Formation of Ti(III) and Ti(IV) states in Ti3O5 nano- and microfibers obtained from hydrothermal annealing of C-doped TiO2 on Si

Stem, N.; Souza, Maria Eliza Jordani de; Faria, Dalva Lúcia Araújo de; Filho, Sebastião Gomes dos Santos

doi:10.1016/j.tsf.2014.02.077

Cited by 19 publications

(10 citation statements)

References 49 publications

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“…Quantitatively, 67.3% were due to Ti 4+ believed to be arising from the reaction of the surface (Ti 3+ ) states of the Ti 3 O 5 nanoparticles with water during hydrothermal synthesis. It was seen that the (Ti 3+ /Ti 4+ ) ratio was (1:10) which was much lower than the expected value for a Ti 3 O 5 phase (2:1) [34]. This implied that the amount of Ti 3 O 5 formed during hydrothermal synthesis was very low (and, therefore, could not be detected in the XRD pattern).…”

Section: Ftir Analysismentioning

confidence: 82%

Effect of calcination atmosphere on structural, optical and photocatalytic activity of TiO2/SnS2 core-shell nanostructures in the reduction of aqueous Cr(VI) to Cr(III)

Sikdar

Thomas

Ramachandra

et al. 2021

PAC

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Conversion of Cr(VI) to Cr(III) in mitigating pollution of water bodies is of significant importance to public health due to the fact that Cr(VI) is known to be a potent carcinogen, while Cr(III) is relatively low in toxicity. Photocatalytic approaches are considered as important means to achieve this reduction. Here, TiO2/SnS2 core-shell nanostructures have been produced using a single-step hydrothermal method and its photocatalytic activity is tested for the reduction of aqueous Cr(VI). The structural and optical properties of the as-synthesized products are characterized by XRD, HRTEM, Raman, FTIR, XPS and DRS techniques. The present work reveals that by calcining the core-shell nanoparticles in Ar atmosphere a defective Ti3O5 phase is formed as the core with low band gap, and hence, offers improved light absorption in the visible range. However, its photoactivity was found to be lower than that of the core-shell nanoparticles annealed in oxidizing atmosphere. The observed lower photoreduction was due to the presence of midgap states which acted as recombination centres and hence, reduced the photocatalytic activity.

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Section: Ftir Analysismentioning

confidence: 82%

Effect of calcination atmosphere on structural, optical and photocatalytic activity of TiO2/SnS2 core-shell nanostructures in the reduction of aqueous Cr(VI) to Cr(III)

Sikdar

Thomas

Ramachandra

et al. 2021

PAC

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“…Under irradiation, the electron-hole pairs are photogenerated on the anatase surface (Equation ( 2)). The oxidative holes (h+) VB can react with H 2 O to form active species OH•, react with hydroxide ions on the surface (Si-OH) or can directly react with the dye molecules producing degradation product (Equations (3)-( 5)) [42]. The dye molecules (R-H) are degraded by the hydroxyl radicals to organic intermediates, smaller organic molecules or inorganic compounds, such as CO 2 and H 2 O or to others (Equation ( 6)).…”

Section: The Tandem Adsorption and Photocatalysis Processesmentioning

confidence: 99%

“…The degradation mechanisms are very different; the azo group, with labile π-bonds, is the first target for •HO• in the case of BR (azo-dye). The sulfonic groups also react to further produce phenol or other aromatic compounds [42,43], and the amino groups eventually form ammonia [44]. In BB dye, the HO• radicals attack the -NH-positions and sulfonic groups leading to a broad range of intermediates derived from the anthraquinone nuclei [40,47,48].…”

Section: The Effect Of Concentration Of the H 2 O 2 On The Photocatalmentioning

confidence: 99%

Fly Ash Waste Recycling by Pt/TiO2 Incorporation for Industrial Dye Removal

Vişa

Cosnita

Moldovan

et al. 2021

IJERPH

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New materials are obtained by transforming fly ash wastes into a valuable composite, with tandem adsorption and photodegradation properties. Mild hydrothermal synthesis, from titanium dioxide, platinum nanoparticles and zeolite materials obtained from a waste, fly ash, as support, was involved in the composite preparation. The platinum nanoparticles extended the photocatalytic activity of the composite in visible range (Eg = 2.1 eV). The efficiency of tandem adsorption and photocatalytic activity of the new composite were determined to be 25% for Bemacid Blau and 43.89% for Bemacid Rot after 360 min, the irradiation time. The addition of H2O2 improves the process efficiency up to 80.70% and 93.43%, respectively. The Pt nanoparticle (PtNP) contribution led to the band gap energy change to Vis light (400 nm), thus suggesting the possibility of photocatalysis under the action of a fraction of natural light.

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“…The oxidative holes (h+)VB can react with H2O to form active species OH•or will react with hydroxyd ions on the surface (Si -OH) or can directly react with the dyes molecules producing degradation product, Eqs. (3 -5) [35]. The dye molecules (R-H) will be degradate by the hydroxyl radicals to organic intermediates, smaller organic molecules or inorganic compounds, such as CO2, H2O or to other, Eq.(6).…”

Section: The Combined Adsorption and Photocatalysis Processesmentioning

confidence: 99%

“…The degradation mechanisms are very different, the azo group, with labile π-bonds, is the first target for•HO•, in the case of BR (azo-dye). The sulfonic groups will also react to further produce phenol or other aromatic compounds [35,36], and the amino-groups will eventually form ammonia [37]. In BB dye, the HO• radicals attack the -NH-positions and sulfonic groups leading to a broad range of intermediates derived from the anthraquinone nuclei [34,40,41].…”

Section: H2o2 → H2o + O2 (11)mentioning

confidence: 99%

Fly Ash Waste Recycling by Pt/TiO<sub>2</sub> Incorporation for Industrial Dyes Removal

Vişa¹,

Cosnita²,

Moldovan³

et al. 2021

Preprint

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New materials are obtained by transforming fly ash wastes into a valuable composite, with tandem adsorption and photodegradation properties. Mild hydrothermal synthesis, from titanium dioxide, Platinum nanoparticles and zeolite materials obtained from a waste, fly ash, as support, was involved in the composite preparation. The Platinum nanoparticles extended the photocatalytic activity of the composite in Visible range (Eg = 2.1 eV). The efficiency of tandem adsorption and photocatalytic activity of the new composite were evaluated to 80.70% for Bemacid Blau and 93.89% for Bemacid Rot, after 360 min, the irradiation time, with H2O2 addition.

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Formation of Ti(III) and Ti(IV) states in Ti3O5 nano- and microfibers obtained from hydrothermal annealing of C-doped TiO2 on Si

Cited by 19 publications

References 49 publications

Effect of calcination atmosphere on structural, optical and photocatalytic activity of TiO2/SnS2 core-shell nanostructures in the reduction of aqueous Cr(VI) to Cr(III)

Effect of calcination atmosphere on structural, optical and photocatalytic activity of TiO2/SnS2 core-shell nanostructures in the reduction of aqueous Cr(VI) to Cr(III)

Fly Ash Waste Recycling by Pt/TiO2 Incorporation for Industrial Dye Removal

Fly Ash Waste Recycling by Pt/TiO<sub>2</sub> Incorporation for Industrial Dyes Removal

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