Green reducing agents for indigo dyeing on cotton fabrics

Saikhao, Laksanawadee; Setthayanond, Jantip; Karpkird, Thitinun; Bechtold, Thomas; Suwanruji, Potjanart

doi:10.1016/j.jclepro.2018.06.199

Cited by 81 publications

(45 citation statements)

References 26 publications

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“…5d, most of the strength loss already occurred within the rst 15 minutes, and the tensile strength of the cotton fabric only decreased gently with prolonged treatment, by up to 24% after 90 minutes. Na 2 S 2 O 4 is a strong reducing agent (Saikhao et al 2018), and therefore its addition could mitigate the severe damage to the bre from the subsequent oxidant treatment. As shown in Fig.…”

Section: Treatment With Kmnomentioning

confidence: 99%

WITHDRAWN: Effects of Various Decolorizing Agents on Waste Cotton Fabric Dyed with Reactive Dyes

Yang

et al. 2021

Preprint

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Shorter fashion cycles have led to the rapid accumulation of unwanted and waste textiles. Compared to light-coloured textiles, the dark-coloured ones are more difficult to recycle and reuse, and their incineration and landfilling have negative environmental consequences. A technology that sufficiently decolorizes these textiles without causing major damage to their structure and properties is therefore useful. In this study, a waste cotton fabric containing vinyl sulfone reactive dyes was subjected to chemical treatments with different oxidants and/or reducing agent. The effects of various treatments on the fabric’s coloration and mechanical properties were compared. The two-step treatment using first Na2S2O4 and then H2O2 showed the best performance, achieving a CIE whiteness index of 65.1, 19.3% tensile strength loss, 1.8% weight loss, 93.5% decolouration rate, and a degree of polymerization of 747.7. A mechanism was proposed to explain the synergistic decolorization process.

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Section: Treatment With Kmnomentioning

confidence: 99%

WITHDRAWN: Effects of Various Decolorizing Agents on Waste Cotton Fabric Dyed with Reactive Dyes

Yang

et al. 2021

Preprint

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“…Indigo is one of the most important dyes for cotton yarn dyeing; the annual global consumption is about 60,000 tons. 1,2 However, traditional indigo dyeing is usually done in a water bath. In such a process, cotton textiles need multiple pad dyeing (6˜10 times) to achieve a desired color depth.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Indigo Dyeing and Fixation Mechanism of Wet Rubbing Fastness Agent on Cotton Fiber in Silicone Non-Aqueous Dyeing System

Pei¹,

Luo²,

Gu³

et al. 2020

aatcc j res

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Indigo dyeing of cotton fiber in the silicone non-aqueous medium dyeing system was investigated to avoid the multiple dyeing of cotton yarn or fabric, high environmental pollution, and the need for multiple washing and sand washing. After fixing, the rubbing fastness of dyed fiber could be improved to 3–4 grade and the washing fastness increased 1–2 levels. The mechanism of rubbing fastness agents was also studied. Most of the wet rubbing fastness agents for indigo dyeing were waterborne polyurethanes. After fixation, a film was formed on the fiber surface. Moreover, the rubbing fastness was improved by the electrostatic interaction between the cellulosic fiber and indigo after treating with fixing agent. Indigo dyeing of cotton fiber was possible in the silicone non-aqueous dyeing system.

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“…In recent years, some new reduction methods have been studied, including biological reduction (Božič et al, 2009;Shin et al, 2016), electrochemical reduction (Roessler and Jin, 2003), catalytic hydrogenation pre-reduction (Blackburn et al, 2009) and application research of new reducing agents (Buscio and Gutiérrez-Bouz an, 2017). Among these new reducing agents, thiourea dioxide, ascorbic acid (Chavan, 2015), iron complexes (Chavan and Chakraborty, 2001), plant extracts (Hossain et al, 2016) and organic polyhydroxy compounds (such as glucose and a-hydroxy ketones) (Ben et al, 2014;Saikhao et al, 2018) have been studied in depth. NaBH 4 , as a common reducing agent, can achieve selective reduction of aldehydes or ketones, and is stable in alkaline solutions (Santos and Sequeira, 2011;Wang et al, 2016).…”

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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Green reducing agents for indigo dyeing on cotton fabrics

Cited by 81 publications

References 26 publications

WITHDRAWN: Effects of Various Decolorizing Agents on Waste Cotton Fabric Dyed with Reactive Dyes

WITHDRAWN: Effects of Various Decolorizing Agents on Waste Cotton Fabric Dyed with Reactive Dyes

Sustainable Indigo Dyeing and Fixation Mechanism of Wet Rubbing Fastness Agent on Cotton Fiber in Silicone Non-Aqueous Dyeing System

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

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