Magnetic hollow micro-sized nanoaggregates for synergistically accelerating PET glycolysis

Abstract

The glycolysis of PET catalyzed by hollow micro-sized nanoaggregates is a highly effective and sustainable way to tackle the escalating plastic waste problem and create a circular plastic economy.

The controllable and efficient synthesis of two-dimensional metal–organic framework nanosheets for heterogeneous catalysis

“…47 The activated carbon cation is attacked by the –OH terminal group from EG molecules, which leads to the breakage of the carbon–oxygen single bond and the release of a repeat unit in PET. 30 The obtained intermediates are eventually converted to BHET dimers and monomers (Fig. S6†).…”

“…The dissolved monomer and oligomers were analyzed by high-performance liquid chromatography (HPLC) using the external standard method for the selectivity of BHET (eqn (S3)–(S6)†). 30,31…”

Polyethylene Terephthalate (PET) Recycled by Catalytic Glycolysis: A Bridge toward Circular Economy Principles

“…However, the utilization of a composite oxide derived from them, specifically ZnO-Fe 3 O 4 , in the form of magnetic hollow micro-sized nanoaggregates (HMNAs), revealed a synergistic effect. This resulted in a significantly ultrahigh monomer yield of 92.3% within a brief period of 30 min at 190 • C. This outcome surpassed the individual performances of ZnO and Fe 3 O 4 nanoparticles [175]. In the same study, various mixed oxides-based hollow micro-sized nanoaggregates (HMNAs), including CeO 2 -Fe 3 O 4 and ZIF-8-Fe 3 O 4 , were examined, revealing improved catalytic properties and recyclability [175].…”

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

“…3 PET glycolysis is a slow process in the absence of a catalyst and oen results in partially glycolyzed products instead of BHET. Catalysts reported for PET glycolysis can be categorized into metal derivatives, [6][7][8][9][10][11][12][13][14][15][16] ionic liquid (IL) based, [17][18][19] deep eutectic solvent (DES) [20][21][22][23][24] and organic catalysts. [25][26][27][28][29][30] Metal-based catalysts include metal salts, 31,32 metal oxides, 8,[33][34][35][36] metal-organic frameworks (MOFs), 37 metal nanoparticles, 6,[14][15][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][7][8][9][10][11][12][13][14][15][16] ionic liquid (IL) based, [17][18][19] deep eutectic solvent (DES) [20][21][22][23][24] and organic catalysts. [25][26][27][28][29][30] Metal-based catalysts include metal salts, 31,32 metal oxides, 8,[33][34][35][36] metal-organic frameworks (MOFs), 37 metal nanoparticles, 6,[14][15][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.…”