期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 531, 期 -, 页码 311-319出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.07.072
关键词
BiO2-x/Bi nanocomposites; Multiple valence states; Aqueous synthesis; Bisphenol A; Photodegradation mechanism
资金
- National Natural Science Foundation of China [21571057, 21701042]
- Fundamental Research Funds for the Central Universities
A series of BiO2-x/Bi nanocomposites were prepared via a time-dependent aqueous method, with the induction of lactic acid. The interaction of Bi3+ and C3H6O3 in stock solution determined the formation of nonstoichiometric BiO2-x as the precursor, subsequent reduction reaction at acid circumstance (pH = 3) produced combined composition of BiO2-x nanosheets and Bi particles. Multiple valence states of Bi element (Bi-0, Bi3+ and Bi5+) in the composite sample make it possible to manipulate the band structures of photocatalysts. The BiO2-x/Bi composites with appropriate composition exhibited superior photocatalytic performance in the degradation of colorless bisphenol A (BPA) under visible-light irradiation. The center dot O-2(-) and center dot OH radicals were detected as valid active species in the degradation process from ESR analysis. The photocatalytic mechanism over BiO2-x/Bi composites was proposed on the consideration of electron-hole separation and the interfacial charge transfer. (C) 2018 Elsevier Inc. All rights reserved.
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