Magnetic Properties and Photocatalytic Activity of the TiO2 Micropowders and Nanopowders Coated by Ni Nanoclusters

Japaridze, D.; Daraselia, D.; Chikvaidze, E; Nadareishvili, M. M.; Gegechkori, T. O.; Zedginidze, Tinatin; Petriashvili, Tamar; Мамниашвили, Г. И.; Shengelaya, А.

doi:10.1007/s10948-019-5088-2

Cited by 6 publications

(6 citation statements)

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“…At long deposition time, one could see apparently a strong resonance line corresponding to the room temperature superparamagnetic state formed by Co clusters and oxygen vacancies [9]. It was found that the optimal time for Co-deposition is 20 s. It is also confirmed by the analysis of the optical absorption spectra and EPR spectra [8].…”

Section: Wwwetasrcom Gegechkori Et Al: Photocatalytic and Magnetic Pr...mentioning

confidence: 60%

“…So, TiO 2 (P25) nanopowders with Ni nanocluster coatings should be more suitable for photocatalysis, not only because of the larger specific surface area, but also due to the higher specific efficiency of the surface. EPR study of the photocatalytic activity of TiO 2 /Ni nanopowders was also carried out [8].…”

Section: Wwwetasrcom Gegechkori Et Al: Photocatalytic and Magnetic Pr...mentioning

confidence: 99%

“…In this paper, we are exploring ways to improve the photocatalytic properties of TiO 2 through the coating of TiO 2 nanoparticles by various metal clusters using the results of [8][9][10] and some recent experiments. First of all, the preparation and characterization of Ni and Co coated TiO 2 nanoparticles will be described and their magnetic properties and photocatalytic activity under UV-V will be investigated.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic and Magnetic Properties of TiO2 Micro- and Nano- Powders decorated by Magnetic Cocatalysts

Gegechkori,

Mamniashvili,

Gagnidze

et al. 2023

Eng. Technol. Appl. Sci. Res.

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In this paper, photocatalytic TiO2 micro- and nano-powders coated by Ni and Co nanoclusters were prepared by the original electroless deposition method. The magnetic properties of Ni and Co nanoclusters decorating TiO2 grains were studied by the magnetometry measurements of the temperature dependence of magnetization. Their optical spectroscopy measurements showed a significant increase in light absorption by Ni and Co coated TiO2 nanopowders. The photocatalytic properties of the obtained magnetic nanopowders were studied with Electron Paramagnetic Resonance spectroscopy as well.

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Section: Wwwetasrcom Gegechkori Et Al: Photocatalytic and Magnetic Pr...mentioning

confidence: 60%

Section: Wwwetasrcom Gegechkori Et Al: Photocatalytic and Magnetic Pr...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic and Magnetic Properties of TiO2 Micro- and Nano- Powders decorated by Magnetic Cocatalysts

Gegechkori,

Mamniashvili,

Gagnidze

et al. 2023

Eng. Technol. Appl. Sci. Res.

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“…Figure 7 shows the results of the corresponding investigations: curve 1 corresponds to the absorption spectrum of ZnO thin film containing 3% of nickel impurities before decorating its surface with silver clusters and curve 2 does the same after decorating its surface. There is an obvious increase in the light absorption after the clusters are applied to the surface, but the effect is much smaller than in the case of decorating nanopowders [17]. We suggest that the reason is that the surface area is much larger in the case of nanopowders than in the case of thin films.…”

Section: Experimental Partmentioning

confidence: 68%

Investigation of the Visible Light-Sensitive ZnO Photocatalytic Thin Films

Nadareishvili

Мамниашвили

Jishiashvili

et al. 2020

Eng. Technol. Appl. Sci. Res.

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ZnO photocatalytic thin films deposited on a glass substrate are obtained by chemical spraying technique, and they are active in the visible light spectrum. Optical studies have shown that ZnO thin films doped by nickel impurities absorb visible light at wavelengths from 400nm to 600nm. At the same time, this absorption rate increases with the increase of concentration of nickel impurities. At high concentration (5%), the absorption of light is reduced in the visible area, but after heat treatment at 6000C the light absorption in these samples improves, which allows us to conclude that the observed effect is caused by a violation of the homogeneity of the distribution of nickel impurities and the creation of agglomerates. Decoration of ZnO thin film surfaces by silver clusters improves light absorption, as it happens to the nanopowders, but in the case of thin films, this effect is much smaller. Experiments on methylene blue determine the significance of photocatalytic activity in the visible area of sun irradiation of ZnO thin films containing nickel impurities, which are obtained by chemical spraying technique.

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“…In efforts to find inexpensive materials with sufficiently high activity to evolve H 2 , oxides of first-row transition metals appear promising. Oxides of Cr, 10 Mn, 11,12 Fe, 12 Co, 12,13 Ni, 12,14,15 and Cu 14,[16][17][18][19] have been shown to appreciably enhance the H 2 (or O 2 ) evolution activity of the host material. Among those compounds, nickel oxide is especially suitable for photocatalytic H 2 evolution.…”

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confidence: 99%

Critical Role of the NiO–Ni(OH)₂ Species Loaded Onto TiO₂ Photocatalyst in the Enhancement of H₂ Evolution Activity

Sudrajat¹,

Susanti²

2023

J. Electrochem. Soc.

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One of the bottlenecks in photocatalysis is to obtain reasonably cheap co-catalysts beneficially contributing to efficient photophysical and photochemical processess. Herein, we prepare a co-catalyst system consisting of Ni species embedded in anatase TiO2. We focus on clarifying its role in regulating electron behavior, and hence, photocatalytic activity. Based on the transmission electron microscopy, X-ray absorption near-edge structure, and X-ray absorption fine structure, the surface-loaded Ni species are found to exist as crystalline NiO, together with a small fraction of amorphous Ni(OH)2. Using a combination of transient microwave conductivity and static infrared absorption spectroscopy, we show that electron transfer to the Ni species instead of electron trapping by structural defects, such as oxygen vacancies or reduced titanium cations, is key mechanism responsible for the prolonged lifetime of photoexcited electrons. The prolonged electron lifetime due to an efficient electron extractionby the Ni species are behind the increased H2 evolution activity. We demonstrate that the NiO-Ni(OH)2 co-catalyst system, which works as a H2 evolution site, is auspicious to make photoexcited electrons abundantly available on the surface by localizing them, and thus, readily accessible for the desired surface reactions.

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Magnetic Properties and Photocatalytic Activity of the TiO2 Micropowders and Nanopowders Coated by Ni Nanoclusters

Cited by 6 publications

References 10 publications

Photocatalytic and Magnetic Properties of TiO2 Micro- and Nano- Powders decorated by Magnetic Cocatalysts

Photocatalytic and Magnetic Properties of TiO2 Micro- and Nano- Powders decorated by Magnetic Cocatalysts

Investigation of the Visible Light-Sensitive ZnO Photocatalytic Thin Films

Critical Role of the NiO–Ni(OH)₂ Species Loaded Onto TiO₂ Photocatalyst in the Enhancement of H₂ Evolution Activity

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Magnetic Properties and Photocatalytic Activity of the TiO2 Micropowders and Nanopowders Coated by Ni Nanoclusters

Cited by 6 publications

References 10 publications

Photocatalytic and Magnetic Properties of TiO2 Micro- and Nano- Powders decorated by Magnetic Cocatalysts

Photocatalytic and Magnetic Properties of TiO2 Micro- and Nano- Powders decorated by Magnetic Cocatalysts

Investigation of the Visible Light-Sensitive ZnO Photocatalytic Thin Films

Critical Role of the NiO–Ni(OH)2 Species Loaded Onto TiO2 Photocatalyst in the Enhancement of H2 Evolution Activity

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Critical Role of the NiO–Ni(OH)₂ Species Loaded Onto TiO₂ Photocatalyst in the Enhancement of H₂ Evolution Activity