Functional modification of cellulose by chitosan and gamma radiation for higher grafting of UV protective natural chromophores
TL;DR: In this paper, a green functionalization process of a cellulose substrate by combining the chitosan treatment and gamma radiation was demonstrated, where natural chromophores derived from Banana floral stem (BFS) was grafted in the functionalized cellulose surface.
About: This article is published in Radiation Physics and Chemistry.The article was published on 2021-06-01. It has received 11 citations till now. The article focuses on the topics: Cellulose.
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TL;DR: In this article , the authors provide a comprehensive summary of recent research findings on cotton modifications in the context of progress towards enhancing the natural dyeing performances in terms of colourimetric, fastness and other functional properties.
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
15 citations
TL;DR: In this article, it has been found that C. obovata has an excellent potential for coloration of surface modified fabrics, where the application of low amount of bio-mordants under statistical optimized conditions has made process more ecological, economical, and sustainable.
Abstract: In the current pandemic scenario, sustainable green products particularly antiviral, antioxidant, and antibacterial in nature are gaining worldwide fame in almost every walk of life. Cassia obovata (C. obovata) has been valorized as a source of yellow natural dye for nylon dyeing. For the isolation of dye extracts and for surface tuning, nylon fabrics were treated with microwave rays up to 10 min. For getting new shades with good to excellent fastness characteristics, sustainable bio-mordants in comparison with chemical mordants have been used at 60 °C, 70 °C, and 80°C. It has been found that for getting effective colorant yield, acidic extract should be exposed to MW ray treatment up to 6 min, and for getting improved fastness rating, bio-mordants have given excellent color characteristics. Statistical optimization of dyeing variable shows that application of 40 mL of C. obovata acidic extract of RE of 6 pH containing 3 g/100 mL of salt when employed at 55 °C for 45 min has given excellent results onto irradiated nylon fabric (RNF). It is inferred that Cassia obovata has an excellent potential for coloration of surface-modified fabrics, where the application of low amount of bio-mordants under statistical optimized conditions has made process more ecological, economical, and sustainable.
9 citations
TL;DR: In this paper, a sustainable comparative cotton dyeing mechanism of condensed and hydrolyzable tannin enriched extracts by exploiting watermelon rind (WR) and mango seed kernel (MSK) bio-waste was reported.
Abstract: This study reported a sustainable comparative cotton dyeing mechanism of condensed and hydrolyzable tannin enriched extracts by exploiting watermelon rind (WR) and mango seed kernel (MSK) bio-waste. Both crude dye extracts possess various coloring chromophores such as flavonoid, betacyanin, quercetin, β -carotene together with condensed and hydrolyzable tannin at a different level of concentrations, which were confirmed by several phytochemical screenings, thin layer chromatography, and UV spectroscopy. At optimized reaction condition, the resulted fixation rates of various WRCs (at 60 ° C for 60 min) and MSKCs (at 90 ° C for 60 min) were found as 25%–75% and 55%–71%, respectively. MSKCs have higher absorbance intensity and proactive anchoring sites than those of WRCs, resulting in three times higher color strength (K/S). For promoting the dye fixation, cotton fabric samples were chelated with different types of metallic salts (Fe2＋, Al3＋, Sn 2 + , and Cu 2 + ) and 65% and 45% enhanced color strength was found for WRCs (K/S increased from 0.95 to 1.57) and MSKCs (K/S increased from 2.75 to 3.98), respectively. The effects of metal chelation with cellulose chain were estimated in terms of several crystallinity indices, hydrogen bonding configurations, and asymmetric factor and elaborately correlated with the improved dye fixation. In addition, the electrolyte was also added to the dye bath for further improvement of dye exhaustion, thereby granted 12% and 6% higher color depth for WR (K/S increased from 1.57 to 1.76) and MSK dyed fabric (K/S increased from 3.98 to 4.23). Finally, distinguishing colorimetric appearances and excellent colorfastness properties were ensured for different tannin classes.
6 citations
References
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TL;DR: In this article, a review encompasses a summary of research performed in last 15 years (1998-2013) in different arenas of applications of natural dyes, with specific reference to technological development in natural textile dyeing and use of natural Dyes in functional finishing of textiles, food coloration and dye-sensitized solar cells.
681 citations
TL;DR: Highlights • Extraction methods of nanocellulose, surface modification of cellulose fibers, and latest patents trends on cellulose nanocomposites.
399 citations
TL;DR: The radiation chemistry of cellulose, the different grafting techniques used, and the methods of characterization of the grafted material are discussed in this article. And the application of the grafting polymer for the removal of water pollutants and regeneration of the adsorbent is discussed.
184 citations
TL;DR: A new cotton fiber with a chitosan coating (CCCF) was prepared by the oxidation of a cotton thread with potassium periodate at 60°C in water and subsequent treatment with a solution of chitosa in aqueous acetic acid as mentioned in this paper.
147 citations
TL;DR: Analysis of crystallinity changes in cellulose using CBMs offers a new and advantageous method of qualitative and quantitative assessment of changes to the structure of cellulose that occur with sodium hydroxide treatment.
147 citations