Pre, Post and Meta Mordanting Recycled Cotton with Chitosan
Authors: Uysal Serkan , Bou-Belda Eva , Bonet-Aracil Marilés , Gisbert-Payá Jaime 
Published: June 2022

The textile processing industry has imposed strict ecological and economic restrictions on the chemicals used, including bans on certain consumer goods containing synthetic agents which are posing challenges to sustainability issues [1, 2]. The worldwide demand for the use of environmentally friendly products in the textile industry is nowadays of great interest, possibly because of increasing concern about the environment, ecology, and pollution control [3, 4].It is a fact that the textile industry has grown many times during the last decades to meet global and domestic demand. This tremendous growth has also led to a parallel growth in environmental problems, which remained unnoticed. Any industrial activity produces pollution in one form or the other, and the textile industry certainly released a wide spectrum of pollution into the environment.The textile manufacturing process is characterized by the high consumption of resources such as water, fuel and a variety of chemicals in a long process sequence which generates a significant amount of waste. The common practices of low process efficiency result in substantial wastage of resources and severe damage to the environment [5, 6].Recycling implies the breakdown of a thing into its unrefined materials with the end goal that the rough material can be recuperated and used as a piece of new items. On the other hand, recycle insinuates a present thing being used again inside a comparable creation chain. Textile material recycling is the strategy by which old pieces of clothing and diverse materials are recovered for recycle or material recovery. It is the explanation behind the material recycling industry. Material recycling may incorporate recouping pre-consumer waste or post-consumer misuse. There are different ways to deal with perceive the sorts of recycling possible inside the material [7].Pre-consumer waste is a material that was disposed of before it was prepared for customer utilize. Pre-consumer recycled materials can be separated and revamped into comparative or diverse materials or can be sold as such to outsider purchasers who at that point utilize those materials for buyer items. Pre-consumer material waste for the most part alludes to squander results from fiber, yarn, material, and clothing fabricating. It can be process closes, scraps, clippings, or merchandise harmed amid creation, and most is recovered and recycled as crude materials for the car, furniture, sleeping cushion, coarse yarn, home outfitting, paper, and different ventures. Pre-consumer squanders are produced all through the first phases of the inventory network. In the crude materials area (fiber and yarn creation), ginning squanders, opening squanders, checking squanders, comber noils, brushed waste yarns, meandering squanders, ring turning waste fibers, ring-spun squander yarns, open-end spinning waste fibers, and open-end spinning yarn squanders are usually gathered for recycling [8].The ground root of the madder plant, Rubia Tinctorum L., formerly cultivated in many parts of Europe and North and South of America. Was largely used for dyeing Turkey Red on cotton mordant with alum in presence of lime. Applied to wool on an alum- or chrome-cream of tartar mordent [9].Natural dyes with a few expectations are non-substantive and hence must be used in conjunction with mordants. Mordant is a chemical, which can fix itself on the fiber and combines with the dyestuff. The challenge before the natural dyers in application of natural colour is the necessity to us metallic mordants which themselves are pollutant and harmful. Due to the environmental hazard caused by metallic mordant while dyeing of textile fabric, dyers are always looking for safe natural mordant for natural dyes [10].The applications of chitosan for different applications in textiles are reported [11–12], but the application of such functional biopolymer as a mordant in natural dyeing has been quite rare in the literature. In the current work, chitosan extracted from waste shrimp shells [12] was utilized as a mordant for simultaneous natural dye printing and antibacterial finishing of cotton in comparison with commonly used metal mordants. The efficacy of chitosan as eco-friendly mordant and antibacterial finish has been studied.The paper discusses a comparison between different ways to mordant cotton with chitosan. This research as a first step of further experimental, provide us the optimum values and applications for the future research. As a result, we could conclude the mordanting process was more effective from the point of view of dyeing yield.