Photocatalytic, structural and optical properties of Ce–Ni co-doped ZnO nanodisks-like self-assembled structures

Costa-Silva, M.; Araújo, Francisca Pereira de; Guerra, Y.; Viana, Bartolomeu C.; Silva-Filho, Edson C.; Osajima, Josy A.; Almeida, Luciano C.; Skovroinski, E.; Peña-Garcia, R.

doi:10.1016/j.matchemphys.2022.126814

Cited by 32 publications

(20 citation statements)

References 91 publications

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“…Different morphologies have been obtained for the ZnO compound (flowers, rods, disks, hexagons, etc. ), which are highly reliant on pH, temperature and synthesis methods [ 32 , 57 , 58 , 59 ]; however, hemisphere-like structures are not very common, which leads us to assume that there is a solid influence of Er 3+ and Cr 3+ cations on the ZnO morphology, possibly favoring the nucleation and growth mechanisms. Finally, Figure 3 b shows the EDS spectrum of the compound Zn 0.94 Er 0.02 Cr 0.04 O, where characteristic peaks of the Zn, O, Er and Cr elements can be observed, which certify the hexagonal structure formation, as well as the replacement of Zn 2+ cations by Er 3+ and Cr 3+ cations in the host lattice.…”

Section: Resultsmentioning

confidence: 99%

“…In the third reuse, the photocatalytic response of the material is 21.3%. The decrease in the rate of degradation in reuse cycles can occur due to mass loss and the photocorrosion process of the ZnO when subjected to UV radiation [ 14 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

“…The nauplii were cultivated in a synthetic saline solution with constant illumination for 48 h. After this time, the nauplii were added to the solution containing MB dye-irradiated and synthetic saline solution (1:1 v / v ). The survival rate of Artemia salina was evaluated after 24 h and 48 h [ 32 ].…”

Section: Methodsmentioning

confidence: 99%

“…Co-doping processes have been used as a new strategic approach to improve the photocatalytic capacity of semiconductor materials [ 32 , 33 , 34 ]. In this sense, the present work aimed to investigate the effect of Er 3+ and Cr 3+ cations’ simultaneous addition on the structural, morphological and optical properties, as well as in the photocatalytic response of the ZnO hemisphere-like structure synthetized by co-precipitation.…”

Section: Introductionmentioning

confidence: 99%

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Photoresponsive Activity of the Zn0.94Er0.02Cr0.04O Compound with Hemisphere-like Structure Obtained by Co-Precipitation

et al. 2023

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In this work, a ZnO hemisphere-like structure co-doped with Er and Cr was obtained by the co-precipitation method for photocatalytic applications. The dopant’s effect on the ZnO lattice was investigated using X-ray diffraction, Raman, photoluminescence, UV-Vis and scanning electron microscopy/energy dispersive spectroscopy techniques. The photocatalytic response of the material was analyzed using methylene blue (MB) as the model pollutant under UV irradiation. The wurtzite structure of the Zn0.94Er0.02Cr0.04O compound presented distortions in the lattice due to the difference between the ionic radii of the Cr3+, Er3+ and Zn2+ cations. Oxygen vacancy defects were predominant, and the energy competition of the dopants interfered in the band gap energy of the material. In the photocatalytic test, the MB degradation rate was 42.3%. However, using optimized H2O2 concentration, the dye removal capacity reached 90.1%. Inhibitor tests showed that •OH radicals were the main species involved in MB degradation that occurred without the formation of toxic intermediates, as demonstrated in the ecotoxicity assays in Artemia salina. In short, the co-doping with Er and Cr proved to be an efficient strategy to obtain new materials for environmental remediation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photoresponsive Activity of the Zn0.94Er0.02Cr0.04O Compound with Hemisphere-like Structure Obtained by Co-Precipitation

et al. 2023

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“…22,23 ZnO NPS have also been reported to show similar activity. [24][25][26] These particles are often synthesized following green synthesis routes. 27,28 NPs þ photon energy…”

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Photocatalytic degradation of metronidazole (MNZ) antibiotic by CuO nanoparticles for environmental protection from pharmaceutical pollution

Banu

Rashid

Tofail

et al. 2023

Surface & Interface Analysis

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Metronidazole (MNZ) is one of the extensively consumed generic antibiotics, which, due to its high resistance to biological degradation, is considered a potent environmental contaminant. In this study, we use CuO nanoparticles (NPs) for photocatalytic degradation of MNZ. Photocatalytic NPs with a crystallinity of over 80% were synthesized using a facile co‐precipitation method followed by calcination at a temperature of 500°C for a duration of 1 h. NPs were characterized thoroughly to investigate their opto‐structural properties. We investigated the efficiency of photocatalytic degradation with the variation of MNZ concentration, NP loading and the pH of the MNZ solution. Experimental results revealed that the pH of the MNZ solution strongly controlled the photocatalytic degradation efficiency. As pH was increased from 7 to 11, the degradation rate was enhanced remarkably. Degradation efficiency was also found to be strongly dependent on the concentration of both MNZ solution and CuO NPs.

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Construction of Pd‐Co‐Doped CdS Heterojunctions as Efficient Platforms in Photocatalysis

Paraschoudi

Bairamis

Sygellou

et al. 2023

Chemistry A European J

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Photocatalytic, structural and optical properties of Ce–Ni co-doped ZnO nanodisks-like self-assembled structures

Cited by 32 publications

References 91 publications

Photoresponsive Activity of the Zn0.94Er0.02Cr0.04O Compound with Hemisphere-like Structure Obtained by Co-Precipitation

Photoresponsive Activity of the Zn0.94Er0.02Cr0.04O Compound with Hemisphere-like Structure Obtained by Co-Precipitation

Photocatalytic degradation of metronidazole (MNZ) antibiotic by CuO nanoparticles for environmental protection from pharmaceutical pollution

Construction of Pd‐Co‐Doped CdS Heterojunctions as Efficient Platforms in Photocatalysis

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