Studies on Fe-modified nanostructured trititanates

Morgado, E.; Marinković, Bojan A.; Jardim, P.M.; Abreu, Marco A.S. de; Rocha, Maria da Graça Carneiro da; Bargiela, Pascal

doi:10.1016/j.matchemphys.2010.11.054

Cited by 24 publications

(15 citation statements)

References 43 publications

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“…XRD profile of the 15 at.% MnH-NT compared to the undoped, protonated sample (H 2 Ti 3 O 7 ) shows the weakening of the peak near 2θ= 10 • upon the ion-exchange. Similar weakening of this characteristic reflection was found by several authors [20][21][22]. This could be related to the distortion of crystalline order within the layers due to ion-exchange.…”

Section: Resultssupporting

confidence: 87%

Synthesis of Homogeneous Manganese-Doped Titanium Oxide Nanotubes from Titanate Precursors

et al. 2012

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We report a novel synthesis route of homogeneously manganese-doped TiO2 nanotubes in a broad concentration range. The scroll-type trititanate (H2Ti3O7) nanotubes prepared by hydrothermal synthesis were used as precursors. Mn 2+ ions were introduced by an ion exchange method resulting MnxH2−xTi3O7. In a subsequent heat-treatment they were transformed into MnyTi1−yO2 where y = x/(3 + x). The state and the local environment of the Mn 2+ ions in the precursor and final products were studied by Electron Spin Resonance (ESR) technique. It was found that the Mn 2+ ions occupy two positions: the first having an almost perfect cubic symmetry while the other is in a strongly distorted octahedral site. The ratio of the two Mn 2+ sites is independent of the doping level and amounts to 15:85 in MnxH2−xTi3O7 and to 5:95 in MnyTi1−yO2. SQUID magnetometry does not show long-range magnetic order in the homogeneously Mn 2+ -doped nanotubes.

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Section: Resultssupporting

confidence: 87%

Synthesis of Homogeneous Manganese-Doped Titanium Oxide Nanotubes from Titanate Precursors

et al. 2012

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“…The promotor effect of WO 3 was not observable on V5-W3/ TAN: it offered NO conversion very similar to that of V10/ TAN. Morgado studied iron-exchanged titanate nanotubes synthesized by mixing Na-form titanate nanotubes in aqeuous Fe (NO 3 ) 3 solutions of different concentration, aiming at obtaining 2, 5, 10, 15 and 30 wt% iron loading [258]. TEM and XRD confirmed that the structure and morphology of the nanotubes remained largely intact.…”

Section: Effect Of Ion Exchange On the Surface Properties Of Titanatementioning

confidence: 96%

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Kukovecz

Kordás

Kiss

2016

Surface Science Reports

102

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Titanates are salts of polytitanic acid that can be synthesized as nanostructures in a great variety concerning crystallinity, morphology, size, metal content and surface chemistry.Titanate nanotubes (open-ended hollow cylinders measuring up to 200 nm in length and 15 nm in outer diameter) and nanowires (solid, elongated rectangular blocks with length up to 1500 nm and 30-60 nm diameter) are the most widespread representatives of the titanate nanomaterial family. This review covers the properties and applications of these two materials from the surface science point of view. Dielectric, vibrational, electron and X-ray spectroscopic results are comprehensively discussed first, then surface modification methods including covalent functionalization, ion exchange and metal loading are covered. The versatile surface chemistry of onedimensional titanates renders them excellent candidates for heterogeneous catalytic, photocatalytic, photovoltaic and energy storage applications, therefore, these fields are also reviewed.

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“…Moreover, following the above mentioned 2θ shift to higher values, a broadening of this peak was also observed when the reference pH decreases. These structural features are related with different sodium contents in the samples [19,20], and are indicative of a Na + → H + substitution process in the interlayer region. Moreover, the decrease of the Na 2 Ti 3 O 7 peak intensity (e.g.…”

Section: Identification and Morphologymentioning

confidence: 99%

Influence of the sodium/proton replacement on the structural, morphological and photocatalytic properties of titanate nanotubes

Bem

Neves

Nunes

et al. 2012

Journal of Photochemistry and Photobiology A: Chemistry

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Titanate nanotubes (TNT) with different sodium contents have been synthesised using a hydrothermal approach and a swift and highly controllable post-washing processes. The influence of the sodium/proton replacement on the structural and morphological characteristics of the prepared materials was analysed. Different optical behaviour was observed depending on the Na + /H + samples' content. A band gap energy of 3.27±0.03 eV was estimated for the material with higher sodium content while a value of 2.81±0.02 eV was inferred for the most protonated material, which therefore exhibits an absorption edge in the near visible region. The point of zero charge of the materials was determined and the influence of the sodium content on the adsorption of both cationic and anionic organic dyes was studied. The photocatalytic performance of the TNT samples was evaluated in the rhodamine 6G degradation process. Best photodegradation results were obtained when using the most protonated material as catalyst, although this material has shown the lowest R6G adsorption capability.

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Studies on Fe-modified nanostructured trititanates

Cited by 24 publications

References 43 publications

Synthesis of Homogeneous Manganese-Doped Titanium Oxide Nanotubes from Titanate Precursors

Synthesis of Homogeneous Manganese-Doped Titanium Oxide Nanotubes from Titanate Precursors

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Influence of the sodium/proton replacement on the structural, morphological and photocatalytic properties of titanate nanotubes

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