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.

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

The worldwide demand has been raised to use natural dyes in all applied fields of life due to their environmental-friendly and therapeutic nature. For the current study microwave rays as an eco-fri...

Eco-Friendly Isolation Of Colorant From Arjun Bark For Dyeing Of Bio-Mordanted Cotton Fabric

Environmental friendly bio-dyeing of silk using Alkanna tinctoria based Alkannin natural dye

Natural dye extracted from Mucuna slonaei F leaves (MSL) was used as green, sustainable and eco-friendly alternative in coloring cotton fabric with and without sodium chloride (NaCl), ferrous sulfate (FeSO4·7H2O) and alum (KAl(SO4)2·12H2O) as mordants. Effects of these mordants on color parameters (exhaustion (%), lightness (L∗), color axes (a∗ and b∗), hue angle (ho), color strength (K/S) and fastness properties evaluated) of MSL dyed cotton fabric were investigated. Flavonoids were identified as main chromophoric constituents in extracted MSL dye by UV–visible and Fourier transform infrared (FTIR) spectrophotometry techniques. Satisfactory color parameters in unmordanted MSL dyed fabric indicated that cotton fabric has a moderate affinity for the extracted dye. Metal pre-mordanting enhanced dye exhaustion by 4.85, 13.10 and 10% in Sodium chloride (Na+), ferrous sulfate (Fe2+) and alum (Al3+) dyed cotton fabrics respectively. Unmordanted MSL dyed fabric has lighter shade, higher L∗ and lower K/S value than metal salt pre-mordanted fabrics. The value of a∗ greater than b∗ and ho ​

Green, eco-friendly and sustainable alternative in dyeing cotton fabric using aqueous extract Mucuna slonaei F dye: effects of metal salts pre-mordanting on color strength and fastness properties

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.

Sustainable application of Cassia obovata-based chrysophanic acid as potential source of yellow natural colorant for textile dyeing.

In this study, the dyeing properties of a natural dye, extracted from the leaves of mimusops elengi Linn, on cotton and silk fabric were examined. Leaves are always an attractive choice as a raw ma...

A natural dye extracted from the leaves of Mimusops Elengi Linn and its dyeing properties on cotton and silk fabrics

There has been recently a worldwide interest in the production and application of natural dyes due to the growing awareness about cleaner surroundings and healthy lifestyle. The new sources of natu...

Excellent Dyeing Properties of a Natural Dye Extracted from the Leaves of Phoenix dactylifera Linn on Cotton and Silk Fabrics

http://www.cell.com/article/S2405844022029553/pdf

Shahin Hossain

Papers

A natural dye extracted from the leaves of Mimusops Elengi Linn and its dyeing properties on cotton and silk fabrics

Excellent Dyeing Properties of a Natural Dye Extracted from the Leaves of Phoenix dactylifera Linn on Cotton and Silk Fabrics

A low-density cellulose rich new natural fiber extracted from the bark of jack tree branches and its characterizations