Synthesis of metal nanoparticles for use as nanocatalysts in pet recycling

Abstract

This study investigated the efficiency of nickel nanocatalysts in the degree of PET conversion, under different conditions. The nanocatalysts were synthesized by the Pechini method at 500, 700 and 900ºC. PET depolymerization, via chemical glycolysis, was tested with varying time (3, 4 and 5 hours) and amount of catalyst (10, 35 and 60 mg). In order to evaluate the efficiency of these catalysts in PET depolymerization reactions, we followed a 2 3 factorial design with central point and applied a statistical analysis of variance (ANOVA). To optimize the degree of PET conversion, it was suggested to use 10 mg catalyst with 5h reaction time. Nickel nanocatalysts presented satisfactory results due to the possibility of using small amounts of catalyst, synthesized at low temperature, thus achieving a degree of conversion greater than 90%.

Occurrence, toxicity and remediation of polyethylene terephthalate plastics. A review

“…Bis(2-hydroxyethyl) terephthalate was the main product found after PET degradation using the nanocatalystperkalite F100 (Guo et al 2018 ). Rezende et al ( 2019 ) synthesized the nickel catalyst, thus achieving a 97% degree of conversion. Fe 3 O 4 nanoparticle was immobilized on boron nitride nanosheets to recycle PET wastes by glycolysis (Nabid et al 2019 ).…”

Co-Al-CO3 layered double hydroxide: an efficient and regenerable catalyst for glycolysis of polyethylene terephthalate

“…PET glycolysis is a slow process in the absence of a catalyst and often results in partially glycolyzed products instead of BHET. Catalysts reported for PET glycolysis can be categorized into metal derivatives, 6–16 ionic liquid (IL) based, 17–19 deep eutectic solvent (DES) 20–24 and organic catalysts. 25–30 Metal-based catalysts include metal salts, 31,32 metal oxides, 8,33–36 metal–organic frameworks (MOFs), 37 metal nanoparticles, 6,14–16,38 metal oxide doped graphene 11,39 , CNTs 40 and layered double hydroxides (LDHs).…”

“…Catalysts reported for PET glycolysis can be categorized into metal derivatives, 6–16 ionic liquid (IL) based, 17–19 deep eutectic solvent (DES) 20–24 and organic catalysts. 25–30 Metal-based catalysts include metal salts, 31,32 metal oxides, 8,33–36 metal–organic frameworks (MOFs), 37 metal nanoparticles, 6,14–16,38 metal oxide doped graphene 11,39 , CNTs 40 and layered double hydroxides (LDHs). 41 Ionic liquids have emerged as green catalysts, but they suffer from low BHET yield and difficulty in catalyst regeneration.…”

desafios do uso ambientalmente sustentável de plásticos

“…Even so, plastics degradation represents an extremely time-consuming process, physically, chemically or biologically. Chemical methods have been developed aiming at plastic degradation by using nanocatalysts to decompose polymeric compounds, with positive results (Alzuhairi et al, 2017;Guo et al, 2018;Rezende et al, 2019;Nabid et al, 2019). On the other S&G Journal Volume 17, Number 1, 2022, pp.…”