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河北祥鹄科学仪器有限公司

100A Photocatalytic Activity of Microwave Ultrasound Enhanced Silver Doped TiO 2 Catalyst

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[Abstract]:
NoteThisresearchbytheresearcheroftheCollegeofChemistryandChemicalEngineeringofYunnanNormalUniversity,discussestheresearchonthephotocatalyticactivityofmicrowave-enhancedsilver-dopedTio2catalyst,publish
Note

This research by the researcher of the College of Chemistry and Chemical Engineering of Yunnan Normal University, discusses the research on the photocatalytic activity of microwave-enhanced silver-doped Tio2 catalyst, published in the important journal

Abstract

Silver doped TiO2 photocatalyst TiO2-Ag was prepared by sol-gel-wave dry method in [Bmim]PF6 ionic liquid medium. Using methyl orange as an organic pollutant, microwave ultrasonic combiner in microwave (MW), ultraviolet (UV), ultraviolet-microwave (UV-MW) and ultrasonic-ultraviolet-microwave (UT-UV-MW) conditions The degradation of methyl orange solution was carried out, and the effect of silver doping on the degradation of methyl orange by catalyst was investigated to improve the photocatalytic performance of the catalyst. X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), energy spectrum analysis (EDS), thermogravimetry-differential scanning calorimetry (TG-DSC-DTG), solid UV-visible analysis (Uv-vis) And infrared analysis (IR) for the characterization of TiO2-Ag catalyst. The results showed that the degradation rate of methyl orange was 88.05%, 93.98% and 99 after degradation of methyl orange for 35 min under UV, UV-MW and UT-UV-MW conditions under optimized conditions. .84%; after degradation of methyl orange for 55 min, the degradation rates of methyl orange were 98.79%, 99.05% and 99.90%, respectively. After degradation for 25 min under UT-UV-MW conditions, the degradation rate is close to 100%. It is shown that the TiO2-Ag catalyst has a high photocatalytic degradation activity, and the microwave ultrasonic synergy accelerates the photocatalytic degradation reaction. The structural analysis of the catalyst shows that the silver doping inhibits the transformation of the titanium dioxide crystal phase, increases the phase transition temperature, and enhances the stability. At the same time, the catalyst broadens the photoresponse range to the visible region, improves the quantum efficiency, and thus the photocatalytic performance. Can be improved.

Details

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Conclusion

1) The TiO2-Ag catalyst prepared by optimizing the reaction conditions has high photocatalytic activity. After 55 min under UV, UV-MW and UT-UV-MW conditions, the degradation rate of methyl orange is 98.79%. 99.05% and 99.84%, indicating that ultrasonic vibration and microwave irradiation can enhance the photocatalytic degradation of methyl orange by TiO2-Ag catalyst. 2) XRD, SEM and EDS characterization of the catalyst show that TiO2 is prepared under optimal conditions. -Ag is a single crystal anatase titanium dioxide with small crystal grains, large specific surface area and high crystallinity. The doping of silver does not affect the crystal form of titanium dioxide, and a small part enters the bulk phase of TiO2, and most of it is deposited on the surface of TiO2, indicating that it is feasible to incorporate silver in the preparation process. The results of TG-DSC-TAG analysis show that silver doping inhibits the transformation of the titanium dioxide crystal phase, which increases the phase transition temperature and enhances the stability. 3) UV-Vis and IR spectra show that the silver-doped TiO2-Ag catalyst broadens the photoresponse range to the visible region and improves the quantum efficiency. At the same time, the surface of the silver-doped TiO2-Ag catalyst has more favorable catalyst light. The hydroxyl group with increased catalytic activity will improve the photocatalytic performance of the catalyst.

Instrument

A certain amount of N-methylimidazole and bromo-n-butane were placed in a microwave catalytic synthesis/extraction apparatus, and a solution A was obtained after a reaction of microwave power of 500 W for 2 hours; a certain amount of potassium hexafluorophosphate solution was added to the solution A uniformly. Stir for a certain period of time to obtain 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim]PF6) ionic liquid; then, add a certain amount of absolute ethanol, ionic liquid and titanyl titanate in a 250 mL beaker. Ester to obtain solution B. Then take a certain amount of silver nitrate solution and slowly add dropwise to solution B and stir for 1 hour, vacuum filtration, and wash to obtain silver-doped TiO2 sol C. After the sol C is placed in a microwave oven for a certain period of time, it is then placed in a muffle furnace and calcined at 650 ° C for 3 hours to prepare different TiO2-Ag photocatalysts, which are placed in a desiccator for use.

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