Rare Earth, heteropoly acid, gold / TiO2 composite catalytic and photocatalytic properties
This article describes the photocatalytic chemistry of semiconductor development status, theory and practical significance.TiO2 photocatalytic detailed mechanism of elimination of organic pollutants and present status.
Prepared (C5H7N2) 3AsMo12O40? 5H2O/TiO2 and RE (RE = La, Ce, Pr, Nd) / TiO2 photocatalysts.Designed and installed in the flow in a continuous photocatalytic reactor with methanol (acetone) and air mixed gas simulation of indoor air pollutants, the average wavelength in the visible or ultraviolet light irradiation 253.7nm under the photocatalytic elimination reaction,The effects of photocatalytic activity.The use of infrared spectroscopy, differential thermal - DTA, X-ray diffraction, scanning electron microscopy, fluorescence spectroscopy characterization of the catalyst system of means of spectroscopic properties and structural morphology.
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Sol - gel method RE (RE = La, Ce, Pr, Nd) / TiO2 photocatalysts of a single rare earth doping on the photocatalytic activity of TiO2.Elimination of methanol by photocatalytic experimental study of the activation temperature, doping different rare earth and its effect on the catalytic activity.DTA - DTA and fluorescence results show that: Due to the doping of rare earth elements, TiO2 from anatase to rutile phase transition temperature increased; photo-electron and hole recombination rates have decreased significantly improved catalytic performance.Pr doping element, especially catalytic properties of TiO2 to improve the most obvious.Initial concentration of 12.0g? M-3, a flow rate of 10.0ml? Min-1, when the amount of catalyst was 0.1g, Pr/TiO2 catalytic elimination of methanol elimination rate 84.0%.Catalytic elimination of Pr/TiO2 the kinetics of methanol reaction.Activation energy is 20.0kJ? Mol-1, showed a reaction.
Prepared by impregnation (C5H7N2) 3AsMo12O40? 5H2O/TiO2 composite photocatalyst, characterized by means of a series of catalysts were studied.It can be seen by scanning electron microscopy refined composite particles, particle distribution more uniform; measured TiO2 and different (C5H7N2) 3AsMo12O40? 5H2O catalyst content of the composite fluorescence emission spectra and found that the emission spectra of doped catalysts relative intensity is significantlyless than pure TiO2, note (C5H7N2) 3AsMo12O40? 5H2O doping helps to inhibit the electron - hole complex, fully reflects the synergy between the two.(C5H7N2) 3AsMo12O40? 5H2O doping content of 5.0wt.% Of (C5H7N2) 3AsMo12O40? 5H2O/TiO2 the catalytic activity of the best.The initial concentration of methanol 3.2g? M-3, initial concentration of acetone, 3.5 g? M-3, the system flow rate of 10.0ml? Min-1, the catalyst for the elimination of methanol and acetone rate of 100.0%.
UV-catalyzed elimination of methanol in the Au/TiO2 on the basis of a study to eliminate the visible effects of the methanol catalyst.Doping using orthogonal design, baking temperature and baking time on the catalyst preparation factors visible light photocatalytic activity, access to a gold content of 1.0wt.%, Calcination temperature is 200 ℃, the optimum preparation conditions.In visible light, when the initial concentration of methanol gas 35.0g? Min-1 flow rate was 5.0ml? Min-1, the catalytic elimination of up to 62.3%.
