Aminolytic Depolymerization of Polyethylene Terephthalate Wastes Using Sn-Doped ZnO Nanoparticles

Poly(ethylene terephthalate) (PET) is one of the most consumed polymers because of its excellent thermal and mechanical properties. By increasing in PET production and since the disposal of PET waste has grown to be a major global environmental issue each year. Chemical recycling is the most success...

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Bibliographic Details
Published in:Journal of polymers and the environment 2022-09, Vol.30 (9), p.3566-3581
Main Authors: Vinitha, Viswanathan, Preeyanghaa, Mani, Anbarasu, Murugan, Jeya, Gopal, Neppolian, Bernaurdshaw, Sivamurugan, Vajiravelu
Format: Article
Language:English
Subjects:
Catalysts
Catalytic activity
Chemical recycling
Chemical synthesis
Chemistry
Chemistry and Materials Science
Circular economy
Crystallites
Crystals
Depolymerization
Doping
Environmental Chemistry
Environmental Engineering/Biotechnology
Ethanolamine
Fourier transforms
Industrial Chemistry/Chemical Engineering
Infrared spectroscopy
Materials Science
Mechanical properties
Nanoparticles
NMR
Nuclear magnetic resonance
Original Paper
Polyethylene
Polyethylene terephthalate
Polymer Sciences
Polymers
Soft drinks
Spectroscopy
Thermodynamic properties
Tin
Zinc oxide
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Summary:Poly(ethylene terephthalate) (PET) is one of the most consumed polymers because of its excellent thermal and mechanical properties. By increasing in PET production and since the disposal of PET waste has grown to be a major global environmental issue each year. Chemical recycling is the most successful method to achieve circular economy in the PET utilizing industries. Current research work aims to complete depolymerization of waste PET from soft drink bottles by the aminolysis method to produce bis (2-hydroxy ethylene) terephthalamide (BHETA) in the presence of Sn doped ZnO. To evaluate catalytic activity, Sn(II) doped ZnO nanoparticles prepared using different Sn(II) molar ratios at 0.5, 1.0 and 2.0 mol% and calcined at 500 °C for 1 h. The synthesized catalysts characterised using FT-IR, XRD, and UV–vis spectroscopy. The surface morphology and percentage doping obtained from SEM and SEM–EDS, respectively. We have observed a reduction in optical band gap and crystallite size of ZnO due to tin doping. Aminolytic depolymerization of PET waste using ethanolamine was promoted by Sn doped ZnO effectively under conventional thermal method. Increase in the yield of the BHETA observed with respect to increased doping percentage of Sn, and 1, 2 mol% Sn doped ZnO nanoparticles afforded over 90% of BHETA. Structure and purity of BHETA, depolymerised product was characterized by FT-IR, 1 HNMR, 13 C NMR, and MS. Graphical Abstract
ISSN:1566-2543
1572-8919
DOI:10.1007/s10924-022-02455-9