Impact of Gd3+ doping on structural, electronic, magnetic, and photocatalytic properties of MnFe2O4 nanoferrites and application in dye-polluted wastewater remediation

Kumar, Arvind S.; Gora, Mahendra Kumar; Lal, Ganesh; Choudhary, B. L.; Meena, Parmeshwar Lal; Dhaka, R. S.; Singhal, R. K.; Kumar, Sudhish; Dolia, S. N.

doi:10.1007/s11356-022-23420-y

Cited by 15 publications

(8 citation statements)

References 60 publications

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“…9c, the R3c (GFO9) and R3c based composites show relative lower polarization than that of Pbnm GFO due to the lower crystal symmetry of Pbnm structure. This result agrees well with literatures in which the orthorhombic phase of GdFeO 3 also exhibited stronger polarization-electric properties than rhombohedral and cubic phases [45].…”

Section: Dielectric Magnetic and Polarization Studysupporting

confidence: 93%

“…7d are in good agreement with literatures [40], con rming the 3 + oxidation state of Gd. The deconvoluted sub-peaks demonstrate the spin-orbit coupling from the interaction of 4d and 4f valence electrons in this composite [45].…”

Section: Morphology and Chemical States Of Gfo/mxene Compositesmentioning

confidence: 87%

“…In Fig. 7d, due to the electrostatic interactions between the 4d hole and 4f 7 valence electrons, two nal ionic states (9D and 7D) were formed and the Gd4d peaks were separated into asymmetric spin-orbit doublets Gd4d 5/2 and Gd4d 3/2 at 143.11 and 146.25 eV with a spin-orbit energy separation of 3.14 eV [45]. The line shape and the peak positions of the Gd4d in Fig.…”

Section: Morphology and Chemical States Of Gfo/mxene Compositesmentioning

confidence: 93%

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Crystal structure engineering of GdFeO3/Mxene composites with excellent electromagnetic wave absorption: role of phase transition and high polarizability

Chen

2023

Preprint

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The development of new materials that can absorb electromagnetic waves (EMW) is needed to address the problem of signal interference and crosstalk. In this study, a new composite material consisting of MXene and GdFeO3 nanoparticles has been synthesized using crystal structure engineering to improve EMW attenuation performance between 2 and 18 GHz. The GFO nanoparticles, with a size of 30–40 nm, are evenly distributed on the surface of the MXene layers. The XRD and Raman spectra of the composite material show different phases of GdFeO3, which have different crystal symmetries and coordination states. The XPS and EPR measurements indicate the coexistence of various valence states of Fe, which leads to oxygen vacancies in the lattice. The addition of MXene greatly increased the specific surface area and dielectric properties of the composite material. Due to the improved polarization and phase transition behavior, the P-E loop, DM constant, and attenuation constant were significantly enhanced. The combination of good ferroelectric GdFeO3 and disordered crystal phase into the multilayered MXene matrix resulted in an enhancement of conductive and magnetic losses. Experimental results demonstrated that the Pbnm GdFeO3/MXene composites exhibited excellent EMW absorption performance. At a thickness of 4 mm, the minimum reflection loss was − 61.5 dB, and a maximum effective absorption bandwidth of 8.62 GHz was achieved at 10.8 GHz due to the good dielectric, magnetic, and multiple reflections contributing to superior EMW absorption performance with a broad band.

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Section: Dielectric Magnetic and Polarization Studysupporting

confidence: 93%

Section: Morphology and Chemical States Of Gfo/mxene Compositesmentioning

confidence: 87%

Section: Morphology and Chemical States Of Gfo/mxene Compositesmentioning

confidence: 93%

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Crystal structure engineering of GdFeO3/Mxene composites with excellent electromagnetic wave absorption: role of phase transition and high polarizability

Chen

2023

Preprint

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“…44,45 While the broad shoulder peaks at around 643.4-643.7 eV correspond to the existence of Mn 4+ in the samples. 45,46 Additionally, a weak peak at around 639.2 eV could be noticed in the tted Mn 2p 3/2 peak in sample MnF-2 which is also attributable to the contribution from Mn 2+ . 44 The high-resolution XPS spectra of the core level Fe 2p region (Fig.…”

Section: X-ray Photoelectron Spectroscopy Studymentioning

confidence: 90%

“…The Fe 2p 3/2 peaks can be effectively tted into two peaks at 709.5-709.9 eV and 711.1-712.0 eV, which are attributed to the presence of Fe 3+ ions located in the octahedral and tetrahedral sites, respectively as reported earlier. 46,47 Similarly, the Fe 2p 1/2 peaks at 723.6-723.8 eV conrm the presence of Fe 3+ ions in the octahedral sites of the spinel. Additionally, the presence of a satellite peak in the region 717.7-718.0 eV conrms the existence of Fe in the Fe 3+ state in all samples.…”

Section: X-ray Photoelectron Spectroscopy Studymentioning

confidence: 99%

Ultrasonic irradiation-assisted MnFe₂O₄ nanoparticles catalyzed solvent-free selective oxidation of benzyl alcohol to benzaldehyde at room temperature

Kalita,

Iraqui,

Borgohain

et al. 2023

RSC Adv.

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Photocatalytic activity of polyaniline‐potassium doped nickel oxide nanocomposites: A comprehensive investigation on multifaceted properties

Bhankhar,

Saini,

Sehrawat

et al. 2024

J of Applied Polymer Sci

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Polyaniline‐potassium doped nickel oxide nanocomposites (PANI/KNO) were efficiently synthesized via an in situ chemical oxidation method, meticulously confirmed by comprehensive x‐ray diffraction, Fourier transformation infrared spectroscopy, energy dispersive x‐ray spectroscopy, selected area electron diffraction, and x‐ray photoelectron spectroscopy analyses. The crystallite size and strain exhibited distinct behaviors, while field emission scanning electron microscopy revealed a blend of irregular spherical shapes and nanofibers, further confirmed by high resolution transmission electron microscopy. These composites exhibited significantly enhanced thermal stability, surpassing PANI by 1.39 times, and showcased a band gap exceeding 3 eV, along with multiple photoluminescence peaks at room temperature (RT). Moreover, their RT AC conductivity experienced a remarkable surge by 4.91 times compared to pure polyaniline. Jonscher's Power Law model and the Havriliak–Negami relaxation model are employed to elucidate the electrical properties of composite materials. The composites displayed nonDebye relaxation behavior with increased conductivity, as observed through impedance analysis, electrical modulus evaluation, and dielectric constant assessment. Additionally, evident superparamagnetic properties and multiple magnetic domains further contributed to their effectiveness. The PANI/KNO composite demonstrated photocatalytic efficiency, achieving over 90% degradation of methylene blue dye across four cycles, thus highlighting its superior photostability. Furthermore, investigations into its response to pH variations and scavenger activity underscored its immense potential for highly effective photocatalytic applications.

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Impact of Gd3+ doping on structural, electronic, magnetic, and photocatalytic properties of MnFe2O4 nanoferrites and application in dye-polluted wastewater remediation

Cited by 15 publications

References 60 publications

Crystal structure engineering of GdFeO3/Mxene composites with excellent electromagnetic wave absorption: role of phase transition and high polarizability

Crystal structure engineering of GdFeO3/Mxene composites with excellent electromagnetic wave absorption: role of phase transition and high polarizability

Ultrasonic irradiation-assisted MnFe₂O₄ nanoparticles catalyzed solvent-free selective oxidation of benzyl alcohol to benzaldehyde at room temperature

Photocatalytic activity of polyaniline‐potassium doped nickel oxide nanocomposites: A comprehensive investigation on multifaceted properties

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Impact of Gd3+ doping on structural, electronic, magnetic, and photocatalytic properties of MnFe2O4 nanoferrites and application in dye-polluted wastewater remediation

Cited by 15 publications

References 60 publications

Crystal structure engineering of GdFeO3/Mxene composites with excellent electromagnetic wave absorption: role of phase transition and high polarizability

Crystal structure engineering of GdFeO3/Mxene composites with excellent electromagnetic wave absorption: role of phase transition and high polarizability

Ultrasonic irradiation-assisted MnFe2O4 nanoparticles catalyzed solvent-free selective oxidation of benzyl alcohol to benzaldehyde at room temperature

Photocatalytic activity of polyaniline‐potassium doped nickel oxide nanocomposites: A comprehensive investigation on multifaceted properties

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Resources

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Ultrasonic irradiation-assisted MnFe₂O₄ nanoparticles catalyzed solvent-free selective oxidation of benzyl alcohol to benzaldehyde at room temperature