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Journal ArticleDOI

Ecofriendly application of coconut coir (Cocos nucifera) extract for silk dyeing

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.
Citations
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Journal ArticleDOI
TL;DR: In this article , the microwave-assisted isolation of Alkannin dye from Alkanna tinctoria followed by the dyeing of bio-mordanted silk was investigated, and it was observed that acid solubilized extract applied at 55 °C for 55 min having 7 g/100 mL of NaCl salt as the exhausting agent has given extraordinary higher color strength (K/S) onto microwave treatment treated silk fabric.

21 citations

Journal ArticleDOI
TL;DR: In this article, a green isolation tool, i.e., ultrasonic (U.S.) rays, was used to isolate colorant and applied onto fabric, and different dyeing parameters have been explored statistically through response surface methodology.
Abstract: Sustainability in all applied fields particularly in textiles is to protect our globe, environment, and community, where green dyed products are playing their role. For the current study, Esfand (Peganum harmala) has been explored using a green isolation tool, i.e., ultrasonic (U.S.) rays, and applied onto fabric. Different dyeing parameters have been explored statistically through response surface methodology by employing temperature (50-80°C), time (25-65 min), extract volume (15-55 mL), salt (1-5 g/100 mL), and dye bath pH (4-7) through series of experiments. For developing new shades, green mordants such as elaichi, neem, turmeric, and zeera have been utilized. It has been found that exposure of 35 mL extract of 7 pH containing 3 g/100 mL of salt as exhausting agent to U.S. rays for 30 min for the dyeing of silk at 70°C for 45 min has given maximum color strength with reddish-yellow shades. Color characteristics obtained in the CIE Lab system reveal that 5% of turmeric as meta bio-mordant has given good quality reddish-yellow shades. It is found that U.S. rays have not only good potential to isolate colorant followed by dyeing of silk under reduced condition but also the application of bio-mordants have made the process more greener, sustainable, and cleaner.

11 citations

Journal ArticleDOI
TL;DR: It can be concluded that US treatment being an environmentally safe means has only improved the color strength of colorant onto cotton fabric and the adding of bio-mordants has contrived the method more sustainable.

11 citations

Journal ArticleDOI
TL;DR: In this paper , the authors adopted a novel composite dye nanospheres modified with polyethyleneimine, which was further applied to the environmentally friendly dyeing of cotton fabrics.

11 citations

Journal ArticleDOI
TL;DR: In this paper , the waste tea-leaves-based tannin natural dye has been extracted under the influence of microwave treatment and employed onto bio-mordanted wool fabric.
Abstract: ABSTRACT Environmental issues are rising day by day in the global community due to the cumulative effects of hazardous effluent load and due to the introduction of biological active natural products into all aspects of life. In this study, the waste tea-leaves-based tannin natural dye has been extracted under the influence of microwave treatment and employed onto bio-mordanted wool fabric. For extraction of dye, microwave (MW) irradiation up to 6 min has been employed and for improvement in color strength, bio-mordants in comparison with chemicals mordants. It has been found that acidic extract of tea leaves after MW treatment for 6 min has given excellent color depth (K/S) on MW treated wool at 80°C. Using bio-mordants, it has been found that 4% of acacia extract, 1% of pomegranate extract and 5% of turmeric extract as pre bio-mordant, whereas 5% of acacia and 2% of pomegranate and turmeric as post bio-mordants have given excellent color strength, whereas in comparison, ferrous sulfate (2%) has given excellent results. It has been concluded that microwave treatment as an environmentally sustainable tool has not only improved the color strength of tannins dye onto wool fabric but also with the addition of bio-mordants has made the process more sustainable.

9 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the authors present an up-do-date review on natural fiber and resin types and sources, modification and processing techniques, physical and mechanical behaviors, applications, life-cycle assessment, and other properties of green composites.
Abstract: There has been much effort to provide eco-friendly and biodegradable materials for the next generation of composite products owing to global environmental concerns and increased awareness of renewable green resources. An increase in the use of natural materials in composites has led to a reduction in greenhouse gas emissions and carbon footprint of composites. In addition to the benefits obtained from green materials, there are some challenges in working with them, such as poor compatibility between the reinforcing natural fiber and matrix and the relatively high moisture absorption of natural fibers. Green composites can be a suitable alternative for petroleum-based materials. However, before this can be accomplished, there are a number of issues that need to be addressed, including poor interfacial adhesion between the matrix and natural fibers, moisture absorption, poor fire resistance, low impact strength, and low durability. Several researchers have studied the properties of natural fiber composites. These investigations have resulted in the development of several procedures for modifying natural fibers and resins. To address the increasing demand to use eco-friendly materials in different applications, an up-do-date review on natural fiber and resin types and sources, modification and processing techniques, physical and mechanical behaviors, applications, life-cycle assessment, and other properties of green composites is required to provide a better understanding of the behavior of green composites. This paper presents such a review based on 322 studies published since 1978.

393 citations

Journal ArticleDOI
TL;DR: This review summarizes major environmental and biological sources for natural colorants as well as nature-identical counterparts for naturally derived colorants.
Abstract: The color of food is often associated with the flavor, safety, and nutritional value of the product. Synthetic food colorants have been used because of their high stability and low cost. However, consumer perception and demand have driven the replacement of synthetic colorants with naturally derived alternatives. Natural pigment applications can be limited by lower stability, weaker tinctorial strength, interactions with food ingredients, and inability to match desired hues. Therefore, no single naturally derived colorant can serve as a universal alternative for a specified synthetic colorant in all applications. This review summarizes major environmental and biological sources for natural colorants as well as nature-identical counterparts. Chemical characteristics of prevalent pigments, including anthocyanins, carotenoids, betalains, and chlorophylls, are described. The possible applications and hues (warm, cool, and achromatic) of currently used natural pigments, such as anthocyanins as red and blue colorants, and possible future alternatives, such as purple violacein and red pyranoanthocyanins, are also discussed.

300 citations

Journal ArticleDOI
TL;DR: In this article, the solubility of silk fibroin in aqueous-salt and organic media has been analyzed and factors affecting the formation of the secondary structural organization of fiber in solutions and in the solid state after the recovery from solutions are analyzed.
Abstract: The solubility of silk fibroin in aqueous-salt, aqueous-organic, and organic media is analyzed. Factors affecting the formation of the secondary structural organization of fibroin in solutions and in the solid state after the recovery from solutions are analyzed.

196 citations

Journal ArticleDOI
TL;DR: In this article, the authors extensively review the dyes and chemicals utilized in the textile industry focusing on the traditional treatment methods for their removal from industrial wastewaters, and a critical analysis on Internet of Things based management systems for their remote monitoring and control of the water quality is reported.

142 citations

Journal ArticleDOI
TL;DR: The different types of dyeing processes, water consumption, pollution, treatment, and exploration of eco-systems in textile dyeing industry are explored.
Abstract: Color is a major attraction component of any fabric regardless of how admirable its constitution. Industrial production and utilization of synthetic dyestuffs for textile dyeing have consequently become a gigantic industry today. Synthetic dyestuffs have introduced a broad range of colorfastness and bright hues. Nonetheless, their toxic character has become a reason of serious concern to the environment. Usage of synthetic dyestuffs has adverse impacts on all forms of life. Existence of naphthol, vat dyestuffs, nitrates, acetic acid, soaping chemicals, enzymatic substrates, chromium-based materials, and heavy metals as well as other dyeing auxiliaries, makes the textile dyeing water effluent extremely toxic. Other hazardous chemicals include formaldehyde-based color fixing auxiliaries, chlorine-based stain removers, hydrocarbon-based softeners, and other non-biodegradable dyeing auxiliaries. The colloidal material existing alongside commercial colorants and oily froth raises the turbidity resulting in bad appearance and unpleasant odor of water. Furthermore, such turbidity will block the diffusion of sunlight required for the process of photosynthesis which in turn is interfering with marine life. This effluent may also result in clogging the pores of the soil leading to loss of soil productivity. Therefore, it has been critical for innovations, environmentally friendly remediation technologies, and alternative eco-systems to be explored for textile dyeing industry. Different eco-systems have been explored such as biocolors, natural mordants, and supercritical carbon-dioxide assisted waterless dyeing. Herein, we explore the different types of dyeing processes, water consumption, pollution, treatment, and exploration of eco-systems in textile dyeing industry.

110 citations

Trending Questions (3)
Is Mid (rachis) rib of coconut (cocos nucifera) as an alternative eco bag under agriculture?

The paper does not mention the use of the mid rib of coconut as an alternative eco bag under agriculture.

Mid rib of coconut (cocos nucifera) as an alternative eco bag introduction?

The paper does not mention the use of mid rib of coconut as an alternative eco bag introduction.

How can coconut coir eco bags be improved to be more sustainable and environmentally friendly?

Coconut coir can be used as a natural colorant for dyeing silk, and bio-mordants like turmeric can be employed to make the dyeing process more sustainable and clean.