研究目的
To study the influences of calcination temperature on morphology and structure of CeO2 nanofibers and to determine the performance of the CeO2 nanofiber catalyst for the photodegradation of aqueous Methylene Blue (MB).
研究成果
Increasing calcination temperature enhances the photocatalytic activity of CeO2 nanofibers, despite a decrease in specific surface area, indicating that factors beyond surface area, such as crystallinity and particle size, play critical roles. This suggests that higher calcination temperatures can be beneficial for improving photocatalytic efficiency in practical applications.
研究不足
The study is limited to specific calcination temperatures (500-800℃) and focuses on CeO2 nanofibers; it does not explore other materials or broader temperature ranges. Potential optimizations could include varying other synthesis parameters or testing under different photocatalytic conditions.
1：Experimental Design and Method Selection:
The study uses electrospinning combined with calcination to fabricate CeO2 nanofibers, with calcination temperatures based on TGA results. Photocatalytic activity is assessed by degradation of MB under UV irradiation.
2：Sample Selection and Data Sources:
Samples are CeO2 nanofibers calcined at 500℃, 600℃, 700℃, and 800℃. Data include TGA-DSC, SEM, XRD, BET, and UV-Vis spectrophotometry measurements.
3：0℃. Data include TGA-DSC, SEM, XRD, BET, and UV-Vis spectrophotometry measurements.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes TGA-DSC (METTLER TOLEDO), SEM (Inspect F50, FEI), XRD (DX–2000, HAOYUAN), BET (Kubo–X1000, BJBUILDER), UV-Vis spectrophotometer (UV-1700, SHIMADZU), and a 300 W mercury lamp. Materials include Ce(NO3)3·6H2O, PVP, DMF, and MB.
4：Experimental Procedures and Operational Workflow:
Electrospinning is performed with specific parameters (15 kV, 15 cm, 1.0 mL·h-1), followed by calcination at set temperatures. Characterization involves TGA-DSC for thermal analysis, SEM and XRD for morphology and structure, BET for surface area, and photocatalytic tests with MB degradation under UV light.
5：0 mL·h-1), followed by calcination at set temperatures. Characterization involves TGA-DSC for thermal analysis, SEM and XRD for morphology and structure, BET for surface area, and photocatalytic tests with MB degradation under UV light.
Data Analysis Methods:
5. Data Analysis Methods: Data are analyzed using Scherer’s equation for crystalline size, pseudo-first-order kinetics for reaction rates, and standard techniques for interpreting SEM, XRD, BET, and UV-Vis results.
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