期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 809, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.151804
关键词
BiOI/g-C3N4/CeO2; Tetracycline; Visible light irradiation; Photocatalysis; Double charge transfer process
资金
- Natural Science Foundation of Guangdong Province, China [2018A030313734]
In this work, a novel visible-light-driven ternary BiOI/g-C3N4/CeO2 photocatalyst was successfully synthesized by calcination and hydrothermal treatment. The obtained ternary BiOI/g-C3N4/CeO2 had high photocatalytic performance for the degradation of tetracycline (TC) under visible-light irradiation. The samples were characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance (DRS) spectroscopy, and Fourier transform infrared spectroscopy (FT-IR), etc. The results indicated that 3 wt% BiOI/g-C3N4/CeO2 catalyst possessed the best photocatalytic activity (91.6%) among all the as-prepared samples. The enhanced photocatalytic activity could be attributed to a double charge transfer process between g-C3N4 and other catalysts in the ternary heterojunction, so that the separation of photogenerated electronehole pairs was more effective. The as-prepared ternary sample also exhibited high stability after six cycles of the photodegradation reaction. Additionally, the active species (h(+)) were considered as the main reactive species during the degradation of TC. Based on the research results, a possible photocatalytic reaction mechanism for the BiOI/g-C3N4/CeO2 sample was proposed and discussed in detail. (C) 2019 Elsevier B.V. All rights reserved.
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