Rapid Formation of 1D Titanate Nanotubes Using Alkaline Hydrothermal Treatment and Its Photocatalytic Performance

Lai, Chin Wei; Hamid, Sharifah Bee Abd; Tan, Tong Ling; Lee, Wai Hong

doi:10.1155/2015/145360

Cited by 9 publications

(7 citation statements)

References 26 publications

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“…According to the most acceptable model, TiO 2 reacts with concentrated NaOH and Na 2 Ti 3 O 7 is formed. During washing with HCl and distilled water, ion exchange occurs between H + and Na + and H 2 Ti 3 O 7 is formed. , The tiny amount of Na originated in the EDS spectrum is due to the presence of unreacted Na 2 Ti 3 O 7 . CASINO (monte CArlo SImulation of electroN trajectory in sOlids) simulation has been performed to determine the electron-hydrogen titanate interactions .…”

Section: Resultsmentioning

confidence: 99%

“…A sodium peak is observed around 1.04 keV and an oxygen peak is observed around 0.5 keV along with titanium. 22,23 The tiny amount of Na originated in the EDS spectrum is due to the presence of unreacted Na 2 Ti 3 O 7 . CASINO (monte CArlo SImulation of electroN trajectory in sOlids) simulation has been performed to determine the electron-hydrogen titanate interactions.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Electron Beam Modulated Wettability and Electrical Conductivity of Hydrogen Titanate Nanowires

2021

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The effect of electron irradiation on the chemical and physical properties of surfaces is an extremely crucial field of study in the context of space exploration, radiation chemistry, and physics. For instance, long-term ion and electron irradiations in planetary or satellite surfaces lead to a significant change in surface and environmental compositions. In this work the modification of hydrogen titanate nanowires using low energy electrons has been studied. The nanowires are initially strongly hydrophilic, which changes to hydrophobic after electron irradiation. The electrical conductivity of the nanowires increases systematically with irradiation dose. We have invoked first-principles-based calculations to explain the observed results. The calculation shows that the removal of OH groups from the layered structure due to irradiation influences the wetting property. Furthermore, the irradiation-induced defects lead to an empty Ti d-shell near the Fermi level, which contributes toward the modification of electrical conductivity. The theoretical predictions are also corroborated with Xray diffraction, X-ray electron spectroscopic, and Raman scattering spectroscopic studies, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Electron Beam Modulated Wettability and Electrical Conductivity of Hydrogen Titanate Nanowires

2021

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“…Two signals corresponding to Na 2 Ti 3 O 7 at 24.3° and 28.2° (2θ) and two small peaks at 48.3° and 62.7° (2θ) can be attributed to H 2 Ti 3 O 7 according to the PDF cards 031–1329 and 047–0561, respectively. These peaks were broad and low in intensityand commonly appear during hydrothermal alkaline synthesis due to the presence of high sodium concentrations 19 . After calcination, the signals attributed to the titanates were not detected in the corresponding diffractograms of TiO 2 ‐HT and Ni‐TiO 2 ‐HT.…”

Section: Resultsmentioning

confidence: 99%

Titanium dioxide nanostructures doped with nickel and its performance in photocatalytic reduction of 4‐nitrophenol

Lemus

Rodríguez

García‐Mendoza

et al. 2023

J of Chemical Tech & Biotech

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Background: In this work, we investigated the effect of nickel on the photocatalytic properties of TiO 2 nanostructures. The photocatalysts were obtained in a two-stage procedure. First, the sol-gel method was used for obtaining TiO 2 and Ni-TiO 2 at 1.0 wt% of Ni, which was then followed by hydrothermal treatment under highly alkaline conditions with NaOH at 110°C.Results: The obtained powders were thermally treated at 400°C. The main crystalline phase was anatase for all the samples, and a lower E g value was estimated for the Ni/TiO 2 sample (3.13 eV). The specific BET areas were obtained from N 2 isotherms at 77 K, being 141 and 153 m 2 /g for pure TiO 2 and 1.0% Ni-TiO 2 samples, respectively. Scanning electron microscopy confirmed the rod shape of the particles with diameters between 10 and 20 nm and length between 100 and 400 nm. X-ray photoelectron spectroscopy analysis showed the presence of oxygen vacancies and surface hydroxyl oxygen species in all samples, but in a higher ratio for the Ni/TiO 2 -HT-400 sample. The photocatalytic test was performed using two different radiation sources: 254 nm and a simulated solar lamp (300 W), for the photoreduction of 4-nitrophenol to 4-aminophenol, which was followed by UV-vis spectroscopy.Conclusions: The Ni/TiO 2 -HT-400 sample showed a high efficiency, reaching 100% reduction after 15 min (simulated solar radiation) and 40 min (⊗ = 254 nm) after the first cycle, while for the second cycle these values decreased to 63% and 78%, respectively. The increase in the photocatalytic reduction of TiO 2 nanostructures was achieved mainly through the presence of oxygen vacancies along with the decrease in electron-hole recombination.

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“…In general, there are two reaction steps in sequence during the hydrothermal process, (i) formation of layered titanate and (ii) dissolution followed by re-crystallisation along with the ion exchange. The chemical reactions are suggested below (Gao et al, 2013;Lai et al, 2015):…”

Section: Resultsmentioning

confidence: 99%

Enhanced adsorption property of TiO2 based nanoribbons produced by alkaline hydrothermal process

Ariyanti

Mo'ungatonga

Gao

2020

METANA

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TiO2 is a semiconductor material with endless potential for the development of renewable energy as well as in the environmental field application. With various methods, TiO2 nanostructures with various morphology, properties and application can be developed. In this paper, the synthesis of TiO2 based nanoribbons with high adsorption property produced by alkaline hydrothermal methods were investigated. Its morphology, crystal structure and physical properties were characterized using Scanning Electron Microscope (SEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) and Brunauer-Emmett-Teller (BET) surface area analysis. The result shows that by controlling the hydrothermal processing time, different morphology and structures of TiO2 nanoribbons with different adsorption properties can be obtained. The nanoribbons produced via alkaline hydrothermal method has width 200-300 nm and length up to several microns. It also possesses fair adsorption capacity over dyes (Rhodamine B and Methyl orange) considering its large surface area and high pore volume.

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Rapid Formation of 1D Titanate Nanotubes Using Alkaline Hydrothermal Treatment and Its Photocatalytic Performance

Cited by 9 publications

References 26 publications

Electron Beam Modulated Wettability and Electrical Conductivity of Hydrogen Titanate Nanowires

Electron Beam Modulated Wettability and Electrical Conductivity of Hydrogen Titanate Nanowires

Titanium dioxide nanostructures doped with nickel and its performance in photocatalytic reduction of 4‐nitrophenol

Enhanced adsorption property of TiO2 based nanoribbons produced by alkaline hydrothermal process

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