磷掺杂的介孔石墨相氮化碳光催化降解染料

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Abstract Phosphorus doped mesoporous graphite carbon nitride was successfully prepared by simple thermal copolymerization with melamine, melamine polyphosphate and SBA-15. Afterwards, its morphology and optical properties was characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy (EDS) and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis-DRS). The results showed that phosphorus element was successfully doped on the structure of carbon nitride, and distributed homogeneously on the structure of whole nanoporous material. Compared to g-C₃N₄, the specific surface area of P-mpg-C₃N₄ can reach 198.3m²/g. In this way, more active site was obtained for photocatalytic reaction. The photocatalytic degradation of brilliant ponceau 5R (BP-5R) in solution was studied under visible light irradiation. It was also found that the photocatalytic degradation rate of P-mpg-C₃N₄ is 31.3times that of g-C₃N₄. The relative mechanism was as following. On the one hand, the P-doping and fragmented mesoporous structure could effectively extend visible light absorption range from 440nm to 460nm. On the other hand, the separation of photo-generated electron-hole pairs had been promoted and the transfer of photo-generated electrons had been accelerated. In this way, more active species participation in photocatalytic reaction process. Besides, photocatalytic performance remained 91.67% of the original state after 5cycles, the results of these cyclic experiments reveal that synthesized photocatalyst had good photocatalytic stability.

Key words： phosphorus doping mesoporous graphite carbon nitride photocatalytic degradation

Received: 27 January 2019

PACS:

X703

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	Articles by authors
	PENG Xiao-ming
	LUO Wen-dong
	HU Yu-ying
	DAI Hong-ling
	HU Feng-ping
	LIAO Xiang-yue
	WANG Qi

Cite this article:

PENG Xiao-ming,LUO Wen-dong,HU Yu-ying等. Study on the photocatalytic degradation of dyes by phosphorus doped mesoporous graphite carbon nitride[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3277-3285.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I8/3277

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