scholarly journals Eco-Friendly Vat Dyeing of Cotton Using Alkaline Iron (II) Salt as Reducing Agent

Tekstilec ◽  
2020 ◽  
Vol 63 (4) ◽  
pp. 305-320
Author(s):  
Omender Kr ◽  
◽  
J. N. Chakraborty ◽  
Keyword(s):  
Reduction Potential ◽  
Potential Surface ◽  
Cotton Fabrics ◽  
Sodium Sulphate ◽  
Reducing Agent ◽  
Vat Dyes ◽  
Box Behnken Design ◽  
Optimum Parameters ◽  
Colour Strength ◽  
Sulphate Sulphur

Sodium hydrosulphite is used commercially as the reducing agent for vat dyes in the dyeing of cotton. Large amounts of sodium sulphate, sulphur oxyanion and toxic sulphite are produced during the dyeing due to the dissociation of sodium hydrosulphite leading to severe air and water pollution. This research focuses on the use of alkaline iron (II) salt as the reducing agent for vat dyeing on cotton fabrics through a complete replace¬ment of hydrosulphite. The 34 Box-Behnken design was used to achieve optimum parameters and statistically analyse the performance of the new reducing system. The results showed that the alkaline iron (II) salt system was relatively effective in developing a comparable dyebath reduction potential, surface colour strength of cotton and colourfastness, if compared to the hydrosulphite-based reducing system. The dyebath stability in the presence and absence of the dye also showed superior results compared to that of the hydrosulphite system. Hence, it can be said that a complete substitution of sodium hydrosulphite with alkaline iron (II) salt is possible.

Cotton Dyeing with Vat Dyes using Alkaline Pectinase and Iron (II) Salt

2020 ◽  
Vol 7 (1) ◽  
pp. 10-20
Author(s):  
Veeresh MudnoorC ◽  
J.N. Chakraborty
Keyword(s):  
Water Pollution ◽  
Statistical Analysis ◽  
Sulfur Compounds ◽  
Alternative Formulation ◽  
Vat Dyes ◽  
Box Behnken Design ◽  
Optimum Parameters ◽  
Sodium Hydrosulfite ◽  
Analysis Of Performance ◽  
Cotton Dyeing

Use of sodium hydrosulfite in the dyeing of cotton with vat dyes is criticized for generation of sulfur compounds leading to air and water pollution. In this study, attempts were made to dye cotton with alkaline pectinase along with iron (II) salt as an alternative formulation. A 43 Box-Behnken design was used for statistical analysis of performance for this new reducing system and to obtain optimum parameters for cotton dyeing. The results showed that alkaline pectinase along with iron (II) salt was quite effective in developing comparable dyebath potential, dye receptivity on cotton with comparable dye strength, and colorfastness, as compared to the hydrosulfite-based reducing system. Dyebath stability in presence and absence of dye also showed superior results compared to that of the hydrosulfite system.

scholarly journals Development of antibacterial and UV protective cotton fabrics using plant food waste and alien invasive plant extracts as reducing agents for the in-situ synthesis of silver nanoparticles

Cellulose ◽  
2021 ◽  
Author(s):  
Nina Čuk ◽  
Martin Šala ◽  
Marija Gorjanc
Keyword(s):  
Silver Nanoparticles ◽  
Green Tea ◽  
Food Waste ◽  
Cotton Fabrics ◽  
Reducing Agent ◽  
Plant Food ◽  
Japanese Knotweed ◽  
Tea Leaves ◽  
Green Tea Leaves

Abstract The development of cellulose-based textiles that are functionalised with silver nanoparticles (AgNP), synthesised according to a green approach, and offer protection against ultraviolet (UV) radiation and pathogenic bacteria is very important today. In the present work we demonstrate the environmentally friendly approach to obtain such textile material by AgNP synthesis directly (in-situ) on cotton fabrics, using water extracts of plant food waste (green tea leaves, avocado seed and pomegranate peel) and alien invasive plants (Japanese knotweed rhizome, goldenrod flowers and staghorn sumac fruit) as reducing agents. The extracts were analysed for their total content of phenols and flavonoids and their antioxidant activity. The synthesised AgNP on cotton were round, of different size and amount depending on the reducing agent used. The highest amount of AgNP was found for samples where Japanese knotweed rhizome extract was used as reducing agent and the lowest where extracts of goldenrod flowers and green tea leaves were used. Regardless of the reducing agent used to form AgNP, all cotton samples showed excellent protection against E. coli and S. aureus bacteria and against UV radiation with UV protection factor values above 50. The best results for UV protection even after the twelve repetitive washing cycles were found for the sample functionalized with AgNP synthesised with an extract of the Japanese knotweed rhizome. Due to the presence of AgNP on cotton, the air permeability and thermal conductivity decreased. AgNP had no effect on the change in breaking strength or elongation of fabrics. Graphic abstract

scholarly journals Biosafety Evaluation and Quantitative Determination of Poly(hexamethylene biguanide) (PHMB) Coated on Cellulosic Fabrics by Kubelka-Munk Equation

2021 ◽  
Author(s):  
Wen-Yi Wang ◽  
Jia-Chi Chiou ◽  
Wan-Xue Chen ◽  
Jia-Li Yu ◽  
Chi-wai Kan
Keyword(s):  
Quantitative Determination ◽  
Cotton Fabrics ◽  
Bromophenol Blue ◽  
Blue Dye ◽  
Feasible Method ◽  
Colour Strength ◽  
Low Concentrations ◽  
Cellulosic Fabric ◽  
Biosafety Evaluation

Abstract It is a challenge to determine the quantity of cationic finishing agents on the surface of cellulosic fabrics. Herein, we report a direct and feasible method by Kubelka-Munk equation to quantify the cationic poly (hexamethylene biguanide) hydrochloride (PHMB) adsorbed onto cotton fabrics based on the principle of formation of a stable blue dye between PHMB and bromophenol blue sodium (BPB). The adsorption of PHMB onto cotton fabrics was first investigated and the maximum adsorption of PHMB was found to be around 8 mg per gram of cotton fabric. After being dyed with BPB, colour strength shows a positive correlation with PHMB at low concentrations (< 2400 mg/L). A linear relationship with a high correlation (C(PHMB) = (K/S—0.7411)/3.4517, R2 = 0.9983) was thus established between colour strength and PHMB concentration. However, this equation should fulfill four requirements for quantifying PHMB: (1) the distribution of PHMB on the surface of cellulosic fabric should be in the form of a monolayer with the content less than 5.3 mg/g; (2) an excess of BPB dyebath should be applied; (3) the dyeing should come to equilibrium; and (4) the fabrics should be evenly dyed. Moreover, MTT assay results indicate that excess PHMB coated on cotton fabrics can cause cytotoxicity and the quantity of PHMB should not exceed 4.62 mg per gram of cotton fabrics for the purpose of biosafety. The sample can be considered non-cytotoxic if the K/S value is lower than 13.2 after dyeing with BPB.

Antibacterial cotton fabrics with in situ generated silver and copper bimetallic nanoparticles using red sanders powder extract as reducing agent

2019 ◽  
Vol 24 (4) ◽  
pp. 346-354 ◽  
Author(s):  
Amara Venkateswara Rao ◽  
Basa Ashok ◽  
Mallavarapu Uma Mahesh ◽  
Gopireddy Venkata Subbareddy ◽  
Vatti Chandra Sekhar ◽  
...  
Keyword(s):  
Bimetallic Nanoparticles ◽  
Cotton Fabrics ◽  
Reducing Agent ◽  
Red Sanders ◽  
Powder Extract

scholarly journals The study of antibacterial activity and stability of dyed cotton fabrics modified with different forms of silver

2012 ◽  
Vol 77 (2) ◽  
pp. 225-234 ◽  
Author(s):  
Vesna Lazic ◽  
Zoran Saponjic ◽  
Vesna Vodnik ◽  
Suzana Dimitrijevic ◽  
Petar Jovancic ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Active Component ◽  
Silver Chloride ◽  
Cotton Fabrics ◽  
Negative Bacterium ◽  
Positive Bacterium ◽  
Vat Dyes ◽  
Artificial Sweat ◽  
The Stability

This study compares the effect of colloidal silver nanoparticles and commercial RUCO-BAC AGP agent with silver chloride as an active component on antibacterial activity of dyed cotton fabrics. Cotton fabrics were dyed with vat dyes Bezanthren olive T and Bezanthren grey FFB. Antibacterial activity of silver loaded dyed cotton fabrics was tested against Gram-positive bacterium Staphylococcus aureus and Gram-negative bacterium Escherichia coli. Unlike RUCO-BAC AGP synthesized silver nanoparticles deposited onto dyed cotton fabrics provided maximum bacteria reduction independently of applied dye. The stability of modified cotton fabrics was analyzed in artificial sweat at pH 5.5 and 8.0. Approximately the same amount of silver was released from differently modified cotton fabrics in artificial sweat. Larger amount of silver was released in the sweat at pH 8.0.

scholarly journals Sodium sulphate-sulphur dioxide chemimechanical process (SOX). V. Bagasse SOX pulp.

1985 ◽  
Vol 39 (5) ◽  
pp. 486-498
Author(s):  
Akio Mita ◽  
Takashi Saeki ◽  
Katsushi Sugiyarma ◽  
Yoshinori Yazawa ◽  
Takashi Kobayashi
Keyword(s):  
Sulphur Dioxide ◽  
Sodium Sulphate ◽  
Sulphate Sulphur

scholarly journals Sulphur Metabolism and Excretion Studies in Ruminants I. the Absorption of Sulphate in Sheep after Intratuminal or Intraduodenal Infusions of Sodium Sulphate

1971 ◽  
Vol 24 (4) ◽  
pp. 1319 ◽  
Author(s):  
PR Bird ◽  
RJ Moir
Keyword(s):  
Absorptive Capacity ◽  
Sodium Sulphate ◽  
Sulphur Metabolism ◽  
Apparent Absorption ◽  
Sulphate Sulphur ◽  
The Mean

The mean apparent absorption of sulphur when sodium sulphate was continuously infused into the rumen or the duodenum of four sheep in amounts of 1� 5, 3�0, and 6�0 g/day was 93 �1, 95�3, 95�9% and 93 �1, 92,8, 81� 5% respectively. The net absorptive capacity of the entire intestine under these conditions was calculated to be up to 5 g of sulphate sulphur daily.

Light fading, rub and wash fastness of sulphur-dyed cotton fabrics aftertreated with cation–tannin protective system

2020 ◽  
Vol 49 (6) ◽  
pp. 431-439
Author(s):  
Quratulain Mohtashim ◽  
Muriel Rigout ◽  
Sheraz Hussain Siddique
Keyword(s):  
Public Awareness ◽  
Cotton Fabrics ◽  
Reducing Agent ◽  
Fastness Properties ◽  
Sodium Sulphide ◽  
Content Type ◽  
Wash Fastness ◽  
Goods And Services ◽  
Protective System ◽  
The Impact

Purpose Sulphur dyes are the most highly consumed colourants for cellulosic substrates owing to their reasonable cost and acceptable fastness. However, the use of noxious conventional reducing agent, sodium sulphide and impaired wash fastness against oxidative bleaching is gradually decreasing the market of these dyes. As the need for “Green” goods and services is raising public awareness, this paper aims to use a glucose-based biodegradable reducing agent in place of sodium sulphide to dye cotton fabrics with a range of commercial sulphur dyes. The study also proposes an aftertreatment method to improve the fastness properties of the dyeing. Design/methodology/approach The paper investigated the impact of a newly developed aftertreatment method on the fastness properties of dyeing. This involved the sequential application of a cationic fixing agent (Tinofix ECO) and tannin (Bayprotect CL) on the coloured fabrics and subsequent evaluation of colour strength, washing, light and rubbing fastness. Findings The effect of aftertreating the dyed cotton was found to significantly improve the light and wet rub fastness. The surface morphology of the dyeing remained unaffected as depicted by the absence of any finish residues. Research limitations/implications The protective effect of the cation–tannin aftertreatments was examined with a view to providing the necessary commercial performance; however, it was established that the dry rub fastness was either reduced or remained unaffected and the wash fastness to International Organization for Standardization 105 C09 was also marginal. Originality/value This finishing technique is novel and can be found useful for manufacturing sulphur-dyed products with the improved light and wet rub fastness.

Sign in / Sign up

Export Citation Format

Share Document