Formaldehyde is a major cause of sick building syndrome. It is a colorless, irritating gas that is released from plywood adhesives used in furniture, ceiling materials, curtains, carpets, and construction materials. Formaldehyde is widely known as a deadly substance to the human body. Short-term exp...
Formaldehyde is a major cause of sick building syndrome. It is a colorless, irritating gas that is released from plywood adhesives used in furniture, ceiling materials, curtains, carpets, and construction materials. Formaldehyde is widely known as a deadly substance to the human body. Short-term exposure at 30 ppm or more can threaten life, and long-term exposure even at low concentrations can lead to allergic rashes, respiratory diseases, etc., or cancer.
In this study, Pt/AC, Pt/Al2O3, Pt/MgAl2O4, and Pt/TiO2 catalysts were prepared by supporting 1wt% of Pt on various supports in order to rapidly remove high concentration of formaldehyde at low temperature.
Among the four catalysts, the catalyst that removed all formaldehyde was Pt/AC, but this was mostly the result of adsorption, and the catalyst with the highest oxidation reaction was Pt/TiO2. This seems to be a result of the interaction between Pt and TiO2, and H2-TPR analysis showed that Pt was reduced at a lower temperature on the TiO2 support, and the XPR pattern before and after catalytic reduction showed that the conversion rate from Pt oxide to Pt metal was high.
In addition, 1wt% of Pt was supported on different types of TiO2-1, -2, and -3 in order to investigate the formaldehyde removal according to the TiO2 surface characteristics. As a result of the experiment, the highest oxidation reaction occurred in Pt/TiO2-2. As a result of calculating Pt crystallite size using Scherrer equation based on the XRD results, Pt crystallite size was the largest in Pt/TiO2-1 with the smallest specific surface area, and smaller value in Pt/TiO2-2 with larger specific surface area. Appeared, and in Pt/TiO2-3, the XRD peak was too small to be calculated. Through H2-TPR analysis, Pt/TiO2-2 and Pt/TiO2-3 were reduced at 80oC, but in the case of Pt/TiO2-1, it was confirmed that the reduction temperature was higher. XPS results in Pt/TiO2-2 after reduction in Pt Oxide. It was confirmed that it was shifted to Pt metal.
Finally, in order to find out about the formaldehyde removal using UV, an experiment was conducted depending on whether Pt/TiO2-2 and TiO2-2 were irradiated with UV. As a result, the removal rate and oxidation rate increased when Pt/TiO2-2 was irradiated with UV, and the increased oxidation rate was greater than the oxidation rate when UV was irradiated on TiO2-2. Through UV-Vis DR spectra, it was confirmed that the optical function at 385 nm wavelength was improved when Pt was supported on TiO2-2. When Pt is applied to TiO2, Pt attracts electrons excited from the TiO₂ surface to help charge separation, thereby separating electrons from holes in the valence band, delaying recombination of TiO₂ holes and electrons, thereby improving the photoactivity of TiO2. Seems to have been derived.
In conclusion, the Pt/TiO2-2 catalyst showed high performance in oxidizing formaldehyde due to the simultaneous action of adsorption, oxidation by Pt, and photooxidation by TiO2 when UV irradiation.
Formaldehyde is a major cause of sick building syndrome. It is a colorless, irritating gas that is released from plywood adhesives used in furniture, ceiling materials, curtains, carpets, and construction materials. Formaldehyde is widely known as a deadly substance to the human body. Short-term exposure at 30 ppm or more can threaten life, and long-term exposure even at low concentrations can lead to allergic rashes, respiratory diseases, etc., or cancer.
In this study, Pt/AC, Pt/Al2O3, Pt/MgAl2O4, and Pt/TiO2 catalysts were prepared by supporting 1wt% of Pt on various supports in order to rapidly remove high concentration of formaldehyde at low temperature.
Among the four catalysts, the catalyst that removed all formaldehyde was Pt/AC, but this was mostly the result of adsorption, and the catalyst with the highest oxidation reaction was Pt/TiO2. This seems to be a result of the interaction between Pt and TiO2, and H2-TPR analysis showed that Pt was reduced at a lower temperature on the TiO2 support, and the XPR pattern before and after catalytic reduction showed that the conversion rate from Pt oxide to Pt metal was high.
In addition, 1wt% of Pt was supported on different types of TiO2-1, -2, and -3 in order to investigate the formaldehyde removal according to the TiO2 surface characteristics. As a result of the experiment, the highest oxidation reaction occurred in Pt/TiO2-2. As a result of calculating Pt crystallite size using Scherrer equation based on the XRD results, Pt crystallite size was the largest in Pt/TiO2-1 with the smallest specific surface area, and smaller value in Pt/TiO2-2 with larger specific surface area. Appeared, and in Pt/TiO2-3, the XRD peak was too small to be calculated. Through H2-TPR analysis, Pt/TiO2-2 and Pt/TiO2-3 were reduced at 80oC, but in the case of Pt/TiO2-1, it was confirmed that the reduction temperature was higher. XPS results in Pt/TiO2-2 after reduction in Pt Oxide. It was confirmed that it was shifted to Pt metal.
Finally, in order to find out about the formaldehyde removal using UV, an experiment was conducted depending on whether Pt/TiO2-2 and TiO2-2 were irradiated with UV. As a result, the removal rate and oxidation rate increased when Pt/TiO2-2 was irradiated with UV, and the increased oxidation rate was greater than the oxidation rate when UV was irradiated on TiO2-2. Through UV-Vis DR spectra, it was confirmed that the optical function at 385 nm wavelength was improved when Pt was supported on TiO2-2. When Pt is applied to TiO2, Pt attracts electrons excited from the TiO₂ surface to help charge separation, thereby separating electrons from holes in the valence band, delaying recombination of TiO₂ holes and electrons, thereby improving the photoactivity of TiO2. Seems to have been derived.
In conclusion, the Pt/TiO2-2 catalyst showed high performance in oxidizing formaldehyde due to the simultaneous action of adsorption, oxidation by Pt, and photooxidation by TiO2 when UV irradiation.
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