Synthesis of Cobalt Hydroxide Nanosheets based on Sonication-induced Exfoliation for Depolymerization of Polyethylene Terephthalate

초록

In this work, ultrathin and two-dimensional (2D) cobalt hydroxide [Co(OH)(2)] nanosheets were synthesized by a sonication assisted liquid-phase exfoliation of bulk Co(OH)2. The resulting exfoliated Co(OH) 2 is a hexagonal mono-layered nanosheet with a high specific surface area of 27.5 m(2) g(-1). The depolymerization of polyethylene terephthalate (PET) based on glycolysis reaction was also performed using an exfoliated Co(OH)(2) catalyst. Excellent catalytic reaction performances were demonstrated; a high PET conversion and bis(2-hydroxyethyl) terephthalate (BHET) yield of both 100% using the nanosheet catalyst were achieved within a reaction time and temperature of 30 min and 200 degrees C, respectively. The long-term stability of exfoliated Co(OH)(2) catalysts was also demonstrated by recyclability tests of the catalyzed glycolysis reaction of PET over four cycles, showing both 100% of high PET conversion and BHET yield.

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