Sustainable open and closed-loop cotton-polyester blended textile recycling using green solvent
Bolourieh, Nazila (2023)
Diplomityö
2023
School of Engineering Science, Kemiantekniikka
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2023060852861
https://urn.fi/URN:NBN:fi-fe2023060852861
Tiivistelmä
Increase in global consumption of clothing because of growth in population as well as fast fashion has led to production of a huge amount of textile waste which ends up in landfills or incinerated. This has become a challenge nowadays as increased environmental pollution and CO2 emissions are the results of the current system for handling textile waste. Chemical methods are gaining popularity among other methods of textile recycling, solvent-based recycling seems to be the most attractive way as it converts the waste textile back to the initial raw materials to reproduce the new garments. However, there might be challenges regarding the degradation of material in case of applying harsh conditions which can lead to low-quality textile production and this matter discourages the customers to purchase the recycled fabrics.
Therefore, several research attempts have been made so far, striving to resolve the above explained challenges. In the current study, we have assessed recycling of textile by utilizing deep eutectic solvent (DES) with a textile/DES ratio of 1:10 at 110 °C for 6 hours to separate the cotton and PET fraction of textile. Results were analyzed by FTIR, TGA, and XRD methods and were compared in terms of quantity and quality with the results of mildly pre-treated textiles treated in similar conditions of DES treatment. Moreover, membranes have also been prepared from cellulose and PET fractions to investigate the recovered fibre’s characteristics further. Generally, color stripping by nitric acid treatment worked quite well with jean fabric indigo dye, but it was not perfectly efficient in terms of other types of dye in textiles. The DES treatment resulted almost 95% of separation of cotton which seems encouraging that can be encouraging for application in industrial scale. By keeping conditions constant, the possibility of recycling solvent and its reuse has also been assessed for the sustainability purposes that led to promising result. The membranes casted from PET fraction were tighter and had lower permeability compared to cellulose membranes.
Therefore, several research attempts have been made so far, striving to resolve the above explained challenges. In the current study, we have assessed recycling of textile by utilizing deep eutectic solvent (DES) with a textile/DES ratio of 1:10 at 110 °C for 6 hours to separate the cotton and PET fraction of textile. Results were analyzed by FTIR, TGA, and XRD methods and were compared in terms of quantity and quality with the results of mildly pre-treated textiles treated in similar conditions of DES treatment. Moreover, membranes have also been prepared from cellulose and PET fractions to investigate the recovered fibre’s characteristics further. Generally, color stripping by nitric acid treatment worked quite well with jean fabric indigo dye, but it was not perfectly efficient in terms of other types of dye in textiles. The DES treatment resulted almost 95% of separation of cotton which seems encouraging that can be encouraging for application in industrial scale. By keeping conditions constant, the possibility of recycling solvent and its reuse has also been assessed for the sustainability purposes that led to promising result. The membranes casted from PET fraction were tighter and had lower permeability compared to cellulose membranes.