(510c) Cobalt-Based ZIF Coordinated Hybrids with Defective TiO2-x Forboosting Visible Light-Driven Photo-Fenton-like Degradation of Bisphenol a

Designing heterostructure of photocatalyst as an efficient approach to boost visible light-driven photocatalytic
degradation, we prepared a series of cobalt-based ZIF coordinated with defective TiO_2-x,
denoted as B-TiO_2-x@ZIF-67 composites, through wrapping defective B-TiO_2-x on ZIF-67 for promoting
photocatalytic degradation efficiency of biphenyl A. The B-TiO_2-x@ZIF-67 composites displayed superior
photocatalytic performance to pure TiO_2-x or ZIF-67 because of faster separation of photogenerated
charge carriers and more suitable redox potentials. Such a novel photo-Fenton-like system composed of
B-TiO_2-x@ZIF-67/H₂O₂/visible light accelerated the peroxidative degradation of biphenyl A up to a
removal efficiency of 95.30%, which is also higher than that of photocatalysis or Fenton-like reaction
alone. In addition, the degradation efficiency of biphenyl A is unchanged after catalyst reuse of four
cycles. Integrating the trapping experiments and electrochemical analysis, we found the oxygen vacancy
on BeTiO_2-x capturing the electrons to promote the separation of photogenerated charges, meanwhile
the Co(II) in the composite decomposed hydrogen peroxide (H₂O₂) to produce more OH radical. Both of
them mutually boosted the removal efficiency. Finally, feasible degradation pathways of biphenyl A were
proposed based on the assay of LC-MS spectrometry. This strategy offers a novel insight into fabrication
of Co-ZIF-based TiO_2-x materials and application to visible light-driven photocatalytic and Fenton-like
degradation reaction.