期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 612, 期 -, 页码 722-736出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.12.196
关键词
g-C3N4; S-scheme; Visible light; Photocatalysis; Heterojunction
资金
- National Natural Science Foundation of China [51808250]
- Jiangsu Key Research and Development (R&D) Projects (Social Development) [BE2020772]
- Natural Science Foundation of Jiangsu Province [BK20181070]
- Huaian Natural Science Research Program [HAB202157]
A novel g-C3N4/BiO1.2I0.6 heterojunction was constructed by calcining a mixture of g-C3N4 nanosheets and flower-like BiOI, exhibiting excellent photocatalytic performance for hydrogen production and BPA degradation with high cycle stability.
A novel 2D/3D S-scheme carbon nitride/iodine-deficient bismuth oxyiodide (g-C3N4/BiO1.2I0.6) heterojunction was constructed for the first time by calcining a mixture of g-C3N4 nanosheets and flower-like BiOI. Irradiated by visible light, this g-C3N4/BiO1.2I0.6 heterojunction exhibited excellent photocatalytic hydrogen production and BPA degradation activity with high cycle stability. In particular, the photocatalytic activity of 0.2-C3N4/BiO1.2I0.6 could reach 1402.7 lmol g-1 h-1 (hydrogen production rate) and 0.01155 min-1 (apparent rate of bisphenol A degradation), which were 3.5 and 3.2 times that of g-C3N4 respectively. The remarkable photocatalytic performance was due to the efficient charge separation of gC3N4/BiO1.2I0.6 and the formation of S-scheme heterojunction, which maintained strong photocatalytic reduction and oxidation potentials. Noticeably, the charge density difference and band offsets of the gC3N4/BiO1.2I0.6 were calculated. The results revealed that a built-in electric field (IEF) was created. The values of the valence band offset (DEVBO) and the conduction band offset (DECBO) were-0.84 and-1.27 eV, respectively, which further demonstrated the formation of S-scheme photocatalytic charge transfer mechanism. (c) 2022 Elsevier Inc. All rights reserved.
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