Influence of pH on the structural and magnetic properties of Fe-doped ZnO nanoparticles synthesized by sol gel method

Castro-Lopes, S.; Guerra, Y.; Silva-Sousa, A.; Oliveira, Danilo; Gonçalves, Lillian; Franco, A.; Padrón-Hernández, E.; Peña-Garcia, R.

doi:10.1016/j.solidstatesciences.2020.106438

Cited by 42 publications

(20 citation statements)

References 37 publications

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“…The lattice parameters ( a and c ) are calculated using the equation that correlates the interplanar spacing, Miller indices and the lattice constants for the ZnO with hexagonal structure [ 36 ]. The calculated values for a and c are 3.2468(1) Å and 4.9482(3) Å, respectively, which are smaller than the recently reported values for ZnO [ 37 ].…”

Section: Resultsmentioning

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%

“…The Scherrer equation [ 36 ] was used to estimate the average crystallite size (D) and the value obtained was 86 nm. This result is four times higher than the value reported for ZnO nanostructures by Rocha et al [ 37 ].…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2023

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“…This equation is known from the uniform deformation model because the microstrain should be the same in all crystallographic orientations [25]. In the W-H plot, the diffraction domain is isotropic, representing a uniform deformation model for all crystallographic directions [26].…”

Section: Resultsmentioning

confidence: 99%

THE EFFECT OF ADDITIONAL IRON SAND ON THE CRYSTAL SIZE AND STRAIN OF ZnO

Lorna

Mutmainna

Tahir

et al. 2022

IPR

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This study observed the effect of the addition of iron (Fe) doping on the characteristics of Zinc Oxide (ZnO) nanoparticles.Zn(1-x)Fe(x) with various concentration of x = 0, 2, 4, 6, 8, and 10% was prepared by coprecipitation method using Sodium Hydroxide and Hydrogen Chloride. The effect of adding Fe doping on ZnO was characterized using X-ray Diffraction (XRD) to determine the crystal structure, size, and strain. The analysis result confirmed the absence of additional impurity peaks in the ZnO nanoparticles. Fe doping affects the Zn lattice structure. X-ray diffraction (XRD) study confirms the crystalline Hexagonal structure. Crystal size analysis using Debye Scherrer, UDM, and Halder-Wagner method obtained varying crystal sizes with variations in the concentration of Fe ranging from 19.89-44.72 nm. The crystal size and strain obtained from the Debye Scherrer method are smaller

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“…No secondary or undesirable phases were observed for the ZnO-Ce sample, suggesting its incorporation in the ZnO hexagonal structure. For both samples, the lattice constants a and c were calculated using Equation (2) [ 37 ]:

…”

Section: Resultsmentioning

confidence: 99%

“…Comparing the lattice constant values of the ZnO sample with the ZnO-Ce sample, there was a significant increase, which may be associated with the differences between the ionic radii of Zn (0.74 Å) and Ce (0.97 Å) [ 38 ]. On the other hand, the average crystallite sizes ( D ) and the lattice strain (ε) of samples were estimated using the Williamson–Hall equation [ 37 ]. For ZnO and ZnO-Ce samples, the D and ε values are 22 nm and 12 nm and 0.21 × 10 −3 % and 0.28 × 10 −3 %, respectively.…”

Section: Resultsmentioning

confidence: 99%

A Brief Photocatalytic Study of ZnO Containing Cerium towards Ibuprofen Degradation

et al. 2021

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Ibuprofen (IBU) is one of the most-sold anti-inflammatory drugs in the world, and its residues can reach aquatic systems, causing serious health and environmental problems. Strategies are used to improve the photocatalytic activity of zinc oxide (ZnO), and thosethat involvethe inclusion of metalhave received special attention. The aim of this work was to investigate the influence of the parameters and toxicity of a photoproduct using zinc oxide that contains cerium (ZnO-Ce) for the photodegradation of ibuprofen. The parameters include the influence of the photocatalyst concentration (0.5, 0.5, and 1.5 g L−1) as well as the effects of pH (3, 7, and 10), the effect of H2O2, and radical scavengers. The photocatalyst was characterized by Scanning Electron Microscopy-Energy Dispersive Spectroscopy, Transmission electron microscopy, Raman, X-Ray Diffraction, surface area, and diffuse reflectance. The photocatalytic activity of ibuprofen was evaluated in an aqueous solution under UV light for 120 min. The structural characterization by XRD and SEM elucidated the fact that the nanoparticle ZnO contained cerium. The band gap value was 3.31 eV. The best experimental conditions for the photodegradation of IBU were 60% obtained in an acidic condition using 0.50 g L−1 of ZnO-Ce in a solution of 20 ppm of IBU. The presence of hydrogen peroxide favored the photocatalysis process. ZnO-Ce exhibited good IBU degradation activity even after three photocatalytic cycles under UV light. The hole plays akey role in the degradation process of ibuprofen. The toxicity of photolyzed products was monitored against Artemia salina (bioindicator) and did not generate toxic metabolites. Therefore, this work provides a strategic design to improve ZnO-Ce photocatalysts for environmental remediation.

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Influence of pH on the structural and magnetic properties of Fe-doped ZnO nanoparticles synthesized by sol gel method

Cited by 42 publications

References 37 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

THE EFFECT OF ADDITIONAL IRON SAND ON THE CRYSTAL SIZE AND STRAIN OF ZnO

A Brief Photocatalytic Study of ZnO Containing Cerium towards Ibuprofen Degradation

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