研究目的
To evaluate the changes caused in the preparation of BiOI samples in ethylene glycol (EG) by the addition of 2-propanol as the medium of reaction under microwave irradiation and to test their photocatalytic activity in the gaseous oxidation reaction of NO.
研究成果
BiOI microspheres with high visible-light photocatalytic activity were successfully synthesized using a microwave method. The sample prepared with 100% ethylene glycol showed the highest activity for NO removal, attributed to its large surface area and low rate of charge recombination. The photocatalytic mechanism involves the predominant participation of holes, electrons, and superoxide ions.
研究不足
The study focuses on the effect of solvent composition on the morphology and photocatalytic activity of BiOI under specific conditions. The scalability of the microwave synthesis method and the long-term stability of the photocatalyst under real-world conditions were not addressed.
1：Experimental Design and Method Selection:
BiOI samples were synthesized via a microwave route using different mixtures of 2-propanol and ethylene glycol as solvents. The effect of the solvent composition on the morphology and photocatalytic activity of BiOI was investigated.
2：Sample Selection and Data Sources:
Bismuth (III) nitrate pentahydrate and potassium iodide were used as precursors, dissolved in mixtures of 2-propanol and ethylene glycol.
3：List of Experimental Equipment and Materials:
Microwave reactor (Monowave 300 Anton Paar), X-ray diffractometer (Bruker D8 Advance), scanning electron microscope (FEI NOVA NanoSEM 200), UV-Vis-NIR spectrophotometer (Agilent Technologies Cary 4500), N2 physisorption equipment (Bel-Japan Minisorp II), photoluminescence spectrophotometer (Perkin Elmer LS55).
4：5).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The precursors were dissolved in the solvent mixtures, heated under microwave irradiation, cooled, filtered, washed, and dried. The samples were characterized and their photocatalytic activity was evaluated in the oxidation of NO under visible light.
5：Data Analysis Methods:
The photocatalytic activity was evaluated based on the NO conversion degree. The role of active species was investigated using scavenger agents.
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