研究目的
Investigating the influence of TiO2 structure on its photocatalytic activity towards acetaldehyde decomposition under UV light irradiation.
研究成果
TiO2 with mixed phases of anatase and brookite, prepared at neutral pH and calcined at 450 °C, showed the highest photocatalytic activity towards acetaldehyde decomposition under UV light. The presence of brookite enhanced the density of electron traps and improved charge separation, leading to higher photocatalytic activity. Nitrogen doping increased electron traps density but did not enhance photocatalytic activity. The optimal calcination temperature was found to be 450 °C, facilitating total crystallization and interparticle contact.
研究不足
The study focuses on the photocatalytic decomposition of acetaldehyde under UV light, and the results may not be directly applicable to other pollutants or under different light conditions. The influence of humidity and other environmental factors on photocatalytic activity was not extensively studied.
1：Experimental Design and Method Selection:
Sol-gel method was used for preparation of TiO2 with different structure and phase composition. The photocatalytic activity was tested towards acetaldehyde decomposition under UV light irradiation.
2：Sample Selection and Data Sources:
TiO2 samples were prepared at different pH levels (3, 5, and 10) and calcined at various temperatures (200–500 °C).
3：List of Experimental Equipment and Materials:
X-ray diffractometer (Philips X’Pert PRO), BET surface area measurements (QUADRASORB analyzer), UV–Vis/DR spectrophotometer (Jasco V-650), FTIR spectrophotometer (Jasco FTIR 4200), XPS measurements (PREVAC UHV system), FE-SEM (Hitachi SU8020), HR-TEM (FEI Tecnai F30), CN628 elemental analyzer (LECO Corporation).
4：Experimental Procedures and Operational Workflow:
TiO2 nanoparticles were prepared by sol-gel method, characterized by various techniques, and tested for photocatalytic decomposition of acetaldehyde in a closed reactor under UV light irradiation.
5：Data Analysis Methods:
XRD patterns were analyzed for phase composition, BET for surface area, UV–Vis/DR for band gap energy, FTIR for surface hydroxyl groups, XPS for surface nitrogen content, and photocatalytic activity was measured by gas chromatography.
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