| TiO2as one of the most popular photocatalytic materials, exist in the application of electron-hole high recombination rate and light absorption of narrow the scope of the problem. TiO2can be mixed with some oxide, reduce the recombination rate of electronic-hole pair, such as SnO2, is one of the ways to improve the photocatalytic efficiency. In this paper, through different characterization methods (such as XRD, TEM, BET) examines the different preparation methods, the SnO2hydrolysis under different pH and TiO2and SnO2different molar ratio on the composite catalyst morphology, and through the degradation of toluene as the probe reaction, comparing figures of the degradation of toluene and the quantitative relationship between the products toluene degradation mechanism is derived. The result is shown below:(1) Hydrothermal method at150℃,0.3g P25in pH,10mol·dm-3, under the conditions of preparation of nanotube wall is clear, the400℃roasting, nanotubes is still there.(2) The hydrothermal preparation of TiO2/SnO2composite catalyst, discovery system pH is12, mole ratio (nTiO2/nsnO2) for9:1, Sn4+lattice with between TiO4+replace, from TEM lattice fringes can be observed.(3) TiO2/SnO2composite catalyst degradation of toluene by CO2selectivity to evaluate its performance, it was found that the hydrothermal method with P25as titanium source, water solution pH value is equal to12, the preparation of TiO2/SnO2composite catalyst photocatalytic performance is the best, the toluene degradation rate of60.32%, the selectivity of CO2is71.62%, the quantity of the degradation of toluene per gram is1.92times of P25.(4) According to the degradation of toluene and product data, found that the degradation mechanism of toluene can be shown in the figure below:... |
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