Nonlinear optical and photocatalytic dye degradation of Co doped CeO2 nanostructures synthesized through a modified combustion technique

George, Stephy Elizabeth; George, M. C.; Alex, Javeesh; Joy, Lija K.; Aravind, Arun; Sajan, D.; Thakur, Abhishek; Hussain, Shamima; Vinitha, G.

doi:10.1016/j.ceramint.2020.02.189

Cited by 30 publications

(6 citation statements)

References 49 publications

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“…At approximately 960 cm –1 , a broad peak was observed in S-CeO 2 and all the Co-CeO 2 NPs. This peak corresponds to the bending of the intercalated Ce–O species . Moreover, a peak at about 1730 cm –1 was observed, which can be found in all samples, and the peak is mainly due to the H–O–H bending mode.…”

Section: Resultsmentioning

confidence: 78%

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Visible-Light-Induced Photocatalytic and Photoantibacterial Activities of Co-Doped CeO₂

et al. 2023

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As one of the most significant rare earth oxides, the redox ability of cerium oxide (CeO 2 ) has become the primary factor that has attracted considerable interest over the past decades. In the present study, irregular pentagonal CeO 2 (S-CeO 2 ) and different amounts of (1, 4, 8, and 12% Co) cobalt-doped CeO 2 nanoparticles (Co-CeO 2 NPs) with particle sizes between 4 and 13 nm were synthesized via the microwave-assisted synthesis method. The structural, optical, and morphological studies of S-CeO 2 and Co-CeO 2 were carried out using various techniques. The shifts in the conduction band and valence band were found to cause the reduction of the band gap energies of S-CeO 2 and Co-CeO 2 NPs. Moreover, the quenching of photoluminescence intensity with more Co doping showed the enhanced separation of charge carriers. The photocatalytic activities of S-CeO 2 and Co-CeO 2 NPs for methylene blue dye degradation, 4-nitrophenol reduction, and their photoantibacterial properties under visible-light irradiation were investigated. Findings showed that, due to the lower band gap energy (2.28 eV), more than 40% of both photocatalytic activities were observed for 12% Co-CeO 2 NPs. On the other hand, higher antibacterial impact in the presence of light shows that the Co doping has a considerable influence on the photoantibacterial response of Co-CeO 2 . Therefore, microwave-assisted synthesized CeO 2 and Co-CeO 2 NPs have shown potential in photocatalytic dye degradation, chemical reduction, and photoantibacterial activities.

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Section: Resultsmentioning

confidence: 78%

“…This peak corresponds to the bending of the intercalated Ce−O species. 38 Moreover, a peak at about 1730 cm −1 was observed, which can be found in all samples, and the peak is mainly due to the H−O−H bending mode. Based on this, S-CeO 2 and 1, 4, 8, and 12% Co-CeO 2 NPs were successfully synthesized.…”

Section: Structural Analysis Of Ceo 2 Andmentioning

confidence: 83%

Visible-Light-Induced Photocatalytic and Photoantibacterial Activities of Co-Doped CeO₂

et al. 2023

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“…The relative decrease in emission intensities of the Cu and Fe doped CeO 2 as compared to CeO 2 is strong evidence for lowering e - – h + recombination rate than pristine CeO 2 which favors the photocatalytic degradation of organic toxins. Moreover, the decrease in strong emission bands around 470 nm is attributed to the trapping of photoexcitons by the surface defects generated due to the insertion of Cu or Fe into the structure of CeO 2 ( George et al, 2020 ).…”

Section: Resultsmentioning

confidence: 99%

Transition metal doped CeO2 for photocatalytic removal of 2-chlorophenol in the exposure of indoor white light and antifungal activity

et al. 2023

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Besides natural sunlight and expensive artificial lights, economical indoor white light can play a significant role in activating a catalyst for photocatalytic removal of organic toxins from contaminated water. In the current effort, CeO2 has been modified with Ni, Cu, and Fe through doping methodology to study the removal of 2-chlorophenol (2-CP) in the illumination of 70 W indoor LED white light. The absence of additional diffractions due to the dopants and few changes such as reduction in peaks’ height, minor peak shift at 2θ (28.525°) and peaks’ broadening in XRD patterns of modified CeO2 verifies the successful doping of CeO2. The solid-state absorption spectra revealed higher absorbance of Cu-doped CeO2 whereas a lower absorption response was observed for Ni-doped CeO2. An interesting observation regarding the lowering of indirect bandgap energy of Fe-doped CeO2 (∼2.7 eV) and an increase in Ni-doped CeO2 (∼3.0 eV) in comparison to pristine CeO2 (∼2.9 eV) was noticed. The process of e-– h+ recombination in the synthesized photocatalysts was also investigated through photoluminescence spectroscopy. The photocatalytic studies revealed the greater photocatalytic activity of Fe-doped CeO2 with a higher rate (∼3.9 × 10−3 min-1) among all other materials. Moreover, kinetic studies also revealed the validation of the Langmuir-Hinshelwood kinetic model (R2 = 0.9839) while removing 2-CP in the exposure of indoor light with a Fe-doped CeO2 photocatalyst. The XPS analysis revealed the existence of Fe3+, Cu2+ and Ni2+ core levels in doped CeO2. Using the agar well-diffusion method, the antifungal activity was assessed against the fungus M. fructicola and F. oxysporum. Compared to CeO2, Ni-doped CeO2, and Cu-doped CeO2 nanoparticles, the Fe-doped CeO2 nanoparticles have outstanding antifungal properties.

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“…125 Co-doped ceria, an effective dye-degradation photocatalyst, absorbs visible light, while increasing the time of electron transfer and leading to slower hole recombination. 93 The authors note a significant nonlinear optical behavior which is enhanced over CeO 2 doped with Co which they attribute to thermal effects, however polaron behavior of the material is a candidate worth exploring.…”

Section: Visible-light Sensitization Of Ceo2mentioning

confidence: 99%

“…), the persistent 3+ sites induced by Gd or Y can reduce overall activity. 4,103 Other substitutional dopant metals include Ca, 92 Co, 93 Cr, 94 or Zr, 96 which improve photocatalytic activity by suppressing charge recombination. Efforts aiming to dope CeO 2 to improve light absorption in the visible range will be further discussed in a later section.…”

Section: Environmental Remediation/decontamination Reactionsmentioning

confidence: 99%

Nanostructured CeO₂ photocatalysts: optimizing surface chemistry, morphology, and visible-light absorption

Herzog,

Michael,

Dunkelberger

et al. 2024

Nanoscale

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Nonlinear optical and photocatalytic dye degradation of Co doped CeO2 nanostructures synthesized through a modified combustion technique

Cited by 30 publications

References 49 publications

Visible-Light-Induced Photocatalytic and Photoantibacterial Activities of Co-Doped CeO₂

Visible-Light-Induced Photocatalytic and Photoantibacterial Activities of Co-Doped CeO₂

Transition metal doped CeO2 for photocatalytic removal of 2-chlorophenol in the exposure of indoor white light and antifungal activity

Nanostructured CeO₂ photocatalysts: optimizing surface chemistry, morphology, and visible-light absorption

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Nonlinear optical and photocatalytic dye degradation of Co doped CeO2 nanostructures synthesized through a modified combustion technique

Cited by 30 publications

References 49 publications

Visible-Light-Induced Photocatalytic and Photoantibacterial Activities of Co-Doped CeO2

Visible-Light-Induced Photocatalytic and Photoantibacterial Activities of Co-Doped CeO2

Transition metal doped CeO2 for photocatalytic removal of 2-chlorophenol in the exposure of indoor white light and antifungal activity

Nanostructured CeO2 photocatalysts: optimizing surface chemistry, morphology, and visible-light absorption

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Resources

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Visible-Light-Induced Photocatalytic and Photoantibacterial Activities of Co-Doped CeO₂

Visible-Light-Induced Photocatalytic and Photoantibacterial Activities of Co-Doped CeO₂

Nanostructured CeO₂ photocatalysts: optimizing surface chemistry, morphology, and visible-light absorption