Nanostructured micro particles as a low-cost and sustainable catalyst in the recycling of PET fiber waste by the glycolysis method
Artikel i vetenskaplig tidskrift, 2021

Magnetic Mg-Al-O@Fe3O4 micro particles were synthesized by coating nanosized Mg-Al double oxides
onto Fe3O4 micro particles. The formed hierarchical structure gave Mg-Al-O@Fe3O4 micro particles a high
active surface area, which enabled these micro particles to work efficiently as a catalyst in the glycolysis
of poly(ethylene terephthalate) (PET). The bis(hydroxyethyl) terephthalate (BHET) yield reached above
80 mol% in the presence of 0.5 wt% of Mg-Al-O@Fe3O4 micro catalyst in the reaction system within
90 min at 240 C. After the reaction, Mg-Al-O@Fe3O4 micro catalyst was easily retrieved by a magnetic
decantation and can be repetitively used for two times with a high catalytic efficiency. After that, the
deactivated Mg-Al-O@Fe3O4 micro catalyst can be regenerated by heat treatment. The regenerated Mg-
Al-O@Fe3O4 micro catalyst displays a comparable catalytic performance as that of the virgin catalyst.
In addition, the Mg-Al double oxides and Fe3O4 micro particles are low-cost and environmentally benign.
Therefore, the Mg-Al-O@Fe3O4 micro catalyst may contribute to an economically and environmentally
improved large-scale circular recycling of PET fiber waste.

PET fiber recycling

Sustainable catalyst


Nanostructured magnetic micro particles

Poly(ethylene terephthalate) (PET)


Zengwei Guo

RISE Research Institutes of Sweden

Erik Adolfsson

RISE Research Institutes of Sweden

Eric Tam

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Waste Management

0956-053X (ISSN)

Vol. 126 559-566


Produktionsteknik, arbetsvetenskap och ergonomi

Oorganisk kemi




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