Visible- light active zinc doped cobalt oxide (Zn-Co3O4) nanoparticles for photocatalytic and photochemical activity

Reena, R. Sylvia; Aslinjensipriya, A.; Infantiya, S. Grace; Britto, J. Daniel John; Jose, M.; Das, Satya P.

doi:10.1016/j.matpr.2022.05.167

Cited by 3 publications

(1 citation statement)

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“…Frontiers in Chemistry frontiersin.org gap, good charge transportability and p-type semiconducting nature (Cao et al, 2022;Wang et al, 2023). Moreover, the successful contribution of Co 3 O 4 in enhancing the photocatalytic activity of CeO 2 , g-C 3 N 4 , TiO 2 , Bi 2 O 3 and Fe 2 O 3 while generating photoexcitons' separation is well established (Ranjith et al, 2019;Niu et al, 2022;Reena et al, 2022). Previously, rare studies are available for the removal of imidacloprid over MoO 3 -based photocatalysts (Adabavazeh et al, 2021;Zhang et al, 2021).…”

Section: Figurementioning

confidence: 99%

Photocatalytic removal of imidacloprid containing frequently applied insecticide in agriculture industry using Co3O4 modified MoO3 composites

et al. 2023

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Water pollution caused by the frequent utilization of pesticides in the agriculture industry is one of the major environmental concerns that require proper attention. In this context, the photocatalytic removal of pesticides from contaminated water in the presence of metallic oxide photocatalysts is quite in approach. In the present study, Orthorhombic MoO3 has been modified with varying amount of cobalt oxide through wet impregnation for the removal of imidacloprid and imidacloprid-containing commercially available insecticide. The solid-state absorption response and band gap evaluation of synthesized composites revealed a significant extension of absorption cross-section and absorption edge in the visible region of the light spectrum than pristine MoO3. The indirect band gap energy varied from ∼2.88 eV (MoO3) to ∼2.15 eV (10% Co3O4-MoO3). The role of Co3O4 in minimizing the photo-excitons’ recombination in MoO3 was studied using photoluminescence spectroscopy. The orthorhombic shape of MoO3 was confirmed through X-ray diffraction analysis and scanning electron microscopy. Moreover, the presence of distinct absorption edges and diffraction peaks corresponding to Co3O4 and MoO3 in absorption spectra and XRD patterns, respectively verified the composite nature of 10% Co3O4-MoO3. The photocatalytic study under natural sunlight irradiation showed higher photocatalytic removal (∼98%) of imidacloprid with relatively higher rate by 10% Co3O4-MoO3 composite among all contestants. Furthermore, the photocatalytic removal (∼93%) of commercially applied insecticide, i.e., Greeda was also explored.

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Section: Figurementioning

confidence: 99%

Photocatalytic removal of imidacloprid containing frequently applied insecticide in agriculture industry using Co3O4 modified MoO3 composites

et al. 2023

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GREEN SYNTHESIS, CHARACTERIZATION AND PHOTOCATALYTIC ACTIVITY OF NEW PHOTOCATALYST SrCo₂O₄ UNDER VISIBLE LIGHT IRRADIATION

BOUMETHRED,

BENHEBAL,

SEBBAH

et al. 2024

Surf. Rev. Lett.

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In order to reduce the enormous costs of photocatalytic processes, the development of new photocatalysts sensitive to visible light constitutes a promising strategy to boost the efficiency of this method in water treatment. In this paper, strontium cobaltite nanoparticles (SrCo2O4 NPs) were shaped by simple, ecological and economical methods using cobalt and strontium nitrates as precursor and freshly isolated chicken egg white as capping agents. The crystalline product SrCo2O4 NPs was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Ultraviolet–Visible (UV–Vis) spectroscopy studies. The SrCo2O4-catalyzed Congo red (CR) degradation under visible light is investigated. XRD analysis showed that the sample was indeed crystallized in the cubic spinel structure (space group Fd3m). The average size of the nanoparticles was estimated to be ∼28[Formula: see text]nm. The FT-IR spectrum shows two bands at 620 and 573[Formula: see text][Formula: see text], which are characteristic of the spinel strontium cobaltite crystalline structure. The two optical band gap energy of synthesized photocatalyst estimated from UV–Visible spectrum is 2.07 and 3.48[Formula: see text]eV. The developed photocatalyst exhibits significant photocatalytic degradation of RC in an acidic medium with 97% of the dye mineralized after 5[Formula: see text]h.

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Green Synthesis and Characterizations of Cobalt Oxide Nanoparticles and Their Coherent Photocatalytic and Antibacterial Investigations

Parvathiraja

Wabaidur

Sharma

et al. 2023

Water

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Water pollution is a serious concern for developing and undeveloped countries. Photocatalytic degradation of organic pollutants is an effective degradation method to restrain the green ecosystem. This research article presents a green, low-cost, and benevolent eco-friendly biosynthesis of cobalt oxide (Co3O4) nanoparticles using Curcuma longa plant extract. The UV and visible region absorbance of Co3O4 nanoparticles estimated the Co2+ and Co3+ transitions on the lattice oxygen, and their bandgap of 2.2 eV was confirmed from the UV-DRS spectroscopy. The cubic structure and spherical shape of Co3O4 nanoparticles were estimated by using XRD and TEM characterizations. Plant molecules aggregation and their agglomerations on the nanoparticles were established from FTIR and EDX spectroscopy. Multiple cobalt valences on the oxygen surfaces and their reaction, bonding, and binding energies were analyzed from XPS measurements. The biogenic Co3O4 nanoparticles were executed against gram-positive (Staphylococcus aureus—S. aureus) and gram-negative (Escherichia coli—E. coli) bacteria. A gram-positive bacterial strain exhibited great resistivity on Co3O4 nanoparticles. Degradation of organic dye pollutants on the Co3O4 nanoparticles was performed against methylene blue (MB) dye under the conditions of visible light irradiation. Dye degradation efficiency pseudo-first-order kinetics on the pseudo-first-order kinetics denotes the rate of degradation over the MB dye. This research work achieved enhanced degradation potency against toxic organic dye and their radicals are excited from visible light irradiations. Absorption light and charged particle recombinations are reformed and provoked by the plant extract bio-molecules. In this process, there is no inferior yield development, and electrons are robustly stimulated. Furthermore, the biosynthesized Co3O4 nanoparticles determined the potency of bacterial susceptibility and catalytic efficacy over the industrial dye pollutants.

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Visible- light active zinc doped cobalt oxide (Zn-Co3O4) nanoparticles for photocatalytic and photochemical activity

Cited by 3 publications

References 19 publications

Photocatalytic removal of imidacloprid containing frequently applied insecticide in agriculture industry using Co3O4 modified MoO3 composites

Photocatalytic removal of imidacloprid containing frequently applied insecticide in agriculture industry using Co3O4 modified MoO3 composites

GREEN SYNTHESIS, CHARACTERIZATION AND PHOTOCATALYTIC ACTIVITY OF NEW PHOTOCATALYST SrCo₂O₄ UNDER VISIBLE LIGHT IRRADIATION

Green Synthesis and Characterizations of Cobalt Oxide Nanoparticles and Their Coherent Photocatalytic and Antibacterial Investigations

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Visible- light active zinc doped cobalt oxide (Zn-Co3O4) nanoparticles for photocatalytic and photochemical activity

Cited by 3 publications

References 19 publications

Photocatalytic removal of imidacloprid containing frequently applied insecticide in agriculture industry using Co3O4 modified MoO3 composites

Photocatalytic removal of imidacloprid containing frequently applied insecticide in agriculture industry using Co3O4 modified MoO3 composites

GREEN SYNTHESIS, CHARACTERIZATION AND PHOTOCATALYTIC ACTIVITY OF NEW PHOTOCATALYST SrCo2O4 UNDER VISIBLE LIGHT IRRADIATION

Green Synthesis and Characterizations of Cobalt Oxide Nanoparticles and Their Coherent Photocatalytic and Antibacterial Investigations

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GREEN SYNTHESIS, CHARACTERIZATION AND PHOTOCATALYTIC ACTIVITY OF NEW PHOTOCATALYST SrCo₂O₄ UNDER VISIBLE LIGHT IRRADIATION