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Vol. 36 No. 12 (2024): Vol 36 Issue 12, 2024

Copyright (c) 2024 Dhanalakshmi Ravikumar, Jeya Gopal, Sivamurugan Vajiravelu

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Closing the Loop on Polyester: A Green Approach to Chemical Recycling with Zn[L-Proline]2 Supported Kaolin Catalyst

Closing the Loop on Polyester
https://doi.org/10.14233/ajchem.2024.32662
Dhanalakshmi Ravikumar
Postgraduate and Research Department of Chemistry, Pachaiyappa’s College, Chennai-600030, India
https://orcid.org/0009-0000-2644-1697
Jeya Gopal
Postgraduate and Research Department of Chemistry, Pachaiyappa’s College, Chennai-600030, India
https://orcid.org/0009-0000-6881-1203
Sivamurugan Vajiravelu
Postgraduate and Research Department of Chemistry, Pachaiyappa’s College, Chennai-600030, India
https://orcid.org/0000-0002-9295-2118

Corresponding Author(s) : Sivamurugan Vajiravelu

sivaatnus@gmail.com

Asian Journal of Chemistry, Vol. 36 No. 12 (2024): Vol 36 Issue 12, 2024

Abstract

In present work, the depolymerization process utilizes kaolin-supported Zn[L-proline]2 (ZnP@K) as a recyclable Lewis acid catalyst, paving the way for the cost-effective production of recycled materials. The supported catalyst is characterized using FTIR, X-ray diffraction, SEM and BET analysis. The depolymerization of polyester textile waste, especially coloured threads, promoted by ZnP@K to yield more than 90% of monomers in pure form. In addition, irrespective of the colour of polyester threads, the process exhibited 100% conversion of polyester threads and obtained pure colourless monomers, bis(2-hydroxyethyl)terephthalate (BHET) and bis(2-hydroxyethyl)-terephthalamide (BHETA). The monomers are assessed for their structure and purity using FTIR, mass and NMR spectral techniques. While comparing with ZnO nanoparticles, ZnP@K depolymerized the polyester wastes in terms of yield and purity and it proved efficient and sustainable for recycling textile polyester waste.

Keywords

Aminolysis Chemical recycling Circular economy Glycolysis Kaolin Polyester
Ravikumar, D., Gopal, J., & Vajiravelu, S. (2024). Closing the Loop on Polyester: A Green Approach to Chemical Recycling with Zn[L-Proline]2 Supported Kaolin Catalyst: Closing the Loop on Polyester. Asian Journal of Chemistry, 36(12), 2772–2782. https://doi.org/10.14233/ajchem.2024.32662
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