Journal
CHINESE JOURNAL OF CATALYSIS
Volume 39, Issue 4, Pages 654-663Publisher
SCIENCE PRESS
DOI: 10.1016/S1872-2067(17)62927-9
Keywords
g-C3N4; BiOI; Nanosheet; Photodegradation; Double-transfer mechanism; Visible light
Funding
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JZ001]
- National Natural Science Foundation of China [21303130]
- State Key Laboratory of Heavy Oil Processing [SKLOP201602001]
- Fundamental Research Funds for the Central Universities [cxtd2017004]
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Constructing binary heterojunctions is an important strategy to improve the photocatalytic performance of graphitic carbon nitride (g-C3N4). In this paper, a novel g-C3N4 nanosheet-based composite was constructed via in situ growth of bismuth oxyiodide (BiOI) nanoplates on the surface of g-C(3)N4 nanosheets. The crystal phase, microstructure, optical absorption and textural properties of the synthesized photocatalysts were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy (DRS), and nitrogen adsorption-desorption isotherm measurements. The BiOI/g-C(3)N4 nanosheet composite showed high activity and recyclability for the photodegradation of the target pollutant rhodamine B (RhB). The conversion of RhB (20 mg L-1) by the photocatalyst was nearly 100% after 50 min under visible-light irradiation. The high photoactivity of the BiOl/g-C3N4 nanosheet composite can be attributed to the enhanced visible-light absorption of the g-C3N4 nanosheets sensitized by BiOI nanoplates as well as the high charge separation efficiency obtained by the establishment of an internal electric field between the n-type g-C3N4 and p-type BiOI. Based on the characterization and experimental results, a double-transfer mechanism of the photoinduced electrons in the BiOl/g-C3N4 nanosheet composite was proposed to explain its activity. This work represents a new strategy to understand and realize the design and synthesis of g-C3N4 nanosheet-based heterojunctions that display highly efficient charge separation and transfer. (C) 2018, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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