期刊
JOURNAL OF CATALYSIS
卷 369, 期 -, 页码 469-481出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2018.11.029
关键词
Photocatalysis; Z-scheme system; Photocatalytic activity; BiOBr/CDs/g-C3N4; Photocatalytic mechanism
资金
- Program for the National Natural Science Foundation of China [51879101, 51579098, 51779090, 51709101, 51521006, 51809090, 51278176, 51378190]
- National Program for Support of Top Notch Young Professionals of China
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]
- Hunan Provincial Science and Technology Plan Project [2018SK20410, 2017SK2243, 2016RS3026]
- Fundamental Research Funds for the Central Universities [531109200027, 531107051080, 531107050978]
- Open fund of Hunan Province Key Laboratory of Coal Resources Clean-utilization and Mine Environment Protection [E21805]
Rapid recombination of photogenerated carriers and narrow visible light absorption range are two main defects in graphitic carbon nitride (g-C3N4)-based photocatalysts. To address these problems, construction of Z-scheme 2D/2D BiOBr/CDs/g-C3N4 heterojunction photocatalysts with carbon dots as solid-state electron mediators has been investigated. The resultant BiOBr/CDs/g-C3N4 hybrids exhibits remarkable interfacial charge transfer abilities and a broadened solar light absorption range owing to the short charge transport distance and the up-converted photoluminescence character of CDs. Simultaneously, the enhanced specific surface area and nanosheet structure impart more active sites to BiOBr/CDs/g-C3N4 composites. As a result, BiOBr/CDs/g-C3N4 composites reveal significant enhancement in the activity of photodegradation of ciprofloxacin (CIP) and tetracycline (TC) under visible and near infrared (NIR) light irradiation. Moreover, the photodegradation efficiency of BiOBr/CDs/g-C3N4 hybrids was significantly enhanced over that of pristine BiOBr nanosheets and g-C3N4 ultrathin nanosheets. The photocatalytic mechanism is expounded according to free radical capture experiments and electron spin resonance spin-trapping tests and the photodegradation intermediates of CIP were detected by liquid chromatography-mass/mass spectrometry. Moreover, BiOBr/CDs/g-C3N4 composites show excellent photostability and reusability after four runs for CIP degradation. (C) 2018 Elsevier Inc. All rights reserved.
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