow 3RT; (b) Vat Olive Green B; (c) Vat Green FFB"

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