Utilizing the oxygen-atom trapping effect of Co 3 O 4 with oxygen vacancies to promote chlorite activation for water decontamination

Heterogeneous high-valent cobalt-oxo [≡Co(IV)=O] is a widely focused reactive species in oxidant activation; however, the relationship between the catalyst interfacial defects and ≡Co(IV)=O formation remains poorly understood. Herein, photoexcited oxygen vacancies (OVs) were introduced into Co 3 O 4 (OV-Co 3 O 4 ) by a UV-induced modification method to facilitate chlorite (ClO 2 – ) activation. Density functional theory calculations indicate that OVs result in low-coordinated Co atom, which can directionally anchor chlorite under the oxygen-atom trapping effect. Chlorite first undergoes homolytic O–Cl cleavage and transfers the dissociated O atom to the low-coordinated Co atom to form reactive ≡Co(IV)=O with a…

• SU
  Shandong University
• NN
  National Natural Science Foundation of China

  Awards: BL01B, BL11B, U22A20423, 52270053, 52070121
• PU
  Peking University
• NS
  National Synchrotron Radiation Laboratory

  Award: BL01B
• BN
  Beijing Nova Program

  Awards: 20220484215, No. 20220484215
• NK
  National Key Research and Development Program of China

  Award: 2021YFA1202500
• BS
  Beijing Synchrotron Radiation Facility