釩酸鐵、鉬酸鐵和釩酸鎘摻雜石墨相氮化碳材料的光催化性能研究
[Abstract]:Since the 1970s, semiconductor photocatalysis technology has been favored by scientific researchers. In order to make full use of solar energy, scientists regard the research and development of visible light responsive photocatalyst materials as the most important problem in the development of photocatalytic materials. G-C3N4 is a new type of organic polymer semiconductor reported in recent years. It has the advantages of visible light, good chemical and thermal stability, nontoxic and simple preparation, and has attracted the attention of researchers all over the world, and has a broad application prospect. In this paper, based on g-C3N4, three kinds of high efficient visible light responsive photocatalysts were obtained by modifying g-C _ 3N _ 4 with the modification of ferrovanadate, ferromolybdate and cadmium vanadate. Firstly, a simple hydrothermal and grinding roasting method was used to prepare FeVO4/g-C3N4 composite photocatalyst which can respond to visible light. The mechanism of photocatalytic reaction was obtained by a series of characterization of the composite catalyst. From the results of many characterizations we can draw a conclusion that the fundamental reason for the increase of catalyst activity is the formation of heterojunctions between FeVO4/g-C3N4 and the inhibition of photogenerated electron-hole pairs. Moreover, the doping content of FeVO4/g-C3N4 is an important factor affecting the activity of the catalyst. When the actual content of FeVO4 is 5.0 wt%, the catalytic activity of the composite catalyst is the highest. Secondly, g-C3N4/Fe2 (MoO4) 3 composite phase catalyst was prepared by grinding and calcination method. The catalyst has a good response to visible light and can absorb visible light with a wavelength less than 560nm. 10.6wt%g-C3N4/Fe2 (MoO4) 3 has the best catalytic effect under visible light. The fundamental reason is that g-C3N4 and Fe2 (MoO4) 3 have matched band structure. The structure of heterojunction improves the efficiency of electron and hole separation, prolongs the lifetime of carriers, and improves the activity of catalyst. Finally, the CdV2O6/g-C3N4 composite photocatalyst was prepared by the same method, and the degradation performance of Rhodamine B under visible light irradiation was investigated. (BET), Fourier transform infrared spectroscopy (FT-IR), UV-vis DRS), thermogravimetric (TG), scanning electron microscope (SEM),) and X-ray powder diffraction (XRD), N2) physical adsorption on (BET), The catalytic properties, structure, morphology and photocatalytic activity of the catalyst were investigated by transmission electron microscopy (TEM), (TEM), chemical oxygen demand (COD) and other techniques. The results show that the catalyst has high catalytic activity and good stability and has a broad prospect.
【學(xué)位授予單位】:浙江師范大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:O643.36;O644.1
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