Characterization and application of niobium-doped titanium dioxide thin films prepared by sol–gel process

Gomes, Gustavo H.M.; Jesus, Magnum Augusto Moraes Lopes de; Ferlauto, André S.; Viana, Marcelo Machado; Mohallem, Nelcy Della Santina

doi:10.1007/s00339-021-04781-6

Cited by 6 publications

(3 citation statements)

References 41 publications

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“…MB dye exhibits 68% degradation for 1% Nb-doped TiO 2 , while the degradation rate reaches a maximum of about 96% with 3% Nb-doped TiO 2 . Therefore, the degradation performance of 3% Nb-doped TiO 2 exceeds previously reported results [30,31,[52][53][54][55][56]. The improved removal rate of MB dye in 3% Nb -doped TiO 2 occurs from the low value of the band gap, smaller crystalline size and sufficient extent of surface defects/oxygen vacancies on sheet-like morphology.…”

Section: Photocatalytic Activitymentioning

confidence: 59%

Hydrothermally synthesized Nb -doped TiO₂ nanosheets for efficient removal of methylene blue dye on photocatalytic performance

Alhashmialameer,

Shariq,

Althikrallah

et al. 2024

Phys. Scr.

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In this work, Niobium-doped (1%, 3%, and 5%) titanium dioxide (Nb-TiO2) nanosheets were successfully formed via the hydrothermal route and further characterized using TEM, XRD, XPS and UV–vis absorption spectroscopy techniques. Phase purity and structural information of the prepared materials were analysed by XRD measurements. The band gap values ranged from 3.27 to 2.98 eV as Nb doping increased, leading to improved photocatalytic activity by creating new energy levels close to the conduction band. The XPS results confirm the amalgamation of Nb5+ ions into TiO2 without affecting the crystallinity, structure or orientation of the occurrence of oxygen vacancies. In 3% Nb-doped TiO2, the degradation efficiency for removing (Methylene blue) MB dye increased by ∼96% for the removal of MB dye within 70 min in comparison to pure and other doped TiO2 catalysts The better photocatalytic activity of 3% Nb-TiO2 is due to the longer time between electron–hole pairs before they recombine into one pair. Hydroxyl radicals (HO•) and superoxide radicals (O2 •−) are the primary reactive entities responsible for the deterioration of MB dye. Therefore, incorporating Nb into TiO2 nanostructures represents an auspicious material for the decomposition of hazardous and toxic pollutants in aquatic environments.

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Section: Photocatalytic Activitymentioning

confidence: 59%

Hydrothermally synthesized Nb -doped TiO₂ nanosheets for efficient removal of methylene blue dye on photocatalytic performance

Alhashmialameer,

Shariq,

Althikrallah

et al. 2024

Phys. Scr.

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“…Niobium is an n-type dopant that provides excess electrons to the TiO2 lattice, generating negative charge carriers. Both Nb 5+ (~0.64 Å) and Ti 4+ (~0.61 Å) have similar ionic radii, allowing Nb 5+ to easily substitute Ti 4+ in the TiO2 lattice [38][39][40]. Gomes et al [40] reported that the addition of Nb not only reduces the average particle size of TiO2 but also increased the overall photodegradation efficiency of MB solution up to 44%, compared to 26% for bare TiO2, due to the excess electrons provided by Nb 5+ .…”

Section: Introductionmentioning

confidence: 99%

“…Both Nb 5+ (~0.64 Å) and Ti 4+ (~0.61 Å) have similar ionic radii, allowing Nb 5+ to easily substitute Ti 4+ in the TiO2 lattice [38][39][40]. Gomes et al [40] reported that the addition of Nb not only reduces the average particle size of TiO2 but also increased the overall photodegradation efficiency of MB solution up to 44%, compared to 26% for bare TiO2, due to the excess electrons provided by Nb 5+ . Furthermore, Kou et al [39] successfully reduced the wide band gap of TiO2 from 3.1 eV to 2.9 eV through Nb doping, making it more efficient within the visible light range.…”

Section: Introductionmentioning

confidence: 99%

Designing A Visible Light Driven TiO2-Based Photocatalyst by Doping and Co-Doping with Niobium (Nb) and Boron (B)

Yeoh,

Chan,

Pung

et al. 2024

Bull. Chem. React. Eng. Catal.

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Water pollution has emerged as a significant worldwide issue, with organic pollutants being a key contributor. Titanium dioxide (TiO2) has demonstrated promising photocatalytic performance in removing organic pollutants under ultraviolet (UV) irradiation. However, the wide band gap (3.2 eV) of TiO2 results in low absorption capacity of visible light, hindering its overall efficiency in degrading organic pollutants. To address the limitation, this research aimed to synthesize visible light-driven TiO2 photocatalyst with different polymorphs (anatase and rutile) and investigate the effect of various doping combination (Nb, B and Nb,B) and concentrations (0.25, 0.50, 0.75 and 1.00 mol%) on the photodegradation efficiency towards methylene blue (MB) dye solution. Anatase phase was obtained when TiO2-based nanopowders were calcined at 400 °C, while the rutile phase was formed at 900 °C based on XRD analyses. Additionally, the morphology analyses revealed that the particle size of anatase is much smaller than that of rutile. The presence of dopants further reduced the particle size of both anatase and rutile phases. Based on UV-Vis absorbance spectra analyses, the anatase Nb,B-TiO2 with 0.50 mol% of dopant concentration exhibited the best photocatalytic performance towards MB. Moreover, the anatse phase of 0.50 mol% Nb,B-TiO2 showed the narrowest band gap of 2.74 eV compared to the TiO2 (3.4 eV), representing a reduction of 19.41 %, according to UV-Vis analyses. These outcomes suggest the potential application of anatase phase of 0.50 mol% Nb,B-TiO2 in treating organic pollutants in wastewater under visible light conditions in future. Copyright © 2024 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Development, characterization and evaluation of TiO2/Nb5+ thin films with potential for corrosion prevention of AISI 304 steel in acid medium containing chloride ions

Dias,

Santos,

Machado

et al. 2024

J Mater Sci

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Characterization and application of niobium-doped titanium dioxide thin films prepared by sol–gel process

Cited by 6 publications

References 41 publications

Hydrothermally synthesized Nb -doped TiO₂ nanosheets for efficient removal of methylene blue dye on photocatalytic performance

Hydrothermally synthesized Nb -doped TiO₂ nanosheets for efficient removal of methylene blue dye on photocatalytic performance

Designing A Visible Light Driven TiO2-Based Photocatalyst by Doping and Co-Doping with Niobium (Nb) and Boron (B)

Development, characterization and evaluation of TiO2/Nb5+ thin films with potential for corrosion prevention of AISI 304 steel in acid medium containing chloride ions

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Characterization and application of niobium-doped titanium dioxide thin films prepared by sol–gel process

Cited by 6 publications

References 41 publications

Hydrothermally synthesized Nb -doped TiO2 nanosheets for efficient removal of methylene blue dye on photocatalytic performance

Hydrothermally synthesized Nb -doped TiO2 nanosheets for efficient removal of methylene blue dye on photocatalytic performance

Designing A Visible Light Driven TiO2-Based Photocatalyst by Doping and Co-Doping with Niobium (Nb) and Boron (B)

Development, characterization and evaluation of TiO2/Nb5+ thin films with potential for corrosion prevention of AISI 304 steel in acid medium containing chloride ions

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Hydrothermally synthesized Nb -doped TiO₂ nanosheets for efficient removal of methylene blue dye on photocatalytic performance

Hydrothermally synthesized Nb -doped TiO₂ nanosheets for efficient removal of methylene blue dye on photocatalytic performance