研究目的
Investigating the effect of solvent polarity on the photocatalytic properties of ZnFe2O4 nanoparticles fabricated by solvothermal method.
研究成果
The higher polarity of the solvents leads to the formation of smaller diameter ZnFe2O4 nanoparticles, which exhibit larger band gaps and lower recombination rates of photoinduced e-/h+ pairs, resulting in higher photocatalytic efficiency. The photocatalytic efficiencies of the ZFO/H2O, ZFO/EG, and ZFO/EM were found to be 85.42%, 61.11%, and 51.19%, respectively, aligning with the order of solvent polarity (H2O>EG>EM).
研究不足
The study focuses on the effect of solvent polarity on the photocatalytic properties of ZnFe2O4 nanoparticles, but does not explore the potential effects of other solvent properties such as boiling point or molecular weight in depth. Additionally, the study is limited to three specific solvents (H2O, EG, EM), and the findings may not be generalizable to other solvents.
1：Experimental Design and Method Selection:
ZnFe2O4 nanoparticles were synthesized using a solvothermal method with water, ethylene glycol (EG), and methylgiycol (EM) as solvents to study the effect of solvent polarity on nanoparticle morphology and photocatalytic performance.
2：Sample Selection and Data Sources:
Zinc acetate dihydrate, ferric chloride crystal, polyvinyl pyrrolidone (PVP), sodium acetate anhydrous, Potassium hydroxide (KOH), ethylene glycol (EG), and methylgiycol (EM) were used as received without further purification.
3：List of Experimental Equipment and Materials:
X-ray diffraction (XRD, Rigaku, TTR-III, Cu Ka radiation, Japan), scanning electron microscopy (SEM, SIRION, HITACHIS-4800), transmission electron microscopy (TEM, JEM-2100), UV–vis diffuse reflectance spectroscopy (UV-3600, Shimadzu), photoluminescence analysis (PL Edinburgh FLS 980 apparatus), and a Xe lamp as the visible light source.
4：Experimental Procedures and Operational Workflow:
The ZnFe2O4 nanoparticles were synthesized by dissolving the reactants in the respective solvents, heating in a Teflon-lined stainless steel autoclave at 200°C for 12 h, followed by centrifugation, washing, drying, and annealing at 500°C for 2 h in air atmosphere.
5：Data Analysis Methods:
The photocatalytic activity was measured by the degradation of methylene blue (MB) under visible light, and the concentration was measured by a 722 UV–Visible Spectrophotometer.
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X-ray diffraction
TTR-III
Rigaku
Characterization of the samples
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UV–vis diffuse reflectance spectroscopy
UV-3600
Shimadzu
Examination of optical properties
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photoluminescence analysis
FLS 980
Edinburgh
Examination of optical properties
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scanning electron microscopy
SIRION, HITACHIS-4800
Characterization of the samples
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transmission electron microscopy
JEM-2100
Characterization of the samples
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Xe lamp
Visible light source
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UV–Visible Spectrophotometer
722
Measurement of concentration
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