Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 303, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2022.122219
Keywords
MoS2; Ciprofloxacin; Peroxymonosulfate; Z-heterojunction
Categories
Funding
- Natural Science Foundation of Xinjiang Uygur Autonomous Region [2021D01C461, 2022D01C333]
- Scientific Research Project of Yili Normal University [2017YSYY08]
- Open Project of Key Laboratory of Pollutant Chemistry and Environmental Treatment of Yili Normal University [2020HJYB001]
- Science and Technology Project of Yili Kazak Autonomous Prefecture in 2022 [YZ2022Y003]
- National Natural Science Foundation of China [51978319]
- Outstanding Youth Foundation of Gansu Province [20JR10RA651]
- Research and Innovation Team Cultivation Program of Yili Normal University [CXZK2021004]
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In this study, a series of Z-type heterojunctions FexCN@MoS2-Y were synthesized for the removal of ciprofloxacin (CIP) by peroxymonosulfate (PMS) activation under visible light. Fe3CN@MoS2-4 exhibited excellent photocatalytic performance and could efficiently degrade other antibiotics. Reactive substances such as 1O2, h+, and Ovs played a dominant role in this system. Mechanisms and degradation pathways were explored to understand the enhanced CIP degradation efficiency.
Herein, a series of Z-type heterojunctions FexCN@MoS2-Y were synthesized by a combination of calcination and hydrothermal methods for the removal of ciprofloxacin (CIP) by peroxymonosulfate (PMS) activation under visible light. It was optimized that Fe3CN@MoS2-4 exhibited excellent photocatalytic performance, with the degradation rate of CIP 84 % within 140 min. Besides, its rate constants were 23.74, 3.59, and 3.98 times higher than those of pure g-C3N4, Fe3CN, and MoS2, respectively. Furthermore, the Fe3CN@MoS2-4/PMS/vis system could efficiently degrade other antibiotics (enrofloxacin (ENRO), metronidazole (MNZ) and tetracycline (TC)). The quenching experiments and electron paramagnetic resonance (EPR) characterization showed that reactive substances such as 1O2, h+ and Ovs played a dominant role in this system. We deeply explore the possible mechanisms and CIP degradation pathways for the enhanced CIP degradation efficiency in the Fe3CN@MoS2-4/ PMS/vis system. Among them, the exposed Mo (IV) and Fe (II) sites on the catalyst surface accelerated the electron transfer, while the S2-therein promoted the cycling between ions, thus increasing the reaction rate. Finally, Fe3CN@MoS2-4 maintained appreciable performance even after 5 cycles. This study may provide a new approach for the development of metal-doped g-C3N4-based complexes.
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