Development of new treatment methods for multi material textile waste

Jenull-Halver, Uta; Holzer, Clemens; Piribauer, Benjamin; Quartinello, Felice

doi:10.1063/1.5142985

Cited by 3 publications

(1 citation statement)

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“…[20,21] Importantly, the purified polyester fibers were structurally unaltered during the process. [20,22] Hydrolysis of cotton from different types of cotton/PET waste textile was also demonstrated by solid-state fungal fermentation, resulting in purified PET fibers. [23] The selectivity of enzymatic hydrolysis was further demonstrated by the step-wise recovery of amino acids and glucose from wool/cotton/PET mixed fabrics using proteases and cellulases, and recovering 96 % pure PET.…”

Section: Introductionmentioning

confidence: 99%

Solid‐State Enzymatic Hydrolysis of Mixed PET/Cotton Textiles**

et al. 2022

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Waste polyester textiles trap copious amounts of useful polymers, which are not recycled due to separation challenges and partial structural degradation during use and thermo-mechanical recycling. Chemical recycling of polyethylene terephthalate (PET) through depolymerization can provide a feedstock of recycled monomers to make "as-new" polymers, and reduce the accumulation of plastic waste in landfills. Enzymes are highly specific, renewable, environmentally benign catalysts, with hydrolases available that are active on common PET textile fibers and on cotton. The enzymatic PET recycling methods in development, however, have thus far been limited to clean, high-quality PET feedstocks, and most such processes require an energy-intensive melt-amorphization step ahead of enzymatic depolymerization. Here we report that high-crystallinity PET in mixed PET/cotton textiles can 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 is readily combined with cotton depolymerisation through simultaneous application of cellulase enzymes (CTec2®), providing up to 83 ± 4% yield of glucose without any negative influence on the TPA yield. The herein presented selective and/or simultaneous enzymatic hydrolysis of PET/cotton textiles in solid reaction mixtures can expand the biocatalytic recycling processes of PET to less-valuable waste materials, and significantly increase its profitability through operating at very high solid-loading (40%), without the need for melt-amorphization.

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Section: Introductionmentioning

confidence: 99%

Solid‐State Enzymatic Hydrolysis of Mixed PET/Cotton Textiles**

et al. 2022

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Mechanical, chemical, biological: Moving towards closed-loop bio-based recycling in a circular economy of sustainable textiles

Ribul

Lanot

Pisapia

et al. 2021

Journal of Cleaner Production

111

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Solid-state enzymatic hydrolysis of mixed PET-cotton textiles

Kaabel

Arciszewski

Borchers

et al. 2022

Preprint

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Waste polyester textiles trap copious amounts of useful polymers, which are not recycled due to separation challenges and partial structural degradation during use and thermo-mechanical recycling. Chemical recycling of polyethylene terephthalate (PET) through depolymerization can provide a feedstock of recycled monomers to make as-new polymers, and reduce the accumulation of plastic waste in landfills. Enzymes are highly specific, renewable, environmentally benign catalysts, with hydrolases available that are active on common PET textile fibers and on cotton. The enzymatic PET recycling methods in development, however, have thus far been limited to clean, high-quality PET feedstocks, and most such processes require an energy-intensive melt-amorphization step ahead of enzymatic depolymerization. Here we report that high-crystallinity PET in mixed PET/cotton textiles can 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% yield of TPA. The process is readily combined with cotton depolymerisation through simultaneous application of cellulase enzymes (CTec2), providing up to 83% yield of glucose without any negative influence on the TPA yield. The herein presented selective and/or simultaneous enzymatic hydrolysis of PET/cotton textiles in solid reaction mixtures can expand the biocatalytic recycling processes of PET to less-valuable waste materials, and significantly increase its profitability through operating at very high solid-loading (40%), without the need for melt-amorphization.

show abstract

Development of new treatment methods for multi material textile waste

Cited by 3 publications

References 0 publications

Solid‐State Enzymatic Hydrolysis of Mixed PET/Cotton Textiles**

Solid‐State Enzymatic Hydrolysis of Mixed PET/Cotton Textiles**

Mechanical, chemical, biological: Moving towards closed-loop bio-based recycling in a circular economy of sustainable textiles

Solid-state enzymatic hydrolysis of mixed PET-cotton textiles

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