Morphology and structural development of reduced anatase-TiO2 by pure Ti powder upon annealing and nitridation: Synthesis of TiOx and TiOxNy powders

Bolokang, A.S.; Motaung, David E.; Arendse, Christopher J.; Muller, T.F.G.

doi:10.1016/j.matchar.2014.11.026

Cited by 27 publications

(16 citation statements)

References 23 publications

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“…Raman spectroscopy was used to characterize the formed phases in the Titania base catalysts (Figures 5(a) and 5(b)). All the Raman spectra present contributions at 153( ), 201( ), 403( 1 ), 525( 1 ), and 644( ) cm −1 , corresponding to the crystalline anatase phase [35,36]. Raman peaks at 245 (2nd order), 450( ), and 617( 1 ) cm −1 are attributed to rutile crystal system [35,36].…”

Section: Resultsmentioning

confidence: 96%

“…All the Raman spectra present contributions at 153( ), 201( ), 403( 1 ), 525( 1 ), and 644( ) cm −1 , corresponding to the crystalline anatase phase [35,36]. Raman peaks at 245 (2nd order), 450( ), and 617( 1 ) cm −1 are attributed to rutile crystal system [35,36]. It can be noticed that spectra show a clear diminishing in all the bands which is generally correlated with the amount of dopants [37].…”

Section: Resultsmentioning

confidence: 99%

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Influence of Phases Content on Pt/TiO₂, Pd/TiO₂Catalysts for Degradation of 4-Chlorophenol at Room Temperature

Garc

a-Zaleta

Torres‐Huerta

et al. 2016

Journal of Nanomaterials

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Different Pt/TiO2and Pd/TiO2catalysts were prepared by sol-gel method. The influence of different amounts of noble metals (1–5 mol-%) present on the microstructure as well as the photocatalytic property under 4-chlorophenol degradation was evaluated. The anatase phase was favored at low Pt content; however, the apparition of new phases after 3 mol-% (PtO) suggests a saturation lattice considering our solubility limit at 1 mol-%. Similar trend was observed when Pd was added to the TiO2lattice. The as-prepared catalysts were deeply characterized by X-ray diffraction (XRD) with the Rietveld Method, Raman spectroscopy, high resolution scanning electron microscopy (HRSEM), scanning transmission electron microscopy (STEM), Brunauer-Emmett-Teller (BET) adsorption analysis, and X-Ray photoelectron spectroscopy (XPS). Unit-cell parameter of TiO2phases varied from 30 to 93 vol-% depending on the amount of Pt or Pd added to the composite. HRTEM and HRSEM identified the phases in the catalysts and confirmed the nanometric size and morphology of the catalysts. An improvement in removal efficiency of 4-chlorophenol was obtained in all the specimens compared with the commercial Degussa P25, which can be explained in terms of phase composition and modification of the band gap.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Influence of Phases Content on Pt/TiO₂, Pd/TiO₂Catalysts for Degradation of 4-Chlorophenol at Room Temperature

Garc

a-Zaleta

Torres‐Huerta

et al. 2016

Journal of Nanomaterials

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“…Nonmetal elements with high ionization energies and high electronegativity, such as nitrogen (N) [52][53][54], carbon (C) [55,56], boron (B) [57][58][59], sulfur (S) [60,61], fluorine (F) [62][63][64], and chlorine (Cl) [65,66], are an efficient strategy to enhance the visible light photocatalytic activity, which results in higher photocatalytic activity in the visible light region owing to the bandgap narrowing and the shift of absorption edge.…”

Section: Nonmetal Dopingmentioning

confidence: 99%

Influences of Doping on Photocatalytic Properties of TiO2 Photocatalyst

Huang¹,

Yan²,

Zhao³

2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

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As a kind of highly effective, low-cost, and stable photocatalysts, TiO 2 has received substantial public and scientific attention. However, it can only be activated under ultraviolet light irradiation due to its wide bandgap, high recombination, and weak separation efficiency of carriers. Doping is an effective method to extend the light absorption to the visible light region. In this chapter, we will address the importance of doping, different doping modes, preparation method, and photocatalytic mechanism in TiO 2 photocatalysts. Thereafter, we will concentrate on Ti 3+ self-doping, nonmetal doping, metal doping, and codoping. Examples of progress can be given for each one of these four doping modes. The influencing factors of preparation method and doping modes on photocatalytic performance (spectrum response, carrier transport, interfacial electron transfer reaction, surface active sites, etc.) are summed up. The main objective is to study the photocatalytic processes, to elucidate the mechanistic models for a better understanding the photocatalytic reactions, and to find a method of enhancing photocatalytic activities.

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“…For all the NPs rutile peak E g (1), which tends to broaden and blue shift the peak position starting from 245 cm − 1 , partially, with N/O ratio decrease (denoted by the arrow) may be seen. A controversial tendency may be also seen for the rutile peak E g (2) (445 cm − 1 ): redshift and transformation into the peak at 422 cm − 1 [54]. The broadening arises mainly owing to the oxygen vacancies and due to phonon confinement effects in the NPs [44].…”

Section: Raman Spectroscopymentioning

confidence: 99%

Some peculiarities of room-temperature ferromagnetism in ensembles of mixed-phase TiNx-TiOy nanoparticles

Morozov

Белоусова

Sathasivam

et al. 2021

Materials Research Bulletin

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Mixed-phase TiN x -TiO y nanoparticles with an average particlesize of 27-120 nm were prepared by the levitationjet generator through condensation of Ti metal vapor in inert gas flow with gaseous nitrogen/air additive. The nanoparticles were characterized by Scanning electron microscopy, X-ray diffraction, Ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, and Vibrating sample magnetometry. Room-temperature ferromagnetism with a maximum magnetization of up to 0.14 emu/g was discovered in the nanoparticles. The observed ferromagnetic ordering was related to the defect Ti-N-O structures at the interfaces between crystal phases. This suggestion is in good correlation with data obtained during spectroscopic studies. All the results demonstrate that the predominant role of the nitrogen and oxygen vacancies at the interfaces between titanium nitride, anatase, rutile, as well as the other mixed Ti-N-O phases contribute to the evolution of the room-temperature ferromagnetism. The maximum saturation magnetization of nanoparticles was extremely dependent on the N/O ratio, and area of peaks core-levels N 1s and O 1s. For the first time, an unknown phenomenonof a temporary "turn-off" effect of magnetization in hysteresis loops of some mixed-phase nanoparticles was discovered. The obtained results could be used in the search for new spintronic materials.

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Morphology and structural development of reduced anatase-TiO2 by pure Ti powder upon annealing and nitridation: Synthesis of TiOx and TiOxNy powders

Cited by 27 publications

References 23 publications

Influence of Phases Content on Pt/TiO₂, Pd/TiO₂Catalysts for Degradation of 4-Chlorophenol at Room Temperature

Influence of Phases Content on Pt/TiO₂, Pd/TiO₂Catalysts for Degradation of 4-Chlorophenol at Room Temperature

Influences of Doping on Photocatalytic Properties of TiO2 Photocatalyst

Some peculiarities of room-temperature ferromagnetism in ensembles of mixed-phase TiNx-TiOy nanoparticles

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Morphology and structural development of reduced anatase-TiO2 by pure Ti powder upon annealing and nitridation: Synthesis of TiOx and TiOxNy powders

Cited by 27 publications

References 23 publications

Influence of Phases Content on Pt/TiO2, Pd/TiO2Catalysts for Degradation of 4-Chlorophenol at Room Temperature

Influence of Phases Content on Pt/TiO2, Pd/TiO2Catalysts for Degradation of 4-Chlorophenol at Room Temperature

Influences of Doping on Photocatalytic Properties of TiO2 Photocatalyst

Some peculiarities of room-temperature ferromagnetism in ensembles of mixed-phase TiNx-TiOy nanoparticles

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Product

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Influence of Phases Content on Pt/TiO₂, Pd/TiO₂Catalysts for Degradation of 4-Chlorophenol at Room Temperature

Influence of Phases Content on Pt/TiO₂, Pd/TiO₂Catalysts for Degradation of 4-Chlorophenol at Room Temperature