Coloration of cotton fabric using watermelon extract: mechanism of dye-fiber bonding and chromophore absorption
TL;DR: In this paper, different approaches have been taken to develop a greener and sustainable cotton coloration process to reduce carbon footprint, natural compound as a colorant is an excellent alternative to the har...
Abstract: Different approaches have been taken to develop a greener and sustainable cotton coloration process to reduce carbon footprint. Natural compound as a colorant is an excellent alternative to the har...
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TL;DR: In this article, the authors used cocos nucifera as a source of natural colorants for coloration of bio-mordanted silk under the influence of ultrasonic radiations at various dyeing conditions.
Abstract: The worldwide resurgence of natural dyes in all fields is due to the carcinogenic effects of effluent loads shed by synthetic industries. Coconut coir (Cocos nucifera) containing tannin as a source of natural colorants has been selected for coloration of bio-mordanted silk under the influence of ultrasonic radiations at various dyeing conditions. For extraction of tannin dye from cocos powder, different media were employed, and dyeing variables such as dyeing time, dye bath pH, dyeing bath temperature, and the effect of salts on dyeing were optimized. For achieving new shades with excellent color characteristics, bio-mordants in comparison with chemical mordants were employed. It has been found that acid-solubilized extract after ultrasonic treatment for 45 min has yielded high color strength, when coconut coir extract of 4 pH from 6g of cocos powder, containing 5g/100mL salt solution as exhaust agent, was used to dye silk at 75°C for 65 min. Among bio-mordants turmeric (K/S=13.828) and among chemical mordants iron has shown excellent results (K/S=2.0856). Physiochemical analysis of fabric before and after US treatment shows that there is no change in the chemical structure of the fabric. It is found that ultrasonic waves have excellent potential to isolate the colorant followed by dyeing and environmental friendly mordanting at optimal conditions, but also the usage of herbal-based plant anchors, i.e., bio-mordants, has made the natural dyeing process more sustainable and clean.
29 citations
TL;DR: In this paper, the adsorption behavior of cacao husk extract dye in a D5 microemulsion system was investigated under conditions of varied dye mass (1-8% o.w.f), dyeing time (5-500min), and dyeing temperatures (333-373 K).
Abstract: Natural dyes exhibit a low dye uptake when cellulosic fiber dyeing is carried out using a conventional water bath dyeing process. In this research, cotton fabric was exhaust dyed in a microemulsion dyebath containing cacao husk extracts dye and decamethylcyclopentasiloxane (D5) to achieve higher dye exhaustion percentage on cotton fiber, which is an environmentally beneficial dyeing process. The adsorption behavior of cacao husk extract dye in a D5 microemulsion system was investigated under conditions of varied dye mass (1–8% o.w.f), dyeing time (5–500 min), and dyeing temperatures (333–373 K). Kinetic modelling of cacao husk extracts dye/D5 adsorption on cotton fiber was studied by fitting experimental data to pseudo first-order and pseudo second-order kinetics, and the intraparticle diffusion model. Early results indicated that the kinetic model of adsorption of cacao husk extracts dye on cotton fiber followed the pseudo second-order model. Langmuir, Freundlich, and Dubinin–Radushkevich adsorption isotherm models were employed to analyze the adsorption isotherms, and the results showed that the adsorption process fit well with the Langmuir model compared to the Freundlich isotherm. The mean adsorption energy from the Dubinin–Radushkevich isotherm model implied that adsorption of the cacao husk extracts onto cotton was accompanied with a physical process. The values of standard enthalpy (ΔH° > 0), standard entropy (ΔS° > 0), and Gibbs free energy (ΔG° < 0) strongly reflected that the adsorption of the cacao husk extracts onto cotton was thermodynamically favourable and feasible. Thus, waterless dyeing of cotton fabric using a natural dye/D5 system explores a sustainable dyeing technology with higher dye exhaustion percentage.
28 citations
TL;DR: In this paper, the authors used cacao husk extracts as a natural dye in the decamethylcyclopentasiloxane (D5) medium for the dyeing of cotton fabric, and subsequently, the dyed cotton was treated by a fixation treatment with a cationic dye-fixing agent in the D5 medium.
Abstract: Textile dyehouses are under scrutiny because they discharge colored and hazardous effluents to waterways. There is a need to develop an alternative dyeing system that does not produce any hazardous effluent. The waterless dyeing method could be a viable eco-friendly alternative to the traditional aqueous dyeing method. In this work, cacao husk extracts were used as a natural dye in the decamethylcyclopentasiloxane (D5) medium for the dyeing of cotton fabric, and subsequently, the dyed cotton was treated by a fixation treatment with a cationic dye-fixing agent in the D5 medium. The cotton fabric dyed with cacao husk extracts exhaustion in the waterless D5 medium exhibited better exhaustion, fixation rate, color strength (K/S), and colorfastness to washing and rubbing compared to the fabric dyed with the same extracts using the conventional aqueous dyeing and dye-fixing methods. The dye exhaustion percentage and the dye fixation rate were 95.6% and 94.8% in the D5 medium respectively, which is significantly higher in comparison to a 48.2% dye exhaustion percentage and a 35.3% dye fixation rate in the conventional water medium. An orthogonal array design (L9) was adopted to optimize the dyeing conditions with respect to exhaustion percentage. The results indicated that the dyebath temperature was the most important factor for achieving the optimal dye exhaustion, and dyeing time also showed considerable effects. Linear regression was used to predict the exhaustion percentage, and the resulting p value of 0.000 demonstrated that a strong coefficient was proven among all selected factors. This study has demonstrated that dyeing of cotton fabric with cacao husk extracts in the D5 dyeing system can be a viable method for the textile industry with minimal environmental pollution.
24 citations
01 Jul 2021
TL;DR: In this article, the use of Turmeric extract as a usefull dye source and Citrus lemon, Colocasia esculenta bulk extract as biomordant could reckon a positive insight for cleaner textile manufacturing and dyeing.
Abstract: Textile coloration using synthetic dyes is not eco-friendly and has detrimental impact on wearer skin. Hence, natural dye is assumed as a suitable alternative for sustainable textile manufacturing and coloration. In this study, we utilized Turmeric (Curcuma longa L.) extract for cotton fabric dyeing. Additionally, biomordants (derived from Citrus lemon and Colocasia esculenta bulk) and metallic mordants (Potassium dichromate and Potash alum) pre-treatments were carried out to upturn the overall uptake of dyes into the fabric interior. The resulted color-strength (K/S) of biomordant pretreated sample was two times higher (K/S=8.6) than the metal mordanted sample (K/S=4.0). To investigate the fastness properties of dyed fabric varities, colorfastness to rub (dry and wet), wash, water, and perspiration test were performed and found superior result for bio-crosslinkers compared to metallic salts chelation. Futhermore, the visual uniformity and moisture absorption on the hue (h*) by the final dyed samples were also found excellent in both mordanted dyed fabrics. Thereby, this dyeing process propossed the viability of natural dyestuff with synthetic auxiliaries for facile cotton fabric coloration. Therefore, the utilization of Turmeric extract as a usefull dye source and Citrus lemon, Colocasia esculenta bulk extract as biomordant could reckon a positive insight for cleaner textile manufacturing and dyeing.
23 citations
TL;DR: In this article, a facile structural modification of cellulosic fabric (cotton) by applying two different polyphenol enriched extracts derived from the banana floral stem (BFS) and watermelon rind (WR) for imparting UV protective functionality was reported.
14 citations
References
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TL;DR: In this article, a review of infrared and Raman spectroscopic methods applied to the analysis of valuable plant substances or quality parameters in horticultural and agricultural crops is presented.
765 citations
Book•
22 Jun 2007
TL;DR: In this article, the authors set out to record sources of colorants discovered and used on all the continents from antiquity until the present day, including 300 plants and 30 animals (marine molluscs and scale insects) illustrated and discussed by the author, whose passion for natural dyes has taken her across the globe in search of dye sources and dyers.
Abstract: At a time when more and more plants and animals are threatened with extinction, this book sets out to record sources of colorants discovered and used on all the continents from antiquity until the present day. Some 300 plants and 30 animals (marine molluscs and scale insects) are illustrated and discussed by the author, whose passion for natural dyes, with their colours of unequalled richness and subtlety, has taken her across the globe in search of dye sources and dyers. Botanical or zoological details are given for each source and the chemical structures shown for each dye. Dyes employed by different civilisations, identified by dye analyses, are illustrated and relevant historical recipes and detailed descriptions of dyeing processes by traditional dyers are quoted and explained in the light of modern science. Other current uses of such colorants, e.g. in medicine and for food and cosmetics, are also noted. Although natural dyes have been replaced largely by synthetic dyes, increasing worldwide awareness of the harmful consequences of the pollution resulting from the production and use of some synthetic colorants has led to a significant revival and renewed interest in natural colorants. As potential renewable resources, natural dyes are an integral part of the major issue of our time, namely sustainable development. The aim of this book is to provide a scientific background for this important debate.
303 citations
TL;DR: Results indicate that watermelon rind, an underutilized agricultural waste, offers a source of natural citrulline, which is used in the nitric oxide system in humans and has potential antioxidant and vasodilatation roles.
282 citations
TL;DR: Two-stage ultrasonic dyeing of cotton and silk fabrics with natural dyes, Terminalia arjuna, Punica granatum, and Rheum emodi have been developed in which an enzyme is complexed with tannic acid first as a pretreatment as discussed by the authors.
190 citations
TL;DR: In this article, the degradation kinetics of chlorophylls in spinach puree were studied from 100 to 145°C (2-25 min) and from 80 to 115°C(25-39 min) for chlorophyl compounds, respectively, with an isokinetic temperature of 1608°C.
Abstract: Thermal degradation of chlorophylls and chlorophyllides in spinach puree was studied from 100 to 145°C (2–25 min) for chlorophylls and from 80 to 115°C (25–39 min) for chlorophyllides The derivatives formed were: pheophorbides, pyropheophorbides, pheophytins and pyropheophytins Degradation kinetics of chlorophylls and chlorophyllides followed a first-order kinetic model Reaction rate data showed that the a form of both chlorophylls and chlorophyllides degraded more rapidly than the b form Chlorophyllides were less stable than chlorophylls Activation energies ranged from 150 to 228 Kcal/mol A kinetic compensation effect was observed for both chlorophylls and chlorophyllides with an isokinetic temperature of 1608°C The relative stability of these compounds suggests that methods to maximize chlorophyllides would not be effective for improving green color stability
138 citations