科研之友
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摘要
n this study, a novel spherical TiO2/g-C3N4 hybrid was obtained by facile solvothermal synthesis. The morphologies were characterized by field emission scanning electron microscope (FE-SEM) and transmission electron microscopy (TEM). The structural properties of TiO2/g-C3N4 were analyzed by X-ray diffraction (XRD) and the (002) peak shifted slightly in g-C3N4 revealed the effect of TiO2 on the interlayer distance of g-C3N4 due to the tight contact between TiO2 and g-C3N. The chemical compositions of TiO2/g-C3N4 were analyzed by Foutier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS), and the tiny characteristics were deeply analyzed for exploring carbonylation of tri-s-triazine units due to TiO2 as catalyzer. The thermal stability of TiO2/g-C3N4 hybrid was carried out by thermogravimetric differential scanning calorimetry (TG-DSC), and the degradation temperatures of g-C3N4 obviously decreased under TiO2. UVvis diffuse reflectance spectroscopy (DRS) was performed to investigate the absorption bandgap energy, while photoluminescence (PL) indicated the lower recombination of photo-generated charges for TiO2/g-C3N4 hybrids. The photocatalytic activity and stability of the TiO2/g-C3N4 hybrid was evaluated by degradation of Methyl Blue under visible light irradiation. The result indicated that the optimum mass ratio of TiO2/g-C3N4 of 12:1 was 7.3 times, 12.5 times and 87.5 times as high as that of Degussa P25, nanosheet TiO2 and powder g-C3N4, respectively, which exhibited an excellent photocatalytic performance. Recycling test of H 12-1 shows still quite a high catalytic performance after the continuous irradiation of 600 mins. At the end of article, a possible photocatalytic mechanism was discussed based on the experimental results.
- 出版日期2017-5
- 单位南京工业大学; 华北电力大学（保定）; 南京理工大学; 华北电力大学
