Sonosynthesis of nanostructured TiO2 doped with transition metals having variable bandgap

Savio, A.K.P.D.; Fletcher, J.C.Q.; Hernández, Francisco C. Robles

doi:10.1016/j.ceramint.2012.09.042

Cited by 41 publications

(22 citation statements)

References 48 publications

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“…Thus, the values obtained here are consistent with those reported for Ti(IV). Also, the energy difference between the BE of Ti 2p 3/2 and Ti 2p 1/2 was around 5.7–5.8 eV, which is also consistent with values reported in the literature for Ti(IV) [26]. The FWHM of the Ti 2p 3/2 peak (0.98 eV) is quite consistent with this assignment [27].…”

Section: Resultssupporting

confidence: 90%

Tm-doped TiO₂ and Tm₂Ti₂O₇ pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase

Santos¹,

Navas²,

Aguilar³

et al. 2015

Beilstein J. Nanotechnol.

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SummaryTm-doped TiO2 nanoparticles were synthesized using a water-controlled hydrolysis reaction. Analysis was performed in order to determine the influence of the dopant concentration and annealing temperature on the phase, crystallinity, and electronic and optical properties of the resulting material. Various characterization techniques were utilized such as X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy and UV–vis spectroscopy. For the samples annealed at 773 and 973 K, anatase phase TiO2 was obtained, predominantly internally doped with Tm3+. ICP–AES showed that a doping concentration of up to 5.8 atom % was obtained without reducing the crystallinity of the samples. The presence of Tm3+ was confirmed by X-ray photoelectron spectroscopy and UV–vis spectroscopy: the incorporation of Tm3+ was confirmed by the generation of new absorption bands that could be assigned to Tm3+ transitions. Furthermore, when the samples were annealed at 1173 K, a pyrochlore phase (Tm2Ti2O7) mixed with TiO2 was obtained with a predominant rutile phase. The photodegradation of methylene blue showed that this pyrochlore phase enhanced the photocatalytic activity of the rutile phase.

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Section: Resultssupporting

confidence: 90%

Tm-doped TiO₂ and Tm₂Ti₂O₇ pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase

Santos¹,

Navas²,

Aguilar³

et al. 2015

Beilstein J. Nanotechnol.

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show abstract

“…Thus, the values obtained for our doped samples are consistent with those in the literature for Ti(IV). In addition, doublet splitting for Ti 2p was around 5.7e5.8 eV, which is also in line with values reported in the literature for Ti (IV) [48]. The FWHM (¼ 0.98 eV in the spectra obtained) of the peak of Ti 2p 3/2 is fairly consistent with the assignation of the oxidation state þ4 to Ti [49].…”

Section: Xpssupporting

confidence: 89%

Study of thulium doping effect and enhancement of photocatalytic activity of rutile TiO2 nanoparticles

Santos

Navas

Aguilar

et al. 2015

Materials Chemistry and Physics

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“…Pure TiO 2 shows two peaks located at binding energies (BE) of 458.7 eV and 464.4 eV corresponding to Ti 2p 3/2 and Ti 2p 1/2 states of stoichiometric TiO 2 , respectively, which is consistent with the values of Ti 4 + in TiO 2 lattice reported in the literature.The typical value reported for Ti(IV) is 458.66 eV, while for Ti(III), Ti(II) and Ti(0) they are 457.13 eV, 455.34 and 453.86 eV[64]. In turn, the distance between the BE of Ti 2p 3/2 and Ti 2p 1/2 was around 5.71 eV, which is consistent with previous results for Ti(IV)[65].For the 5.5% MoS2/TiO 2 samples annealed at 500 °C and 700 °C, the binding energies of Ti 2p 3/2 and Ti 2p 1/2 were 459.18-459.93 eV and 464.93 eV, respectively, which are consistent with the presence of Ti 4+ in the TiO 2 .…”

supporting

confidence: 90%

Easy Synthesis Method of MoS2/TiO2 Nanostructure with Great Performance of Catalytic Activity Under Visible Light

2019

IJNN

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In this study, TiO2 nanoparticles modified with MoS2 were synthesized using the low temperature hydrolysis method. Samples of pure TiO2 and samples of MoS2 /TiO2 were prepared using different amounts of MoS2 (1.0% and 10.0% by weight). The samples were annealed at 500°C and 700°C and characterised by ICP-AES, XRD, Raman, FT-IR, TG, XPS and DR-UV-Vis spectroscopy. The results suggest that the MoS2 added during synthesis is a satisfactory source of Mo to produce doping of the TiO2 structure. In addition, the transformation of anatase phase to rutile is delayed when the concentration of Mo incorporated into the structure increases. Finally, the effectiveness of the synthesized MoS2 /TiO2 samplesused as photocatalyst for the photodegradation of methylene blue dye under visible light irradiation was investigated. TiO2 doped with MoS2 was shown to improve the degradation of methylene blue under visible light. There was found to be an optimal temperature and level of doping to achieve improved photocatalytic activity, in our case 10.0% MoS2 /TiO2 at 700°C.

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Sonosynthesis of nanostructured TiO2 doped with transition metals having variable bandgap

Cited by 41 publications

References 48 publications

Tm-doped TiO₂ and Tm₂Ti₂O₇ pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase

Tm-doped TiO₂ and Tm₂Ti₂O₇ pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase

Study of thulium doping effect and enhancement of photocatalytic activity of rutile TiO2 nanoparticles

Easy Synthesis Method of MoS2/TiO2 Nanostructure with Great Performance of Catalytic Activity Under Visible Light

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Sonosynthesis of nanostructured TiO2 doped with transition metals having variable bandgap

Cited by 41 publications

References 48 publications

Tm-doped TiO2 and Tm2Ti2O7 pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase

Tm-doped TiO2 and Tm2Ti2O7 pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase

Study of thulium doping effect and enhancement of photocatalytic activity of rutile TiO2 nanoparticles

Easy Synthesis Method of MoS2/TiO2 Nanostructure with Great Performance of Catalytic Activity Under Visible Light

Contact Info

Product

Resources

About

Tm-doped TiO₂ and Tm₂Ti₂O₇ pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase

Tm-doped TiO₂ and Tm₂Ti₂O₇ pyrochlore nanoparticles: enhancing the photocatalytic activity of rutile with a pyrochlore phase