Eco-friendly Water-based Decolorization and PET Depolymerization for Effective Recycling of PET/Cotton Blend Fabric (II) - S-type Disperse Dyes and VS-type Reactive Dyes - 


Vol. 62,  No. 4, pp. 240-250, Aug.  2025
10.12772/TSE.2025.62.240


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  Abstract

This study aimed to enhance the chemical recycling efficiency of P/C blended fabrics dyed with three S-type disperse dyes and three VS-type reactive dyes. An ecofriendly aqueous decolorization process, employing sodium hydroxide and sodium hydrosulfite with acetone as an additive, was applied to remove the dyes prior to depolymerization. Decolorization tests on fabrics dyed at various concentrations showed that, for orange and red samples, deep-shade fabrics retained some residual color after treatment; however, overall decolorization rates exceeded 96.7%. In contrast, blue samples exhibited lower decolorization rates of 88.7–90.9%, indicating inferior decolorization performance. Depolymerization converted the PET component into terephthalic acid (TPA) monomer, while cotton remained as a solid, enabling fiber separation. The TPA yield of the undyed control sample was 81.7%, but P/C fabrics dyed in medium or deep shades showed a marked decrease to 59.6–66.5%. When dyed samples were decolorized prior to depolymerization, however, yields increased to 77.5–82.7%. These findings demonstrate that the dye removal effectively mitigates the negative effects of dyeing on depolymerization efficiency. This combined decolorization–depolymerization process is expected to be applicable to the recycling of other PET-based composite materials.

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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 (II) - S-type Disperse Dyes and VS-type Reactive Dyes -," Textile Science and Engineering, vol. 62, no. 4, pp. 240-250, 2025. DOI: 10.12772/TSE.2025.62.240.

[ACM Style]

성준규, 김성현, 이원준, and 이정진. 2025. Eco-friendly Water-based Decolorization and PET Depolymerization for Effective Recycling of PET/Cotton Blend Fabric (II) - S-type Disperse Dyes and VS-type Reactive Dyes -. Textile Science and Engineering, 62, 4, (2025), 240-250. DOI: 10.12772/TSE.2025.62.240.

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pISSN : 1225 - 1089
eISSN : 2288 - 6419

한국연구재단 우수등재학술지 유지 (2022년)