期刊
CHEMSUSCHEM
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202201613
关键词
biocatalysis; cotton; mechanoenzymatic hydrolysis; PET; textiles
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-2017-06467, SMFSU 507347-17]
- Fond de Recherche du Quebec Nature et Technologie (FRQNT) [PR 254169]
- Centre in Green Chemistry and Catalysis [FRQNT-2020-RS4-265155-CCVC]
- European Union's Horizon 2020 research and innovation program under the Marie Skodowska-Curie grant [101027061]
- Marie Curie Actions (MSCA) [101027061] Funding Source: Marie Curie Actions (MSCA)
This study demonstrates a direct and selective enzymatic recycling method for high-crystallinity PET in mixed PET/cotton textiles, which has been a challenge in previous studies, without any negative impact on the cotton recycling yield.
Waste polyester textiles are not recycled due to separation challenges and partial structural degradation during use and recycling. Chemical recycling of polyethylene terephthalate (PET) textiles through depolymerization can provide a feedstock of recycled monomers to make as-new polymers. While enzymatic PET recycling is a more selective and more sustainable approach, methods in development, however, have thus far been limited to clean, high-quality PET feedstocks, and require an energy-intensive melt-amorphization step ahead of enzymatic treatment. Here, high-crystallinity PET in mixed PET/cotton textiles could be directly and selectively depolymerized to terephthalic acid (TPA) by using a commercial cutinase from Humicola insolens under moist-solid reaction conditions, affording up to 30 +/- 2 % yield of TPA. The process was readily combined with cotton depolymerization through simultaneous or sequential application of the cellulase enzymes CTec2 (R), providing up to 83 +/- 4 % yield of glucose without any negative influence on the TPA yield.
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