Synergistic effects of gamma irradiation on the PET surface and heat treatment of hydrotalcite catalyst supported by Pt/TiO2 nanoparticles on PET depolymerization rate

Acquiring new methods to achieve the products with lesser molecular weight associated with minimum energy consumption in poly(ethylene terephthalate) (PET) recycling can improve the glycolysis reaction performance. The synergistic effects of gamma irradiation on the properties of PET wastes and heat...

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Published in:Surface and interface analysis 2021-02, Vol.53 (2), p.215-229
Main Author: Bahramian, Alireza
Format: Article
Language:English
Subjects:
Ammonia
Catalysts
Catalytic activity
Degradation
degradation products analysis
Depolymerization
Energy consumption
Food irradiation
Gamma irradiation
Glycolysis
Heat treatment
hydrotalcite supported by NPs
Molecular weight
Nanoparticles
Oligomers
PET recycling
Polyethylene terephthalate
Reaction time
Recycling
Selectivity
Titanium dioxide
X ray photoelectron spectroscopy
yield and selectivity, heat treatment
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description Acquiring new methods to achieve the products with lesser molecular weight associated with minimum energy consumption in poly(ethylene terephthalate) (PET) recycling can improve the glycolysis reaction performance. The synergistic effects of gamma irradiation on the properties of PET wastes and heat treatment on the catalytic activity of novel hydrotalcite supported by 2‐wt% Pt/TiO2 nanoparticles (NPs) were studied. The PET samples treated by different gamma irradiation doses, γ, were degraded by glycolysis, which resulted in an increased yield of bis(2‐hydroxyethyl) terephthalate (BHET) monomer. The XPS analysis showed that the calcination temperature of the catalyst, T, affects the strength of the acid and/or basic sites of catalyst, degradation products, and reaction time. The NH3‐temperature‐programmed desorption (TPD) analysis showed the interaction between TiO2 and Pt led to a wide distribution of middle strength acid sites. Processing of PET by gamma irradiation showed that the average molecular weight of degradation products and reaction time decreased by increasing gamma dose. The composition (wt%) analysis indicated that the highest values of yield and selectivity of BHET were achieved in the optimum values of γ = 70 kGy and T = 450°C. The proposed procedure helps to attain minimize the residual oligomers and unreacted species during PET recycling.
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subjects Ammonia
Catalysts
Catalytic activity
Degradation
degradation products analysis
Depolymerization
Energy consumption
Food irradiation
Gamma irradiation
Glycolysis
Heat treatment
hydrotalcite supported by NPs
Molecular weight
Nanoparticles
Oligomers
PET recycling
Polyethylene terephthalate
Reaction time
Recycling
Selectivity
Titanium dioxide
X ray photoelectron spectroscopy
yield and selectivity, heat treatment
title Synergistic effects of gamma irradiation on the PET surface and heat treatment of hydrotalcite catalyst supported by Pt/TiO2 nanoparticles on PET depolymerization rate
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