Eco-friendly Water-based Decolorization and PET Depolymerization for Effective Recycling of PET/Cotton Blend Fabric (I) - E-type Disperse Dyes and Bifunctional Reactive Dyes - 


Vol. 62,  No. 4, pp. 229-239, Aug.  2025
10.12772/TSE.2025.62.229


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  Abstract

Decolorization of dyed PET/Cotton(P/C) blend fibers is a critical pre-treatment step that can significantly enhance the efficiency of chemical recycling of post-consumer PET/Cotton blend textiles. However, conventional dye extraction methods typically involve high-temperature treatment with organic solvents, which are costly and can generate toxic gases, leading to secondary environmental issues. In this study, we present a more environmentally benign decolorization method that substantially reduces the use of organic solvents. Decolorizing solutions were prepared with aqueous solution of sodium hydroxide and sodium hydrosulfite and adding acetone as an additive. Using this solution, P/C blend fabrics dyed with 3 disperse dyes and 3 reactive dyes were decolorized. Under optimized conditions, over 98.7% decolorization efficiency was achieved. When the decolorized P/C fabrics were subjected to a subsequent depolymerization, the cotton component could be separated and the PET component was depolymerized into terephthalic acid (TPA) monomer. The TPA yield from the decolorized P/C (77.5~80.5%) was significantly higher than that from the dyed P/C (55.1~68.5%). These results demonstrate that effective aqueous decolorization can substantially improve both the environmental and process efficiency of chemical recycling for dyed P/C blend fabric.

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  Cite this article

[IEEE Style]

성준규, 김성현, 이원준, 이정진, "Eco-friendly Water-based Decolorization and PET Depolymerization for Effective Recycling of PET/Cotton Blend Fabric (I) - E-type Disperse Dyes and Bifunctional Reactive Dyes -," Textile Science and Engineering, vol. 62, no. 4, pp. 229-239, 2025. DOI: 10.12772/TSE.2025.62.229.

[ACM Style]

성준규, 김성현, 이원준, and 이정진. 2025. Eco-friendly Water-based Decolorization and PET Depolymerization for Effective Recycling of PET/Cotton Blend Fabric (I) - E-type Disperse Dyes and Bifunctional Reactive Dyes -. Textile Science and Engineering, 62, 4, (2025), 229-239. DOI: 10.12772/TSE.2025.62.229.

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pISSN : 1225 - 1089
eISSN : 2288 - 6419

한국연구재단 우수등재학술지 유지 (2022년)