期刊
APPLIED SURFACE SCIENCE
卷 466, 期 -, 页码 666-672出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2018.10.059
关键词
Photocatalysis-oxidation; Photocatalysis-reduction; Cr (VI) removal; Polypyrrole; Phenol removal
类别
资金
- National Natural Science Foundation of China [51672081]
- support program for hundred excellent talents of innovation in Hebei provincial universities (III) [SLRC2017049]
- Natural Science Foundation of Hebei Province, China [B2018209356]
We propose a non-metallic g-C3N4 nanosheet with efficient photo-oxidation and reduction ability that is modified by two non-metallic materials graphene and polypyrrole. The composite was tested by water treatment, including hexavalent chromium and phenol. It offers a visible response, easy recovery, and high stability, with a higher photo-degradation rate than bulk g-C3N4. The photoelectric performance test showed that the composite has a reduced Eg (2.58 eV) that is 0.12 eV lower than g-C(3)N4 (2.70 eV). The rGH can transfer electrons, and ppy can transfer holes, which helps improve the separation rate of photogenerated charge of the g-C3N4. When ppy and rGH operate concurrently, the separation of the photogenerated charge is greatly improved. In addition, the results of Vb-XPS show that the value of the valence band top of the hybrid hydrogel is more negative than bulk g-C3N4. Therefore, the pi-pi conjugation of ppy and rGH can effectively improve the utilization rate of visible light, the photogenerated transfer rate, the photocatalysis-oxidation ability, and the change in valence band position of g-C3N4.
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