Green miles in dyeing technology: metal-rich pumpkin extracts in aid of natural dyes.

Mozhgan Hosseinnezhad,Kamaladin Gharanjig,Narjes Razani,Mohammad Reza Saeb,Razieh Jafari

doi:10.1007/s11356-022-19389-3

Mozhgan Hosseinnezhad, Kamaladin Gharanjig + Show 3 more

Open Access

https://doi.org/10.1007/s11356-022-19389-3

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Abstract

To reduce environmental pollution, it is essential to use green processes in dyeing and meet its requirements. Most natural dyes have a low affinity to be used in the dyeing process. To refine this limitation, the mordanting flow is necessary for many dyeing cases. Pumpkin extract as a natural, metal-rich source can be used as a bio-mordant in green dyeing of natural yarns such as wool. Two natural dyes native to Iran, Reseda luteola and madder, were employed in this study. The effectiveness of bio-mordant presence on yarns was evaluated by FTIR-ATR test from mordanted and mordanted-dyed wool samples. The study of K/S (color strength) content of dyed samples showed that increasing the dye concentration increases the amount of K/S. Fastness performance of wool dyed with pumpkin alternated from good to excellent depending on natural dye type and concentration, due to the formation of complex structures.

Highlights

To get a green dyeing, using natural mordant is very effective, but the search for an alternative having a higher stability and absorption interval, along with an absolute affinity towards natural fibers of various kinds was central to the focus of studies in the
Pumpkin extract as a natural source metal-rich can be used as a bio-mordant in green dyeing of natural fibers such as wool fibers
Fastness performance of wool dyes with pumpkin alternated from good to excellent depending on natural dye type and concentration, due to the formation of complex structures that compensated for the lack of affinity-characteristic of tannin-based first-generation biomordants, at best with good fastness

Summary

Introduction

Patents evidence that variety of materials, methods, and systems are born every day for the HITECH incentives. The orientation of technological developments towards sustainability needs are reflected more level headedly in the future picture of advanced systems enlivened by the scientists working in the era of energy harvesting materials. To come across requirements for a cleaner planet, green materials and technologies are developing too quickly, but still there are unsolved problems associated with materialization, mainly because of the materials used in manufacture of energy harvesting devices not being either efficient or environmental friendly. Dyeing process with green colorants has received a great deal of attention in recent decades. Because of their renewability and biodegradability, natural dyes are crucial elements in textile, food and drug coloration nowadays (Rather et al, 2016). Only a few among natural dyes could be directly applied in coloring procedure because of their low affinity towards textile fibers–what demands mordanting as compliment to dyeing process (Hadder et al, 2014).A mordant principally ties textile fibers with dyes by a coordination complex to compensate for the lack of affinity, but a few natural dyes yield good fastness properties, optimizing dyeing process remained an unsolved problem (Indi et al, 2016)

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