Visible-light-driven activation of peroxymonosulfate for accelerating ciprofloxacin degradation using CeO2/Co3O4 p-n heterojunction photocatalysts

By Chunhui Shen, Xiaoju Wen, Z. Fei, Zongtang Liu, Qi-Ming Mu. Chemical Engineering Journal, 2020

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Abstract The development of simple and effective approaches for the synthesis of bimetallic oxide heterojunction photocatalyst which are used to activate peroxymonosulfate (PMS) under visible-light-driven is highly feasible but remains a great challenge. In this work, the Co3O4/CeO2 composite was prepared by a facile chemical reaction, followed by annealing in a muffle furnace and then applied to activate PMS for ciprofloxacin (CIP) degradation. Various characterizations confirmed the formation of p-n heterojunction between Co3O4 and CeO2. Meanwhile, the 5 wt% Co3O4/CeO2/PMS composite showed highest degradation rate of CIP (87.8%) under visible light irradiation. The obtained Co3O4/CeO2/PMS system still exhibited a good catalytic performance in presence of different anion. Besides, the active radical h+, OH, O2−, and SO4− are involved in CIP degradation. The excellent degradation performance can be interpreted as the synergistic effect between Co3O4/CeO2 heterojunction photocatalyst and PMS activation. Moreover, the energy band structure and valence band deviation of Co3O4/CeO2 p-n heterogeneous junction were confirmed. This work would give a reference for combining the photocatalyst and activation of PMS under visible light for further removal of pollutants.

Subfields: Renewable Energy, Sustainability and the Environment, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/cf762a2c80b1d52f9c77a9d0795fc5a870c28c63