期刊
CHEMOSPHERE
卷 265, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.129013
关键词
Photocatalytic degradation; Reduced graphene oxide; Bi-based photocatalyst; Antibiotics
资金
- National Natural Science Foundation of China [21874157, 21701135, 21675175, 21275166]
- Major Projects of Technical Innovation of Hubei Province [2017ACA172]
- Natural Science Foundation of Hubei Province [2018CFB617, 2015CFA092]
The integration of reduced graphene oxide (rGO) with Bi4O5Br2 nanosheets enhances the adsorption and photocatalytic properties of the photocatalyst towards antibiotics under visible light irradiation. The nanocomposite containing 1.0 wt% rGO shows optimal adsorption and photocatalytic activity towards ciprofloxacin, norfloxacin, and tetracycline. Active species such as O•2-, OH•, and h+ were identified as main participants in the photodegradation system.
A photocatalyst based on the integration of reduced graphene oxide (rGO) with Bi4O5Br2 nanosheets was facilely prepared and was confirmed by transmission electron microscope, scanning electron microscope, X-ray diffraction and Raman spectroscopy. The integration of rGO can effectively improve the adsorption and the photocatalytic properties of Bi4O5Br2 nanosheets towards the target antibiotics under visible light irradiation. rGO/Bi4O5Br2 nanocomposite containing 1.0 wt% of rGO exhibits the optimal adsorption and photocatalytic activity towards ciprofloxacin (CIP), norfloxacin (NOR) and tetracycline (TC). The removal efficiencies of CIP, NOR and TC are 97.6%, 80.7% and 98.7%, which are higher than that obtained with Bi4O5Br2 nanosheets. The capture experiments and ESR data show that center dot O-2(-), OH center dot and h(+) are the main active species that participated in the photodegradation system. This work provides a simple strategy to integrate rGO with BixOyXz (X = Cl, Br, I) nanosheets to construct effective photocatalysts for the degradation of antibiotics. (C) 2020 Elsevier Ltd. All rights reserved.
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