期刊
MOLECULAR CATALYSIS
卷 435, 期 -, 页码 91-98出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mcat.2017.03.026
关键词
g-C3N4; Ag2CO3; Composite photocatalyst; Charges separation property; Z-scheme mechanism
资金
- Science and Technology Department of Sichuan province [2015JY0081]
- Project of Zigong city [2014HX14, 2014HX09]
- Key Laboratory of Green Catalysis of Sichuan Institutes of High Education [LZJ1302]
The photocatalytic performance of g-C3N4 is greatly limits by its inherent drawbacks, thus it is urgent to boost the photocatalytic activity of g-C3N4. Constructing Z-scheme composite photocatalysts has received great interesting in the photocatalysis field because of its great potential to promote the catalytic activity of photocatalysts by accelerating the separation of the photo-induced charge pairs. In this study, a series of Z-scheme Ag2CO3/g-C(3)N(4)composites were fabricated and characterized by X-ray diffraction patterns (XRD), inductively coupled plasma (ICP) spectroscopy, particle size analyzer, UV-vis diffuse reflectance spectra (DRS), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), high-resolution transmission electron microscopy (HRTEM), surface photovoltage spectroscopy (SPS),electron spin-resonance (ESR) spectroscopy and scavenger experiments. The corresponding photo catalytic performance toward methyl orange (MO) decolorization were investigated under the simulated sunlight irradiation. The results reveal that the Ag2CO3/g-C(3)N(4)composites display higher photocatalytic activity than the bare g-C3N4. The photocatalytic activity of the 7% molar ratio of Ag/g-C3N4 composite is more than 15 times of that of the bare g-C3N4. Based on the results of ESR and SPS, a Z-scheme separation and transfer scheme of the photo-induced charge pairs of Ag2CO3/g-C3N4 was proposed. This study sheds light on understanding the Z-scheme charge transfer mechanism. (c) 2017 Elsevier B.V. All rights reserved.
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