Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 560, Issue -, Pages 701-713Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.10.116
Keywords
Photocatalysis; 2D/2D heterostructure; Charge transfer; Degradation pathways; Mechanism
Categories
Funding
- Program for the National Natural Science Foundation of China [51779090, 51408206, 41601272, 51879101, 51579098, 51521006, 51809090, 51278176, 51378190]
- Science and Technology Plan Project of Hunan Province [2017SK2243, 2018SK20410, 2016RS3026]
- National Program for Support of Top-Notch Young Professionals of China, China (2014)
- Program for New Century Excellent Talents in University [NCET-13-0186]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]
- Fundamental Research Funds for the Central Universities [531107050978, 531107051080, 531109200027]
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Photocatalysis technology is regarded as a promising way for environmental remediation, but rationally designing photocatalysis system with high-speed interfacial charge transfer, sufficient photoabsorption and surface reactive sites is still a challenge. In this study, anchoring single-unit-cell defective Bi2MoO6 on ultrathin g-C3N4 to form 2D/2D heterostructure system is a triple-purpose strategy for high-performance photocatalysis. The defect structure broadens photo-responsive range. The large intimate contact interface area between two monomers promotes charges carrier transfer. The enhanced specific surface area exposes more reactive sites for mass transfer and catalytic reaction. As a result, the obtained heterostructure displays excellent photocatalytic performance for ciprofloxacin (CIP) (0.0126 min(-1)), which is 3.32 and 2.93 folds higher than Bi2MoO6 and g-C3N4. In addition, this heterostructure retains high-performance for actual wastewaters treatment, and it displays strong mineralization ability. And this heterojunction also exhibits excellent photostability based on cyclic experiment. Mechanism exploration reveals that hole, superoxide radical, and hydroxyl radical are chief reactive species toward CIP degradation, thereby a Z-scheme charge carrier transfer channel is proposed. In addition, the intermediates and degradation pathways of CIP are tracked by liquid chromatography-triple quadrupole tandem mass spectrometry (LCMS/MS) and three-dimensional excitation-emission matrix fluorescence spectroscopy (3D EEMs). This study paves new way to design and construct atomic level 2D/2D heterojunction system for environment remediation. (C) 2019 Elsevier Inc. All rights reserved.
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