Oxygen-deficient lanthanum doped cerium oxide nanoparticles for potential applications in spintronics and photocatalysis

Chahal, Surjeet; Singh, Saurabh; Kumar, Ashok; Kumar, Pawan

doi:10.1016/j.vacuum.2020.109395

Cited by 75 publications

(37 citation statements)

References 50 publications

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“…Thus, CeO 2 serves as a charge transport center for the Z‐scheme CeO 2 /Bi 2 O 3 /gC 3 N 4 ternary system. The electrons in the CB of gC 3 N 4 can react with dye molecules which can produce

O H^{.}

Radicals 36 . The production of

O H^{.}

radical is confirmed using scavenger studies.…”

Section: Resultsmentioning

confidence: 80%

“…Figure 9A shows the results of the percentage of degradation of MG and RB dyes using different catalysts under the aforementioned conditions. A comparative study of the efficiency of the prepared composite toward MG and RB degradation using 0.5ZnFe 2 O 4 /0.5CeO 2 32 , Y‐doped CeO 2 , 33 Sm‐doped CeO 2, 34 CeO 2 /CdO, 35 and La‐doped CeO 2 36 under different conditions is given in Table 3. In the present study, the percentage degradation of RB dye is comparatively lesser than that of MG.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite

Devi

Mathew

Rajan

et al. 2020

Int J Applied Ceramic Tech

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An effective and facile phytogenic method was used to prepare CeO2/Bi2O3 and CeO2/Bi2O3/gC3N4 composites using Eichhornia crassipes phytoextract. The synthesized catalysts were characterized using techniques such as XRD, FTIR, UV‐DRS, PL, SEM‐EDAX, XPS, zeta potential, and TGA. These catalysts showed diverse photocatalytic and optical properties due to the alteration in the bandgap. The synthesized composites exhibited good photocatalytic activity by degrading Malachite green (MG) dye. The increase in the photocatalytic activity could be attributed to the p‐n heterojunction of the catalysts with efficient charge separation and strong oxidative ability. The modified photocatalysts showed excellent catalytic activity and reusability under visible light. The superior efficiency and its applications in environmental remediation make these catalysts a potential candidate for photocatalysis.

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“…Thus, CeO 2 serves as a charge transport center for the Z‐scheme CeO 2 /Bi 2 O 3 /gC 3 N 4 ternary system. The electrons in the CB of gC 3 N 4 can react with dye molecules which can produce

O H^{.}

Radicals 36 . The production of

O H^{.}

radical is confirmed using scavenger studies.…”

Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite

Devi

Mathew

Rajan

et al. 2020

Int J Applied Ceramic Tech

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“…Note that doping with Co ions generates oxygen vacancies, which promotes the formation of M x−1 from M x (host metal ions) (Chahal et al 2020;Kaphle et al 2019). This raises the number of M x−1 states, resulting in the creation of localized energy states closer to the conduction band and thus lowering the bandgap (Saranya et al 2014).…”

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). Table 1 lists the textural characteristics of Co−NZF and NZF.…”

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

confidence: 99%

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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“… 45 Considering the surface oxygen signal, it is reported that the area and intensity of this signal provide an indication of oxygen vacancies in the host lattice. 46 The spectra were decomposed (not shown), and the quantification of this contribution has been included in Table 2 as the O surf /O lat ratio. As observed, AuCT x samples present a greater amount of surface oxygen species than pure ceria and titania ones.…”

Section: Resultsmentioning

confidence: 99%

Au-Decorated Ce–Ti Mixed Oxides for Efficient CO Preferential Photooxidation

Infantes‐Molina

Villanova

Talon

et al. 2020

ACS Appl. Mater. Interfaces

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We investigated the photocatalytic behavior of gold nanoparticles supported on CeO 2 –TiO 2 nanostructured matrixes in the CO preferential oxidation in H 2 -rich stream (photo-CO-PROX), by modifying the electronic band structure of ceria through addition of titania and making it more suitable for interacting with free electrons excited in gold nanoparticles through surface plasmon resonance. CeO 2 samples with different TiO 2 concentrations (0–20 wt %) were prepared through a slow coprecipitation method in alkaline conditions. The synthetic route is surfactant-free and environmentally friendly. Au nanoparticles (<1.0 wt % loading) were deposited on the surface of the CeO 2 –TiO 2 oxides by deposition–precipitation. A benchmarking sample was also considered, prepared by standard fast coprecipitation, to assess how a peculiar morphology can affect the photocatalytic behavior. The samples appeared organized in a hierarchical needle-like structure, with different morphologies depending on the Ti content and preparation method, with homogeneously distributed Au nanoparticles decorating the Ce–Ti mixed oxides. The morphology influences the preferential photooxidation of CO to CO 2 in excess of H 2 under simulated solar light irradiation at room temperature and atmospheric pressure. The Au/CeO 2 –TiO 2 systems exhibit much higher activity compared to a benchmark sample with a non-organized structure. The most efficient sample exhibited CO conversions of 52.9 and 80.2%, and CO 2 selectivities equal to 95.3 and 59.4%, in the dark and under simulated sunlight, respectively. A clear morphology–functionality correlation was found in our systematic analysis, with CO conversion maximized for a TiO 2 content equal to 15 wt %. The outcomes of this study are significant advancements toward the development of an effective strategy for exploitation of hydrogen as a viable clean fuel in stationary, automotive, and portable power generators.

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Oxygen-deficient lanthanum doped cerium oxide nanoparticles for potential applications in spintronics and photocatalysis

Cited by 75 publications

References 50 publications

Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite

Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite

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

Au-Decorated Ce–Ti Mixed Oxides for Efficient CO Preferential Photooxidation

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Oxygen-deficient lanthanum doped cerium oxide nanoparticles for potential applications in spintronics and photocatalysis

Cited by 75 publications

References 50 publications

Synthesis and characterization of CeO2/Bi2O3/gC3N4 ternary Z‐scheme nanocomposite

Synthesis and characterization of CeO2/Bi2O3/gC3N4 ternary Z‐scheme nanocomposite

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

Au-Decorated Ce–Ti Mixed Oxides for Efficient CO Preferential Photooxidation

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Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite

Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite