Eco-Friendly Dyeing of Cotton Fabric With Waste Tea Leaves Based Tannin Natural Dye

Abstract

<p>Natural products have always been appreciated due to the awareness about environmental standards for global health by using green technologies in their isolation and extraction. Thereupon natural dyes have been used in all fields due to having ecofriendly, therapeutic and aesthetic nature. For the current study, microwave radiations (MW) have been used as a green extraction tool to explore the natural coloring potency of Tea leaves for the dyeing of cotton fabrics. For isolation of natural dye from tea leaves in aqueous and basic media MW irradiation for 1-6 min has been given and used to dye cotton fabric. It has been evaluated that an increase in color yield (K/S) with the use of 6 min of microwave energy when basic extract of tea leaves was used to dye onto cotton fabric. It has been also revealed that in the case of the pre-mordanting method, 6% of Cu and 8% of Fe as a post mordanting method give the best fastness properties and the highest color yields. It is concluded that MW energy has an excellent ability for isolation of colorant from Tea leaves for dyeing of cotton fabric under reduced optimal dyeing conditions.</p>

Utilization of factory tea (Camellia sinensis) wastes in eco-friendly dyeing of jute packaging fabrics

“…Environmental risks include substances such as Cr3+, Cu2+, Ni2+, and Co2+ [ 8 , 9 ]. Tea leaves were microwave-treated for 6 min in an aqueous medium to extract natural dye, which was then utilized to eco-friendly dye cotton fabric [ 10 ]. The safflower (Carthamus tinctorius L.) color source combined with biomordants (turmeric and henna) was used in a quick and environmentally friendly microwave technique for both natural color extraction and fabric dyeing [ 11 ].…”

“…Tea ( C. sinensis ) is mostly composed of phenolic compounds, such as catechins and flavonoids and the flavonoid family contains therubigins and theaflavins, which are the principal natural dyeing agents used on natural fabrics [ 7 , [14] , [15] , [16] ].The main coloring pigment that gives fabrics their brown color is called catechin, which a naturally occurring pigment is found in tea leaves. Catechins include epicatechin (EC), epigallocatechin chin (EGC), epicatechingallate (ECG), and epigallocatechingallate (EGCG) [ 10 , 17 , 18 ]. The pigments of thearubigins are reddish-brown, whereas the pigments of theaflavins are yellowish-brown [ 16 ].…”

Influence of pH and fabric cationisation on functional properties of natural dyed cotton using extract from used tea bag

“…It provides good fastness properties [9]- [12]. It naturally contains tannin, which could also work as a mordant [13]- [15], although it may not be enough for the required fastness properties. Tea leaves contain amino acids, caffeine, carbohydrates, carotenoids, chlorophyll, lipids, minerals, nucleotides, organic acids, polyphenols, saponins, unsaponi able compounds and various volatile compounds [16].…”