鈦基二元復(fù)合氧化物的制備及其光催化性能研究
[Abstract]:Titanium dioxide photocatalysis technology can utilize solar energy to alleviate environment and energy problem, it is a promising semiconductor material, and has gained wide attention and application. The development of composite photocatalytic material has important scientific significance in promoting semiconductor photocatalysis technology in solar energy utilization. In this paper, TiO _ 2/ SiO _ 2, TiO _ 2/ Bi _ 2WO _ 6 and TiO _ 2/ Bi _ (3.64) Mo _ (0.036) O _ (6.55) photocatalysts were synthesized by template-solvent thermal method, solvent thermal method and in situ-solvent thermal method, and the effects of morphology and microstructure on photocatalytic performance were systematically studied. The photocatalytic activity of the catalyst was evaluated by photocatalytic degradation, and the possible mechanisms of photoionization were also discussed. First, the binary composite oxide TiO _ 2/ SiO _ 2 photocatalyst was synthesized by template-solvent thermal method. RhB (RhB) is used as the target pollutant, and the application of the prepared photocatalyst in ultraviolet and visible light degradation and organic pollutants is evaluated to improve the utilization rate of solar energy. Under the optimum conditions, TS2 (TS2 stands for the molar ratio of titanium to silicon: 1: 1), the apparent rate constant of visible light degradation is more than 33 times of pure TiO _ 2, which is 6 times more than that of commercial TiO _ 2 (P25); under the ultraviolet light is more than 5 times of pure TiO _ 2, which is more than 1 times of P25. The degradation rate of TS2 to methyl orange was only 11. 6% under the condition of 40 min of visible light illumination. The photocatalytic activity of TS2 was the best. After repeated use of TS2 for 5 times under visible light irradiation, the degradation rate was only reduced by 9%, indicating that the catalyst exhibited good stability. Therefore, the photocatalyst TS2 has high-efficiency selectivity to the photocatalytic degradation of the RhB B. The degradation rates of BQ or EDTA-2Na and TS2 to RhB were 19. 0% or 37. 8%, respectively. The results confirmed that the active species super-oxygen free radical (路 O _ 2-) and hole (h +) play an important role in the degradation of RhB. However, when tert-butanol (TBA) was added, the degradation rate of TS2 to RhB was 95.7%, indicating that hydroxyl radical (路 OH) was not the main active species. Secondly, TiO _ 2/ Bi _ 2WO _ 6 composites were synthesized by solvent thermal method. The practical application of the complex was widened by two different types of pollutants (RhB (RhB), tetracycline (TC) and Cioxacin (CIP) in the visible light reduction. A good fit is given to the solution (C0/ C) corresponding to the RhB solution of the visible light falling solution, which shows that the first-order kinetics is observed. The rate constant of TB2 (molar ratio of TiO _ 2 to Bi _ 2WO _ 6 was 1: 1) was 0. 1598min-1, higher than Bi _ 2WO _ 6 (0. 0996 min-1), TiO _ 2 (0.0165 min-1) and P25 (0.0255 min-1). The degradation rate of TB2 catalyst under visible light for 40min and TC was 63. 3%, while pure Bi _ 2WO _ 6 was only 33.9%, and pure TiO _ 2 was only 56. 9%. The prepared compound enhances photocatalytic degradation of RhB, TC and CIP catalytic activity under the irradiation of visible light, and is attributed to the low recombination rate of light generated by the heterogeneous interface between the semiconductors. The fluorescence intensity of TiO _ 2/ Bi _ 2WO _ 6 complexes is lower than that of pure Bi _ 2WO _ 6, which shows that the formation of TiO _ 2/ Bi _ 2WO _ 6 composites inhibits the recombination of electrons and holes. Photochemical photo-current and impedance testing also indicate rapid transfer of photogenic carriers. Electron spin resonance (ESR) shows that the super-oxygen free radical is the main active species, which is consistent with the free radical trapping experiment. Finally, TiO _ 2/ Bi _ (3.64) Mo _ (0.364) Mo _ (0.036) O _ (6.55) composite photocatalyst was prepared by in-situ-solvent thermal method with different TiO _ 2 loading. The photocatalytic activity of Bi _ (3.64) Mo _ (0.364) Mo _ (0.036) O _ (3.64) Mo _ (0.364) Mo _ (0.364) Mo _ (0.036) O _ (6.55) (recorded as TBMO _ 3) was significantly improved when TiO _ 2 was introduced. Photocatalytic degradation of RhoB B solution by photocatalyst is a first-order kinetic reaction. The rate constants of TBMO _ 3 were 0. 2068min-1, respectively, Bi _ (3.64) Mo _ (0.036) O _ (6.55), P25 and TiO _ 2 were 4. 5, 10 and 94 times, respectively. By taking full advantage of the high specific surface area (134,24m2 路 g-1) of TiO _ 2, the specific surface area and porosity of the composite material were investigated. The results show that TBMO _ 3 has a short average life of 4.61 ns and higher photocatalytic activity can be attributed to effective charge transfer and separation compared with Bi _ (3.64) Mo _ (0.036) O _ (6.55) (6.77 ns). The fluorescence spectrum test further proves that the separation and transport of photogenic carriers can be effectively achieved by the synergistic effect of TiO _ 2 and Bi _ (3.64) Mo _ (0.036) O _ (6.55), which may belong to the mechanism of Z-type photoionization. TiO _ 2/ Bi _ (3.64) Mo _ (0.036) O _ (6.55) composites have better stability, which indicates that the composites can provide effective strategies in the application of water purification and environment treatment.
【學(xué)位授予單位】:湖北師范大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:O643.36
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