New Catalysts for the Borohydride Dyeing Process

Meksi, Nizar; Ticha, Manel Ben; Kechida, Moez; Mhenni, Mohamed Farouk

doi:10.1021/ie100974d

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…Metal ions are acted as Lewis acid sites in solution to promote the release of H – from sodium borohydride and thus improve the reduction efficiency of sodium borohydride. In addition to the metal salt catalyst, the reduction of indigo by sodium borohydride may require additional thermal heating (Meksi et al , 2010), which undoubtedly makes the reduction process cumbersome and less controllable due to the heat-up operation and exothermic hydrolysis of sodium borohydride.…”

Section: Introductionmentioning

confidence: 99%

Cu(II)/sodium borohydride-based electrocatalytic system for reduction and dyeing of indigo

Zhang

Yao

et al. 2021

PRT

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Purpose To improve the problems as the heavy burden of sewage treatment and environmental pollution caused by the traditional sodium hydrosulfite reduction dyeing of indigo, this study aims to carry out the direct electrochemical reduction dyeing for indigo with the eco-friendly Cu(II)/sodium borohydride reduction system under normal temperature and pressure conditions. Design/methodology/approach The electrochemical behavior of Cu(II)/sodium borohydride reduction system was investigated by cyclic voltammetry. And, the dyeing performance of the Cu(II)/sodium borohydride reduction system was developed by optimizing the concentration of copper sulfate in the anode electrolyte, applied voltage and reduction time via single-factor and orthogonal integrated analysis. Findings The dyeing performance of the Cu(II)/sodium borohydride reduction system is superior to that of the traditional reduction dyeing with sodium hydrosulfite. In the case of the optimized condition, the soaping fastness and dry/wet rubbing fastness of the dyed fabric in the two reduction dyeing processes were basically comparable, the K/S value of electrocatalytic reduction of indigo by Cu(II)/NaBH4 is 11.81, which is higher than that obtained by traditional sodium hydrosulfite reduction dyeing of indigo. Originality/value The innovative electrocatalytic reduction system applied herein uses sodium borohydride as the hydrogen source combined with Cu(II) complex as the catalyst, which can serve as a medium for electron transfer and active the dye molecule to make it easier to be reduced. The electrochemical dyeing strategy presented here provides a new idea to improve the reduction dyeing performance of indigo by sodium borohydride.

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Section: Introductionmentioning

confidence: 99%

Cu(II)/sodium borohydride-based electrocatalytic system for reduction and dyeing of indigo

Zhang

Yao

et al. 2021

PRT

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“…Therefore, the reduction of indigo by sodium borohydride often requires additional thermal energy to increase the reactive activity with the combination of metal salts as the catalysts. As the chemical interaction between the metal atom and the oxygen atom of the carbonyl group activates the carbon atom, promoting Hattack and then making it possible to reduce the carbonyl group on indigo (Meksi et al, 2007(Meksi et al, , 2010Meksi et al, 2010;Brown et al, 1982). However, the temperature as the important reaction factor is difficult to control under such tedious reduction process due to the continuous exothermic reaction of sodium borohydride, for example, the internal temperature of the solution is not consistent.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical reduction of indigo by combination of sodium borohydride and copper salt

Wang

et al. 2020

PRT

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Purpose The purpose of this study is to improve the performance of sodium borohydride in reducing indigo at room temperature, the divalent copper ion complex was combined with electrochemical technology for the reduction of indigo by sodium borohydride. Design/methodology/approach According to the K/S value of the dyed cloth sample, find a more suitable ligand for the copper ion in the catholyte. Response surface analysis tests were performed to evaluate the effects of sodium borohydride concentration, sodium hydroxide concentration and copper sulfate pentahydrate concentration on the reduction potential of the dye solution and the K/S value of the dyed fabric samples. Findings Sodium gluconate was found to be a more suitable ligand for copper ions in catholyte. The effects of NaOH concentration as well as the interaction of NaBH4 and NaOH on the reduction potential of the catholyte and the K/S value of the dyed fabric samples were extremely significant. The optimal concentrations of NaBH4, NaOH and CuSO4•5H2O were 0.5, 2.5 and 0.65 g/L. In the case of the optimized condition, the absolute value of the reduction potential was 968, and the K/S value was 11.92, which is comparable with that of the conventional reduction process with sodium dithionite. Originality/value The divalent copper ion complex combined with electrochemical technology was applied in the process of reducing indigo with NaBH4 at room temperature.

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“…In addition to cotton, other fibres, for example, silk and wool and polyester have also been dyed using different methods in the past. (Baig, 2011;Tichaa, 2013;Meksi,2007Meksi, -2010 Experimental Materials: In the present study, 100% knitted cotton fabric samples (130g/m 2 ) were dyed with Indigo 4B coll liq., supplied by DyStar. It was found that the color yield and the fastness properties were improved when using NaBH4 giving fastness properties better than those obtained with Na2S2O4 as reducing agent (Merck).…”

Section: Introductionmentioning

confidence: 99%

Investigation of Indigo Dyeing Using Sodium Borohydride as Reducing Agent

BÜYÜKAKINCI

Sökmen

2017

CBUP

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Indigo, one of the oldest dyes, has a very important role for the textile sector. It is primarily used to dye cotton clothes, and blue jeans and over one billion pairs of jeans around the world are dyed blue with indigo. Although Sodium Hydrosulfite (Na2S2O4) is used as a reducing agent in most indigo dyeing processes, it is environmentally unfavorable because of the resultant contaminated toxic wastewater. In addition, the color fastnesses of dyed samples using Na2S2O4 as reducing agent are not good enough. In the present paper sodium borohydride (NaBH4) were used as ecologically safe reduction systems for the indigo dyeing of cotton fabric. After dyeing processes, the color yield and fastnesses according to washing and rubbing were measured, and results were compared. It was found when NaBH4 was used as reducing agent instead of Na2S2O4, the color yield and the fastness properties of the dyed samples improved. JEL Classification Numbers: L65, L67, Q53; DOI: http://dx

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New Catalysts for the Borohydride Dyeing Process

Cited by 8 publications

References 16 publications

Cu(II)/sodium borohydride-based electrocatalytic system for reduction and dyeing of indigo

Cu(II)/sodium borohydride-based electrocatalytic system for reduction and dyeing of indigo

Electrochemical reduction of indigo by combination of sodium borohydride and copper salt

Investigation of Indigo Dyeing Using Sodium Borohydride as Reducing Agent

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