Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 296, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2021.113267
Keywords
Polyethylene terephthalate; Glycolysis; Ionic solvents; Catalytic mechanism; Kinetic analysis
Categories
Funding
- National Key R&D Program of China [2019YFC1908204]
- Innovation Academy for Green Manufacture, Chinese Academy of Sciences [IAGM-2019-A06]
- K.C. Wong Education Foundation [GJTD-2018-04]
- National Natural Science Foundation of China [21878314, 21908232, 21776289, 21878292]
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This paper reviews the development history and recycling of PET, focusing on catalytic glycolysis as a promising method. It discusses the advantages and disadvantages of metallic catalysts and ILs, DESs, as well as the importance of glycolysis kinetics research.
This paper briefly reviews the development history of polyethylene terephthalate (PET) and the recycling of PET. As one of the most promising way to degrade PET into oligomers and monomers that can be used for the production of high-quality PET, catalytic glycolysis is highlighted in this review. The developments on metal salt, metal oxide and ionic solvent catalysts for glycolysis of PET are systematically summarized, besides, the proposed catalytic mechanisms of ionic liquids (ILs) and deep eutectic solvents (DESs) are presented. The metallic catalysts show high catalytic performance but causing serious environmental pollution and high waste treatment costs, thereby it is proposed that metal-free catalysts, especially ILs and DESs can be the greener alternatives to address the PET waste problem. Additionally, the studies related to the glycolysis kinetics are discussed in this review, showing the results that PET glycolysis process consists of heterogeneous and homogeneous depolymerization, and different models should be used to investigate different depolymerization stages in order to obtain a more realistic picture.
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