Effect of cobalt doping on structural parameters, cation distribution and magnetic properties of nickel ferrite nanocrystals

Debnath, Simi; Das, Avisek; Das, Ratan

doi:10.1016/j.ceramint.2021.02.095

Cited by 40 publications

(22 citation statements)

References 72 publications

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“…If no suitable charge carrier scavengers are available, the generated e− and h + pairs recombine, generating heat; however, MZ molecules can be degraded if charge separation is established. Because of its localized surface plasmon resonance effect (Braik et al 2021;Sinha 2021;Debnath et al 2021), the Co dopant can act as an electron reservoir and delayed the recombination of photoinduced charge carriers as validated by the results of the PL investigation. Also, the conversion between Co 3+ and Co 2+ (1.81 V vs NHE) gives priority to capture electrons, hence can inhibit electron-hole pair recombination (Hu et al 2018).…”

Section: Active Radicals Trapping Test and Metronidazole Uv-catalytic Degradation Mechanismmentioning

confidence: 80%

“…As previously stated, the tetrahedral and octahedral sites are strongly preferred by Zn and Ni atoms, respectively. Fe 3+ cations, on the other hand, can occupy octahedral and tetrahedral sites (Thakur et al 2016;Debnath et al 2021). According to Fig.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, cobalt (Co 2+ ) ion doping in NZF ferrite does not affect the NZF spinel phase because cobalt occupies interstitial space in the ferrite's cubic structure. However, other unidentified peaks between 21.14° − 27.5° disappeared and there was a minor change towards the lower angle in the 2θ position for each peak, which may be due to the replacement of Fe 3+ having ionic radii of 0.65 Å by Co 2+ with higher ionic radii of ~0.74 Å (Debnath et al 2021;Sinha 2021). According to the Debye Scherrer equation (D=0.9λ/β cos θ), the average crystallite size of NZF and Co−NZF was estimated from the intense peaks (220), ( 311) and ( 440) as 19.9 and 25.6 nm, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Also, note that the Co−NZF exhibited higher crystallinity, slightly lower X-ray density, decreased dislocation density and increased average lattice constant (Table 1) due to the substitution of ions with smaller ionic radii in the ferrite structure by cobalt with larger atomic radii (~0.74 Å) (Debnath et al 2021;Mustafa and Oladipo 2021). In addition, the strain has been induced in the system as a result of lattice expansion, and the positive sign indicates tensile stress (Chahal et al 2020).…”

Section: Fig3: Xrd Patterns Of the Co−nzf And Nzfmentioning

confidence: 99%

“…Motivated by the above considerations, we designed a high-performance light responsive photocatalyst for antibiotic water remediation by doping Co onto Ni0.5Zn0.5Fe2O4 nanoparticles. Since cobalt is a hard magnetic material with larger atomic radii, it affects the oxygen position, the vacancy parameter, and the magneto-crystalline anisotropy constant (Debnath et al 2021), charge transfer efficiency (Sinha 2021), and intrinsic coercivity of the pristine ferrite.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Detoxification of Antibiotic- and Bacteria-Contaminated Water using Cobalt-Doped Ni–Zn Ferrites Magnetic Separable Nanopowders

Mustafa

Oladipo

Mizwari

et al. 2021

Preprint

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Here, metronidazole (MZ) antibiotic degradation and bactericidal efficacy of Co–Ni0.5Zn0.5Fe2O4 (Co–NZF) with and without photoactivation by UV light is reported as a viable cost-competitive water disinfection solution. Co–NZF has a total pore volume of 0.298 cm3 g− 1, a specific surface area of 70.2 m2 g− 1 and sufficiently high magnetic properties (80.35 emu g− 1). After 360 min of UV–assisted irradiation at pH 3, 10 mg Co–NZF, and 4 mM H2O2, the maximum MZ degradation was reached (92.8%). The adsorption result of 10 mg Co–NZF in the dark for 12 h resulted in 70.2% MZ removal, whereas MZ self-degradation was significantly minimal in a blank trial. In the presence of interfering anions and very high molecular weight tylosin antibiotic, Co–NZF maintained 51.7–75.4% degradation efficiency. The effect of the Co–NZF dosage on the viability of Staphylococcus aureus and Escherichia coli strains showed that 15 mg of the catalyst was sufficient to cause bactericidal activity after 180 min in the presence of UV light, while 25 mg is needed under dark conditions. In addition, when compared to Escherichia coli strains, Co–NZF showed higher inhibition against Staphylococcus aureus in time-kill experiments under dose variation.

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Section: Active Radicals Trapping Test and Metronidazole Uv-catalytic Degradation Mechanismmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Fig3: Xrd Patterns Of the Co−nzf And Nzfmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Detoxification of Antibiotic- and Bacteria-Contaminated Water using Cobalt-Doped Ni–Zn Ferrites Magnetic Separable Nanopowders

Mustafa

Oladipo

Mizwari

et al. 2021

Preprint

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Impact of Co and Cu co‐doping on the Structural, Electrical, Magnetic and Solar Light Driven Photo‐Catalytic Properties of NiFe₂O₄ Nano‐crystals for Crystal Violet Dye Removal

Bibi,

Jamshaid,

Iqbal

et al. 2024

ChemistrySelect

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Herein, we have synthesised cobalt (Co) and copper (Cu) co‐doped Ni‐ferrite Ni1‐xCoxFe2‐yCuyO4 nanocrystals (NCs) via the facile micro‐emulsion method. The materials were analysed for various physio‐chemical characterizations to investigate the co‐doping (Co and Cu) effects on magnetic, structural, electrical, photo‐catalytic properties. The structural analysis via Fourier Transform Infrared spectroscopy (FTIR) and X‐rays diffraction (XRD) showed the successful fabrication of Co and Cu co‐doped materials with cubic spinel geometry having a single phase, the crystallite size was observed in 15 to 24 nm range. The electrical response measured using current‐voltage (I–V) analysis showed good electrical features, the electrical resistivity declined from 6.85×107 Ohm.cm for un‐doped materials to 0.04×107 Ohm.cm for co‐doped materials, which was accredited due to the synergistic effects of Co and Cu metal cations in co‐doped Ni‐based ferrite structures. Magnetic investigation using VSM analysis showed increased saturation magnetization (Ms 31.32 to 50.75 emu/g) and coercivity (218.76 to 406.82 Oe) because of the higher magnetic responses of Co2+ions in the co‐doped spinel ferrite NCs. BET surface‐area analysis showed good porosity for co‐doped materials with an increased surface area of 52 to 104 m2/g on co‐doping. The Tauc's plot described the decline of band‐gap energies value (Egs) (1.99 eV) in co‐doped (x=y=0.56) materials as compared to (2.16 eV) of the un‐doped NiFe2O4 materials, which is due to more electrical responses of Co and Cu co‐dopant cations that possess higher energy levels, which can stabilize the charge carrier‘s species. Furthermore, the photo‐degradation using solar light showed good removal of crystal violet (CV) dye, which was almost 94.14 % by co‐doped material; however, by un‐doped material, it was 38.044 %. The scavenger experiment shows that the (OH⋅) hydroxyl radicals and (e−/h+) species play a prime role in the degradation of CV dye. Recycling and recoverability tests for five cycles’ exhibited outstanding stability of the photocatalyst with only 1.7 % losses in activity. Overall, our results showed that co‐doped Ni1‐xCoxFe2‐yCuyO4 NCs materials exhibited enhancement in the magnetic, electrical, photo‐catalytic properties and a decline in band‐gap energy values as compared to un‐doped NiFe2O4, which might have potential use in magnetic and electrical devices as well as solar‐driven photo‐catalyst materials for the remediation of environmental pollution.

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Intensive analysis of uncoated and surface modified Co-Zn nanoferrite as a heat generator in magnetic fluid hyperthermia applications

et al. 2022

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Effect of cobalt doping on structural parameters, cation distribution and magnetic properties of nickel ferrite nanocrystals

Cited by 40 publications

References 72 publications

Photocatalytic Detoxification of Antibiotic- and Bacteria-Contaminated Water using Cobalt-Doped Ni–Zn Ferrites Magnetic Separable Nanopowders

Photocatalytic Detoxification of Antibiotic- and Bacteria-Contaminated Water using Cobalt-Doped Ni–Zn Ferrites Magnetic Separable Nanopowders

Impact of Co and Cu co‐doping on the Structural, Electrical, Magnetic and Solar Light Driven Photo‐Catalytic Properties of NiFe₂O₄ Nano‐crystals for Crystal Violet Dye Removal

Intensive analysis of uncoated and surface modified Co-Zn nanoferrite as a heat generator in magnetic fluid hyperthermia applications

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Effect of cobalt doping on structural parameters, cation distribution and magnetic properties of nickel ferrite nanocrystals

Cited by 40 publications

References 72 publications

Photocatalytic Detoxification of Antibiotic- and Bacteria-Contaminated Water using Cobalt-Doped Ni–Zn Ferrites Magnetic Separable Nanopowders

Photocatalytic Detoxification of Antibiotic- and Bacteria-Contaminated Water using Cobalt-Doped Ni–Zn Ferrites Magnetic Separable Nanopowders

Impact of Co and Cu co‐doping on the Structural, Electrical, Magnetic and Solar Light Driven Photo‐Catalytic Properties of NiFe2O4 Nano‐crystals for Crystal Violet Dye Removal

Intensive analysis of uncoated and surface modified Co-Zn nanoferrite as a heat generator in magnetic fluid hyperthermia applications

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Impact of Co and Cu co‐doping on the Structural, Electrical, Magnetic and Solar Light Driven Photo‐Catalytic Properties of NiFe₂O₄ Nano‐crystals for Crystal Violet Dye Removal