Study of the growth of CeO2 nanoparticles onto titanate nanotubes

Marques, Thalles M.F.; Ferreira, Odair P.; Costa, J.A.P. da; Fujisawa, Kazunori; Terrones, Mauricio; Viana, Bartolomeu C.

doi:10.1016/j.jpcs.2015.08.022

Cited by 34 publications

(20 citation statements)

References 50 publications

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“…To the best of our knowledge, theoretical calculations regarding the vibrational modes of the titanate nanotubes have not yet been reported. However, comparison of the Raman spectra of the synthesized samples with those reported in the literature show that the set of the observed bands agree well with that of Na 2 Ti 3 O 7 28,32,34. …”

supporting

confidence: 79%

“…1 . 12,28 This can be clearly seen in the diffractogram of the Co ion exchange TNT/Co(5%) sample, for which the above mentioned peak shifts from 2θ = 10.22° to 8.74°, as a result of the incorporation of cobalt via Na/Co ion exchange between the TiO 6 sheets. It should be noted that the observed decrease of the 2θ position implies an increase of the interlayers' distance, which is expected since the ionic radius of the Na + is smaller than that of hydrated Co 2+ .…”

Section: Structural and Morphological Characterizationmentioning

confidence: 81%

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The effect of ionic Co presence on the structural, optical and photocatalytic properties of modified cobalt–titanate nanotubes

Barrocas

Silvestre

Rolo

et al. 2016

Phys. Chem. Chem. Phys.

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With the aim of producing materials with enhanced optical and photocatalytic properties, titanate nanotubes (TNTs) modified by cobalt doping (Co-TNT) and by Na(+)→ Co ion-exchange (TNT/Co) were successfully prepared by a hydrothermal method. The influence of the doping level and of the cobalt position in the TNT crystalline structure was studied. Although no perceptible influence of the cobalt ion position on the morphology of the prepared titanate nanotubes was observed, the optical behaviour of the cobalt modified samples is clearly dependent on the cobalt ions either substituting the Ti(4+) ions in the TiO6 octahedra building blocks of the TNT structure (doped samples) or replacing the Na(+) ions between the TiO6 interlayers (ion-exchange samples). The catalytic ability of these materials on pollutant photodegradation was investigated. First, the evaluation of hydroxyl radical formation using the terephthalic acid as a probe was performed. Afterwards, phenol, naphthol yellow S and brilliant green were used as model pollutants. Anticipating real world situations, photocatalytic experiments were performed using solutions combining these pollutants. The results show that the Co modified TNT materials (Co-TNT and TNT/Co) are good catalysts, the photocatalytic performance being dependent on the Co/Ti ratio and on the structural metal location. The Co(1%)-TNT doped sample was the best photocatalyst for all the degradation processes studied.

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supporting

confidence: 79%

Section: Structural and Morphological Characterizationmentioning

confidence: 81%

The effect of ionic Co presence on the structural, optical and photocatalytic properties of modified cobalt–titanate nanotubes

Barrocas

Silvestre

Rolo

et al. 2016

Phys. Chem. Chem. Phys.

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“…Above a critical concentration of cerium ion in the aqueous solution, the decoration of the outer nanotube surfaces with CeO 2 nanoparticles takes place via hydrolysis reaction in the aqueous solutions and the attachment of the nanoparticles [267]. It was shown that the ion exchange reaction preserved the atomic Fig.…”

Section: Metal Nanoparticles On Titanate Nanostructuresmentioning

confidence: 99%

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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“…1a. According to previous studies (Ferreira et al 2006(Ferreira et al , marques et al 2015, the vibrational modes centered at around 164 and 195 cm -1 are attributed to the lattice modes (Na + -O-Ti); modes centered at 275, 448 and 662 and 700 cm -1 correspond to Ti-O-Ti stretching from the edge-sharing TiO 6 octahedron and the mode at 906 cm -1 represent the stretching of unshared Ti-O bonds in the units of distorted TiO 6 of NaTiNts (Viana et al 2011). In the hTiNts spectrum, it was observed that the highest (906 cm -1 ) and the lowest (145 and 195 cm -1 ) energy modes have their wave numbers and intensities widely affected by the proton ion.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen production from aqueous glycerol using titanate nanotubes decorated with Au nanoparticles as photocatalysts

Marques

Morais

Nobre

et al. 2019

An. Acad. Bras. Ciênc.

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Protonated titanate nanotubes (hTiNts) were synthesized using the hydrothermal method, followed by proton exchange with acid. Gold nanoparticles decorated titanate nanotubes (AuhTiNts) were obtained by the reduction of AuCl 4 under vigorous stirring with an aqueous solution of hTiNts containing 1 wt% of ascorbic acid. To investigate the surface structural chemistry of the titanate and AuhTiNts, the following characterization methods were used: scanning and transmission electron microscopy, X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, Raman spectroscopy and X-ray photo-electron spectroscopy. The mean internal and external diameters for titanate nanotubes were found to be 5.46 ± 0.08 nm and 8.42 ± 0.03 nm, respectively, whereas the mean diameter of gold nanoparticles was measured to be 9.68 nm ± 0.03 nm. The as-synthesized AuhTiNts was used as photocatalyst in hydrogen production from glycerol as a sacrificial agent. The enhancement in the production of hydrogen, using the heterogeneous AuhTiNts catalysts, can be attributed to the intrinsic catalytic potential of gold as well as its interactions with titanate nanostructure.

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Study of the growth of CeO2 nanoparticles onto titanate nanotubes

Cited by 34 publications

References 50 publications

The effect of ionic Co presence on the structural, optical and photocatalytic properties of modified cobalt–titanate nanotubes

The effect of ionic Co presence on the structural, optical and photocatalytic properties of modified cobalt–titanate nanotubes

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

Hydrogen production from aqueous glycerol using titanate nanotubes decorated with Au nanoparticles as photocatalysts

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