Effects of Lanthanum Substitution and Annealing on Structural, Morphologic, and Photocatalytic Properties of Nickel Ferrite
Nanoparticles of NiLa<sub>x</sub>Fe<sub>2−x</sub>O<sub>4</sub> ferrite spinel incorporated in a SiO<sub>2</sub> matrix were synthesized via a sol-gel method, followed by annealing at 200, 500, and 800 °C. The resulting materials were characterized via...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-12-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/24/3096 |
| _version_ | 1797379846413746176 |
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| author | Thomas Dippong Dana Toloman Mihaela Diana Lazar Ioan Petean |
| author_facet | Thomas Dippong Dana Toloman Mihaela Diana Lazar Ioan Petean |
| author_sort | Thomas Dippong |
| collection | DOAJ |
| description | Nanoparticles of NiLa<sub>x</sub>Fe<sub>2−x</sub>O<sub>4</sub> ferrite spinel incorporated in a SiO<sub>2</sub> matrix were synthesized via a sol-gel method, followed by annealing at 200, 500, and 800 °C. The resulting materials were characterized via XRD, AFM, and BET techniques and evaluated for photocatalytic activity. The XRD diffractograms validate the formation of a single-phase cubic spinel structure at all temperatures, without any evidence of secondary peaks. The size of crystallites exhibited a decrease from 37 to 26 nm with the substitution of Fe<sup>3+</sup> with La<sup>3+</sup> ions. The lattice parameters and crystallite sizes were found to increase with the rise in La<sup>3+</sup> content and annealing temperature. Isotherms were employed to calculate the rate constants for the decomposition of malonate precursors to ferrites and the activation energy for each ferrite. All nanocomposites have pores within the mesoporous range, with a narrow dispersion of pore sizes. The impact of La content on sonophotocatalytic activity was evaluated by studying Rhodamine B degradation under visible light irradiation. The results indicate that the introduction of La enhances nanocomposite performance. The prepared Ni-La ferrites may have potential application for water decontamination. |
| first_indexed | 2024-03-08T20:28:56Z |
| format | Article |
| id | doaj.art-58c783dc15f947dc869e9a0a2c66b220 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-08T20:28:56Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-58c783dc15f947dc869e9a0a2c66b2202023-12-22T14:29:01ZengMDPI AGNanomaterials2079-49912023-12-011324309610.3390/nano13243096Effects of Lanthanum Substitution and Annealing on Structural, Morphologic, and Photocatalytic Properties of Nickel FerriteThomas Dippong0Dana Toloman1Mihaela Diana Lazar2Ioan Petean3Faculty of Science, Technical University of Cluj-Napoca, 76 Victoriei Street, 430122 Baia Mare, RomaniaNational Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donath Street, 400293 Cluj-Napoca, RomaniaNational Institute for Research and Development of Isotopic and Molecular Technologies, 67-103 Donath Street, 400293 Cluj-Napoca, RomaniaFaculty of Chemistry and Chemical Engineering, Babes-Bolyai University, 11 Arany Janos Street, 400028 Cluj-Napoca, RomaniaNanoparticles of NiLa<sub>x</sub>Fe<sub>2−x</sub>O<sub>4</sub> ferrite spinel incorporated in a SiO<sub>2</sub> matrix were synthesized via a sol-gel method, followed by annealing at 200, 500, and 800 °C. The resulting materials were characterized via XRD, AFM, and BET techniques and evaluated for photocatalytic activity. The XRD diffractograms validate the formation of a single-phase cubic spinel structure at all temperatures, without any evidence of secondary peaks. The size of crystallites exhibited a decrease from 37 to 26 nm with the substitution of Fe<sup>3+</sup> with La<sup>3+</sup> ions. The lattice parameters and crystallite sizes were found to increase with the rise in La<sup>3+</sup> content and annealing temperature. Isotherms were employed to calculate the rate constants for the decomposition of malonate precursors to ferrites and the activation energy for each ferrite. All nanocomposites have pores within the mesoporous range, with a narrow dispersion of pore sizes. The impact of La content on sonophotocatalytic activity was evaluated by studying Rhodamine B degradation under visible light irradiation. The results indicate that the introduction of La enhances nanocomposite performance. The prepared Ni-La ferrites may have potential application for water decontamination.https://www.mdpi.com/2079-4991/13/24/3096nickel–lanthanum ferritecrystalline phasespecific surfacesonophotocatalysis |
| spellingShingle | Thomas Dippong Dana Toloman Mihaela Diana Lazar Ioan Petean Effects of Lanthanum Substitution and Annealing on Structural, Morphologic, and Photocatalytic Properties of Nickel Ferrite Nanomaterials nickel–lanthanum ferrite crystalline phase specific surface sonophotocatalysis |
| title | Effects of Lanthanum Substitution and Annealing on Structural, Morphologic, and Photocatalytic Properties of Nickel Ferrite |
| title_full | Effects of Lanthanum Substitution and Annealing on Structural, Morphologic, and Photocatalytic Properties of Nickel Ferrite |
| title_fullStr | Effects of Lanthanum Substitution and Annealing on Structural, Morphologic, and Photocatalytic Properties of Nickel Ferrite |
| title_full_unstemmed | Effects of Lanthanum Substitution and Annealing on Structural, Morphologic, and Photocatalytic Properties of Nickel Ferrite |
| title_short | Effects of Lanthanum Substitution and Annealing on Structural, Morphologic, and Photocatalytic Properties of Nickel Ferrite |
| title_sort | effects of lanthanum substitution and annealing on structural morphologic and photocatalytic properties of nickel ferrite |
| topic | nickel–lanthanum ferrite crystalline phase specific surface sonophotocatalysis |
| url | https://www.mdpi.com/2079-4991/13/24/3096 |
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