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.
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