Different CoO-Co₃O₄/carbon nanocomposites derived from -cyclodextrin-Co(II) for Bisphenol A removal

The CoO-Co3O4/C and CoO-Co3O4/N-C composites were synthesized from beta-cyclodextrin (CD)-cobalt acetate and beta-CD-Zeolitic imidazolate framework-67 (ZIF-67) via adduct and coordination interactions, respectively. The transformation of the composition and structure of their precursors as well as the composites were studied. The two composites were employed as catalysts for the oxidative degradation of Bisphenol A in the presence of potassium persulfate. The catalytic results confirmed that the CoO-Co3O4/C and CoO-Co3O4/N-C composites demonstrated about 5.2 and 3.7-fold higher degradation rates than that of Co3O4 obtained by cobalt acetate, respectively, and also displayed a robust reusability, which could be due to the unique oxidation-reduction property between CoO and Co3O4 and the small particle size of cobalt oxides with carbonaceous species. The possible degradation mechanism was also investigated by controlled experiments. This work provided new development for the synthesis of functional materials by the assistance of supramolecules as well as their potential applications in the environmental catalysis. [Graphics]