期刊
CHEMOSPHERE
卷 287, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.132391
关键词
BiOCl; Metal doping; Bi2S3; Antibiotics; Photocatalytical degradation
资金
- National Natural Science Foundation of China [21964006]
- Hunan Provincial Natural Science Foundation of China [2020JJ4640]
- Scientific Research Fund of Hunan Provincial Education Department [20A050]
- Scientific Research Found of Changsha University [SF1934]
A novel BiOCl/Cu-doped Bi2S3 photocatalyst was designed to efficiently remove ciprofloxacin with high degradation rates under visible light irradiation. Superoxide radicals and photogenerated holes played crucial roles in the degradation process.
In this work, a novel BiOCl/Cu-doped Bi2S3 photocatalyst was designed to efficiently remove ciprofloxacin (CIP) with high photocatalytical activity and good stability over a wide pH range. Compared with Cu-doped Bi2S3, Bi2S3, BiOCl, BiOCl/Bi2S3, and Cu-doped BiOCl, the photocatalytical degradation rate of CIP (97.1% at 20 mg/L) over BiOCl/Cu-doped Bi2S3 was enhanced by about 84.77, 44.23, 2.95, 2.27, and 1.96 times within 20 min, respectively. Notably, the BiOCl/Cu-doped Bi2S3 photocatalyst also displayed high photocatalytical performance in the degradation of other antibiotics including norfloxacin, ofloxacin, and tetracycline (40 mL, 20 mg/L; 88.3%, 100%, and 95.2% of degradation rate within 30 min, respectively) under visible light irradiation. Radical trapping experiments and electron spin resonance technique indicated that superoxide radicals (center dot O-2(-)) and photogenerated holes (h(+)) played crucial roles in the photocatalytic degradation of CIP. Finally, the possible CIP degradation pathways was proposed by detecting the CIP intermediates in photocatalytical reaction process.
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