研究目的
Investigating the photocatalytic degradation of methylene blue (MB) dye using a-Fe2O3 nanoparticles synthesized via phase transformation under UV light irradiation.
研究成果
The a-Fe2O3 nanoparticles synthesized via phase transformation showed effective photocatalytic degradation of MB dye under UV light, with up to 92% degradation achieved under optimal conditions. The reaction followed pseudo-first order kinetics.
研究不足
The challenge of completely transforming all nanoparticles into a-Fe2O3 phase and the need to control various parameters like pH, concentration, types of iron salts, alkali solution, and reaction time for optimal results.
1：Experimental Design and Method Selection:
The a-Fe2O3 nanoparticles were synthesized by co-precipitation method involving chemical precipitation of aqueous salts of iron using NaOH aqueous solution, followed by phase transformation at 550°C.
2：Sample Selection and Data Sources:
Aqueous solutions of FeSO
3：7H2O and FeCl6H2O were used as precursors. List of Experimental Equipment and Materials:
Magnetic stirrer, muffle furnace, UV lamp (Philips; 19 W), centrifuge.
4：Experimental Procedures and Operational Workflow:
The mixture of iron salts was stirred vigorously, NaOH was added dropwise, the precipitate was collected, washed, dried, and calcined. Photocatalytic degradation was carried out under UV light.
5：Data Analysis Methods:
The photocatalytic degradation was analyzed by plotting ln(Ct/C0) versus time to determine the reaction kinetics.
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