研究目的
To modify the optical and magnetic properties of the spinel NiCr2O4 by incorporating 50 mol.% of Fe3+ for Cr3+ following an epoxide-mediated gel synthesis.
研究成果
Monophasic NiCr2O4 and NiCrFeO4 with cubic spinel structures were successfully synthesized. The introduction of Fe3+ modified both the optical and magnetic properties of NiCr2O4, reducing its catalytic efficiency for Rh-6G dye degradation. The study demonstrates the potential of these materials as multifunctional materials.
研究不足
The study focuses on the modification of NiCr2O4 properties by Fe(III) incorporation but does not explore the full range of possible substitutions or their effects in detail. The catalytic efficiency comparison is limited to Rh-6G dye degradation under UV–visible radiation.
1：Experimental Design and Method Selection:
Epoxide-mediated gel synthesis was used for the synthesis of NiCr2O4 and NiCrFeO
2：Sample Selection and Data Sources:
Nickel chloride hexahydrate, chromium chloride hexahydrate, and iron(III) nitrate nonahydrate were used as precursors.
3：List of Experimental Equipment and Materials:
NETZSCH STA-449 F3 instrument for TG and DSC, PANalytical Xpert diffractometer for PXRD, Perkin Elmer 2000 spectrometer for FTIR, Renishaw spectrometer for Raman, FEI Technai G220 electron microscope for TEM and SEM, Microsence EV9 for magnetization measurements, UV–visible spectrophotometer for diffuse reflectance spectra.
4：Experimental Procedures and Operational Workflow:
Xerogels were calcined at 1000°C for 2 h. Characterization was performed using various techniques as listed.
5：Data Analysis Methods:
Le Bail refinement of PXRD patterns, Kubelka–Munk function analysis for optical band gap estimation.
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PANalytical Xpert diffractometer
Xpert
PANalytical
Powder x-ray diffraction
-
Perkin Elmer 2000 spectrometer
2000
Perkin Elmer
FTIR spectrum recording
-
FEI Technai G220 electron microscope
Technai G220
FEI
TEM, HR-TEM, and SEM imaging
-
UV–visible spectrophotometer
Lambda 35
Perkin-Elmer
UV–visible diffuse reflectance spectra recording
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Shimadzu UV 1601
UV 1601
Shimadzu
Absorbance measurement for photocatalytic experiments
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NiCl2·6H2O
Merck
Precursor for synthesis
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CrCl3·6H2O
Central Drug House
Precursor for synthesis
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propylene oxide
Alfa Aesar
Gel formation agent
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Fe(NO3)3·9H2O
Precursor for Fe(III) incorporation
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NETZSCH STA-449 F3
STA-449 F3
NETZSCH
Thermogravimetric and differential calorimetric analysis
-
Renishaw spectrometer
Renishaw
Raman spectrum collection
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Microsence EV9
EV9
Microsence
Magnetization measurements
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