Study of structural, optical, and dielectric properties of sol–gel derived ZnFe2O4–Al2O3 composite nanoparticles

Varpe, Ashwini S.; Deshpande, Mukund

doi:10.1007/s10971-020-05408-7

Cited by 15 publications

(6 citation statements)

References 20 publications

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“…Thus, as shown in figures 7II(a)-(c), the extrapolating of the linear portion of (αhν) 2 versus hν allows the determination of the direct bandgap values (E g ) and error bars that are represented in table 1 and figure 8. The bandgap of pure ZnFe 2 O 4 , which is in agreement with the earlier reported studies, is 2.88 eV [35,40]. The E g decreases gradually from 2.88 to 2.49 eV, as the NiO content increases from 0 to 50 wt.…”

Section: Resultssupporting

confidence: 91%

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Synthesis and identification of structural, optical, electrical, and magnetic properties of novel ZnFe₂O₄/NiO nanocomposites

Aridi¹,

Awad²,

Khalaf³

2021

Phys. Scr.

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Novel nanocomposites (NCs) of (100-x) ZnFe 2 O 4 /x NiO (x=0,10,20,30,40,50, and 100 wt. %) NCs have been successfully synthesized by the two-step co-precipitation method. The XRD analysis showed the formation of both phases without any impurities. The FTIR spectroscopy provided characteristic vibrations of Zn-O, Fe-O, and Ni-O, which also confirmed the coexistence of both phases and the high purity of the samples. The TEM images revealed the rounded-cubes morphology of the nanocomposites with an average particle size ranging between 17 and 27 nm. The UV-vis spectroscopy showed that the absorbance edge of the synthesized NCs was slightly red-shifted with increasing NiO content. This indicates the narrowing of the optical bandgap due to the incorporation of sub-bandgap energy levels, triggered by the interface and surface defects. Furthermore, among all the nanocomposites, the nanocomposite with x=30 wt. % NiO exhibited the lowest PL emission intensity and possibly, the highest photocatalytic activity. The DC electrical conductivity was greatly enhanced with the addition of NiO to ZnFe 2 O 4 NPs for x30 wt. %. This increase may be due to the excessive charge accumulation on the various interfaces existing in the ZnFe 2 O 4 /NiO nanocomposites with increasing NiO content. Finally, the magnetic measurements displayed that ZnFe 2 O 4 /NiO NCs have superparamagnetic behavior with soft ferromagnetic of ferrites. The saturation magnetization (Ms) increased with increasing NiO content, which is useful for better magnetic recoverable photocatalyst. In addition, the δM-H plot showed stronger exchange coupling interaction between the magnetic phases in ZnFe 2 O 4 /NiO NCs.

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Section: Resultssupporting

confidence: 91%

“…4 . Recently, a similar behavior was observed by Aridi et al[39] for ZnFe 2 O 4 /Mn 2 O 3 NCs and Varpe et al[40] for…”

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confidence: 83%

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Synthesis and identification of structural, optical, electrical, and magnetic properties of novel ZnFe₂O₄/NiO nanocomposites

Aridi¹,

Awad²,

Khalaf³

2021

Phys. Scr.

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“…The XRD pattern of ZF@γ-Al 2 O 3 indicated, besides the peaks of ZF, the presence of Al 2 O 3 prominent peaks at 37.67 • , 45.92 • , and 67.37 • , thus signifying the composite formation. Indeed, the XRD pattern of the catalyst was in good agreement with the literature [57,58].…”

Section: Xrd Analysissupporting

confidence: 88%

Fabricated Gamma-Alumina-Supported Zinc Ferrite Catalyst for Solvent-Free Aerobic Oxidation of Cyclic Ethers to Lactones

Abduh,

Al-Kahtani,

Amer

et al. 2023

Molecules

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The aim of this work was to fabricate a new heterogeneous catalyst as zinc ferrite (ZF) supported on gamma-alumina (γ-Al2O3) for the conversion of cyclic ethers to the corresponding, more valuable lactones, using a solvent-free method and O2 as an oxidant. Hence, the ZF@γ-Al2O3 catalyst was prepared using a deposition–coprecipitation method, then characterized using TEM, SEM, EDS, TGA, FTIR, XRD, ICP, XPS, and BET surface area, and further applied for aerobic oxidation of cyclic ethers. The structural analysis indicated spherical, uniform ZF particles of 24 nm dispersed on the alumina support. Importantly, the incorporation of ZF into the support influenced its texture, i.e., the surface area and pore size were reduced while the pore diameter was increased. The product identification indicated lactone compound as the major product for saturated cyclic ether oxidation. For THF as a model reaction, it was found that the supported catalyst was 3.2 times more potent towards the oxidation of cyclic ethers than the unsupported one. Furthermore, the low reactivity of the six-membered ethers can be tackled by optimizing the oxidant pressure and the reaction time. In the case of unsaturated ethers, deep oxidation and polymerization reactions were competitive oxidations. Furthermore, it was found that the supported catalyst maintained good stability and catalytic activity, even after four cycles.

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“…CdFe 2 O 4 /Al 2 O 3 nanocomposite shows the lower absorbance as compared to that of CdFe 2 O 4 nanoparticles. The band gap values are evaluated by extrapolating the linear portion of (αhν) 2 curve (Varpe et al 2020). The estimated band gap value of CdFe 2 O 4 is 1.93 eV.…”

Section: Resultsmentioning

confidence: 99%

Enhanced photocatalytic performance of CdFe2O4/Al2O3 nanocomposite for dye degradation

Varpe¹,

Deshpande²,

Tope³

et al. 2023

Environ Sci Pollut Res

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Study of structural, optical, and dielectric properties of sol–gel derived ZnFe2O4–Al2O3 composite nanoparticles

Cited by 15 publications

References 20 publications

Synthesis and identification of structural, optical, electrical, and magnetic properties of novel ZnFe₂O₄/NiO nanocomposites

Synthesis and identification of structural, optical, electrical, and magnetic properties of novel ZnFe₂O₄/NiO nanocomposites

Fabricated Gamma-Alumina-Supported Zinc Ferrite Catalyst for Solvent-Free Aerobic Oxidation of Cyclic Ethers to Lactones

Enhanced photocatalytic performance of CdFe2O4/Al2O3 nanocomposite for dye degradation

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Study of structural, optical, and dielectric properties of sol–gel derived ZnFe2O4–Al2O3 composite nanoparticles

Cited by 15 publications

References 20 publications

Synthesis and identification of structural, optical, electrical, and magnetic properties of novel ZnFe2O4/NiO nanocomposites

Synthesis and identification of structural, optical, electrical, and magnetic properties of novel ZnFe2O4/NiO nanocomposites

Fabricated Gamma-Alumina-Supported Zinc Ferrite Catalyst for Solvent-Free Aerobic Oxidation of Cyclic Ethers to Lactones

Enhanced photocatalytic performance of CdFe2O4/Al2O3 nanocomposite for dye degradation

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Synthesis and identification of structural, optical, electrical, and magnetic properties of novel ZnFe₂O₄/NiO nanocomposites

Synthesis and identification of structural, optical, electrical, and magnetic properties of novel ZnFe₂O₄/NiO nanocomposites