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Gewählte Publikation:

Quartinello, F; Vajnhandl, S; Valh, JV; Farmer, TJ; Voncina, B; Lobnik, A; Acero, EH; Pellis, A; Guebitz, GM.
(2017): Synergistic chemo-enzymatic hydrolysis of poly(ethylene terephthalate) from textile waste
MICROB BIOTECHNOL. 2017; 10(6): 1376-1383. FullText FullText_BOKU

Abstract:
Due to the rising global environment protection awareness, recycling strategies that comply with the circular economy principles are needed. Polyesters are among the most used materials in the textile industry; therefore, achieving a complete poly(ethylene terephthalate) (PET) hydrolysis in an environmentally friendly way is a current challenge. In this work, a chemo-enzymatic treatment was developed to recover the PET building blocks, namely terephthalic acid (TA) and ethylene glycol. To monitor the monomer and oligomer content in solid samples, a Fourier-transformed Raman method was successfully developed. A shift of the free carboxylic groups (1632cm(-1)) of TA into the deprotonated state (1604 and 1398cm(-1)) was observed and bands at 1728 and 1398cm(-1) were used to assess purity of TA after the chemo-enzymatic PET hydrolysis. The chemical treatment, performed under neutral conditions (T=250 degrees C, P=40bar), led to conversion of PET into 85% TA and small oligomers. The latter were hydrolysed in a second step using the Humicola insolens cutinase (HiC) yielding 97% pure TA, therefore comparable with the commercial synthesis-grade TA (98%).
Autor/innen der BOKU Wien:
Gübitz Georg
Quartinello Felice
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