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Autocatalytic Depolymerization for Polyester Blended Textiles Waste
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DOI：10.1039/D6GC02186G.png)
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Abstract
En 中文
Post-consumer blended textiles pose major challenges for recycling due to the coexistence of multiple fiber types; dyes; and other contaminants. Here; we report an autocatalytic strategy that enables efficient glycolysis of polyester blended textiles containing zinc pyrithione antimicrobial agents. Unlike conventional glycolysis; which proceeds through intermolecular nucleophilic substitution; zinc pyrithione coordinates with polyester chains and ethylene glycol at its zinc and oxygen atoms; promoting intramolecular ester bond cleavage. This autocatalytic pathway delivers reaction rates markedly higher than those obtained with state-of-the-art homogeneous catalysts. This method enables staged depolymerization of polyester/cotton/spandex blended textiles while preserving the structure of the cotton fibers. Life-cycle assessment reveals significantly reduced environmental impacts compared with BHET petroleum-derived routes; and techno-economic analysis confirms the economic viability of the process. These results highlight a practical and sustainable approach for the chemical recycling of post-consumer polyester-blended textile waste.
Keywords:
Autocatalytic depolymerization
Polyester blended textiles
Chemical recycling
Zinc pyrithione
Sustainable waste management