Construction of g-C 3 N 4 /CeO 2 /ZnO ternary photocatalysts with enhanced photocatalytic performance
| Autor: | Gui-Fang Huang, Bing-Xin Zhou, Yuan Yuan, Wei-Qing Huang, Wangyu Hu, Shengli Chang, Dan-Ni Xiong |
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| Rok vydání: | 2017 |
| Předmět: |
Photocurrent
Nanocomposite Materials science Heterojunction Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Chemical engineering Photocatalysis General Materials Science Charge carrier 0210 nano-technology Ternary operation Photodegradation Nanosheet |
| Zdroj: | Journal of Physics and Chemistry of Solids. 106:1-9 |
| ISSN: | 0022-3697 |
| Popis: | Promoting the spatial separation of photoexcited charge carriers is of paramount significance for photocatalysis. In this work, binary g-C 3 N 4 /CeO 2 nanosheets are first prepared by pyrolysis and subsequent exfoliation method, then decorated with ZnO nanoparticles to construct g-C 3 N 4 /CeO 2 /ZnO ternary nanocomposites with multi-heterointerfaces. Notably, the type-II staggered band alignments existing between any two of the constituents, as well as the efficient three-level transfer of electron-holes in unique g-C 3 N 4 /CeO 2 /ZnO ternary composites, leads to the robust separation of photoexcited charge carriers, as verified by its photocurrent increased by 8 times under visible light irradiation. The resulting g-C 3 N 4 /CeO 2 /ZnO ternary nanocomposites unveil appreciably increased photocatalytic activity, faster than that of pure g-C 3 N 4 , ZnO and g-C 3 N 4 /CeO 2 by a factor of 11, 4.6 and 3.7, respectively, and good stability toward methylene blue (MB) degradation. The remarkably enhanced photocatalytic activity of g-C 3 N 4 /CeO 2 /ZnO ternary heterostructures can be interpreted in terms of lots of active sites of nanosheet shapes and the efficient charge separation owing to the resulting type-II band alignment with more than one heterointerface and the efficient three-level electron-hole transfer. A plausible mechanism is also elucidated via active species trapping experiments with various scavengers, which indicating that the photogenerated holes and •OH radicals play a crucial role in photodegradation reaction under visible light irradiation. This work suggest that the rational design and construction of type II multi-heterostructures is powerful for developing highly efficient and reusable visible-light photocatalysts for environmental purification and energy conversion. |
| Databáze: | OpenAIRE |
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