| Recent years, semiconductor photocatalysis has been a hot spot of multidisciplinary cross field. This dissertations focus on the design and fabrication of Bi PO4-based photocatalyst materials and investigation of its photoctalytic activity enhancement mechanism. Rod-like bismuth phosphate was synthesized via a facile hydrothermal process, and characterized by a series of techniques to investigate the energy band structure, phase composition and photo-absorptive properties of as-synthesized samples. Furthermore, the relationship between the structure and properties of the catalysts was also investigated. At the same time, element doping and narrow-semiconductor modification was employed to modulate the energy band and light responsive range of Bi PO4-based photocatalyst. In addition, a series of probe molecule were employed to evaluate it potential performance for dye waste-water(MB and Rh B), phenolic pollutants waste-water(phenol, p-nitrophenol). Additionally, the desulfurization activity of as-fabricated photocatalyst for the simulation fuel oil was also investigated. The main content andconclusion are listed as follows:(1) Using different phosphate as raw materials, a series of Bi PO4 photocatalyst was prepared by the hydrothermal method, and cationic dye methylene blue(MB) was selected as probe molecule to investigate it performance for dye waste-water treatment. And n-octane solution was used as simulation FCC gasoline, dibenzothiophenes for sulfur-containing compound to explore its photocatalytic oxidation desulfurizaiton(Photo-Cat-ODS) activity. The experimental results provide new ideas for the further exploration of the practical application of Bi PO4.(2) With Sm(NO3)3, NH4H2PO4 and Bi(NO3)3 as starting material, Sm3+ doped Bi PO4 photocatalysts were synthesized by hydrothermal method, and XRD, UV-Vis-DRS, SEM, specific surface area and pore size analyzer(BET) techniques was employed to characterize phase composition, particle size, surface morphology and specific surface area of as-synthesized samples. The catalytic activities of samples were evaluated by decomposition of simulated dye waste-water.(3)With melamine as raw material, g-C3N4/Bi PO4 heterogeneous photocatalysts with high stability has been synthesized by an impregnation method. The morphology, composition and optical absorption properties of g-C3N4/Bi PO4 hetero-photocatalysts was investigated. Rhodamine B and phenol was employed to evaluate its photocatalytic performance for dye and phenolic waste-water. Furthermore, based on the determination of free radical species, the photocatalytic activity enhancement mechanism of g-C3N4/Bi PO4 hetero-photocatalysts was also discussed.(4)Ag Br/Bi PO4 heterophotocatalyst has been successfully fabricated by using the simple deposition precipitation method. Methyl-blue(MB), phenols(phenol) was selected as the model pollutants to evaluate the activity of the as-synthesized sample. The experimental result indicated that Ag Br nanoparticles can significant enhance the photocatalytic activity of Bi PO4. Furthermore, the photocatalytic activity enhancement mechanism of Ag Br/Bi PO4 hetero-photocatalyst has been also discussed according to relative position of valence band and the conduction band of two components(Ag Br and Bi PO4). |
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