研究目的
To enhance the photocatalytic activity of K-doped TiO2 films with nanosheet structure by controlling the amount of TiC in TiC-Ti coatings before low-temperature molten-salt treatment in KNO3.
研究成果
K-doped TiO2 photocatalyst films with nanosheet structure were successfully fabricated, showing enhanced photocatalytic activity that peaks at 40% TiC content. The nanosheet structure increases surface area and is linked to composite crystals of K-doped TiO2 anatase. The films exhibit excellent stability over multiple cycles, attributed to the K-doping and nanostructure.
研究不足
The study uses specific materials and conditions (e.g., TiC and Ti powders with certain sizes, treatment at 400°C), which may limit generalizability. The photocatalytic activity is evaluated only with MB degradation, and other pollutants or conditions are not tested. The nanosheet structure is only observed for TiC content below 40%, indicating potential constraints in material composition.
1：Experimental Design and Method Selection:
The study involves preparing K-doped TiO2 films using molten-salt treatment in KNO3 at 400°C for 3 hours on TiC-Ti coatings with varying TiC content (0% to 100%). The design aims to investigate the influence of TiC amount on nanosheet formation and photocatalytic activity.
2：Sample Selection and Data Sources:
Samples are TiC-Ti coatings on Al2O3 balls, prepared with TiC powder (average diameter: 2-5 μm) and Ti powder (average diameter: 30 μm) via mechanical coating operation. Data sources include characterization techniques like XRD, Raman spectroscopy, SEM, EDS, and XPS.
3：List of Experimental Equipment and Materials:
Equipment includes XRD (D8 Advance with Cu-Kα radiation), Raman spectroscopy (Horiba Scientific with Ar laser radiation at 514.5 nm), SEM (JSM-5300), EDS (JSM-5300LV), XPS (Escalab 250Xi), UV light lamps (FL20S BLB, Toshiba). Materials include TiC powder, Ti powder, Al2O3 balls, KNO3, methylene blue (MB) solution.
4：5 nm), SEM (JSM-5300), EDS (JSM-5300LV), XPS (Escalab 250Xi), UV light lamps (FL20S BLB, Toshiba). Materials include TiC powder, Ti powder, Al2O3 balls, KNO3, methylene blue (MB) solution.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Coatings are treated with molten KNO3 at 400°C for 3 h. Characterization involves XRD, Raman, SEM, EDS, XPS. Photocatalytic activity is evaluated using MB degradation under UV light (irradiance 1 mW/cm2), with pre-drying under UV for 24 h and adsorption in dark for 12 h repeated twice to avoid adsorption effects. Cycle tests are conducted eight times.
5：Data Analysis Methods:
Data is analyzed using techniques such as peak identification in XRD and Raman spectra, elemental composition from EDS, valence states from XPS, and degradation rates from MB concentration measurements.
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