Preparation of a Co3O4/Bi2MoO6 P-N-Type Heterojunction with Enhanced Photocatalytic Activity and Synergistic PMS Enrofloxacin Degradation

Graphical Co 3 O 4 /Bi 2 MoO 6 p-n type heterojunctions were successfully prepared by hydrothermal combined in-situ deposition. The degradation rate of enrofloxacin reached 87.84 % in 30 min under visible light irradiation with PMS (monoperoxysulfate). Thanks to the construction of the p-n heterojunction system and the activation of the PMS, the photogenerated charge carriers of the Co 3 O 4 /Bi 2 MoO 6 composite can be completely separated and transferred to produce active species with higher oxidation properties. On this basis, the photocatalytic mechanism of Co 3 O 4 /Bi 2 MoO 6 /PMS was explored. In this work, Co 3 O 4 /Bi 2 MoO 6 p-n-type heterojunctions were successfully fabricated via a hydrothermal method combined with in-situ deposition. The as-prepared samples were systematically characterized by means of SEM, TEM, XPS, XRD, etc. Through the synergistic effect of PMS (peroxosulfate monosalt), the obtained composite CB-2 has a superior degradation performance of enrofloxacin under visible light irradiation, and the degradation rate of enrofloxacin reaches 87.84 % within 30 min. The reaction process of enrofloxacin degradation was analyzed by 3D EEM (exception emission matrix spectrum) and LC–MS (liquid phase mass spectrometry). The influence of the reaction system on EFA degradation efficiency without PMS synergy and light was studied. The kind of free radical was determined from the outcome of the EPR and free radical capture experiment. Benefiting from the construction of the p-n heterojunction system and the activation of the PMS, the photogenerated carriers of the Co 3 O 4 /Bi 2 MoO 6 composite can be fully separated and transferred to produce active species with higher oxidative properties. Based on this, the photocatalytic mechanism of Co3O4/Bi2MoO6/PMS was explored.