Spectroscopic studies of interfacial structures of CeO2–TiO2 mixed oxides

Fang, Jun; Bi, Xinzhen; Si, Dejun; Jiang, Zhiquan; Huang, Weixin

doi:10.1016/j.apsusc.2007.05.013

Cited by 325 publications

(161 citation statements)

References 42 publications

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“…However, at 1000 and 1200ºC, TiO 2 rutile (JCPDS 78-1510) appears as a secondary phase which indicates the crystallization of TiO 2 at high temperatures. This behaviour has already been reported by Fang et al [28] They propose a reaction mechanism on TiO 2 :CeO 2 mixed oxides based on the formation of a Ti:CeO 2 solid solution at low temperature which presents a low crystallinity of the TiO 2 anatase and therefore, XRD pattern only displays the typical pattern of CeO 2 with a cubic fluorite structure.…”

Section: +mentioning

confidence: 79%

Sol–Gel Synthesis of Tunable Cerium Titanate Materials

et al. 2008

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Cerium titanate structures present a high technological interest because of their optical and catalytic properties. This work reports the synthesis of these materials by a sol–gel methodology that allows mixed oxides with TiIV/CeIII, TiIV/CeIV or TiIV/CeIII–CeIV species to be obtained. Crystallization of CeO2–TiO2 mixed oxides and Ce2Ti2O7 pyrochlore phase was corroborated by XRD and Raman spectroscopy. Magnetic and EPR measurements were performed in order to clarify the oxidation state of the cerium ions in the system as a result of the easy oxidation of CeIII. The firing atmosphere is crucial for the CeIII/CeIV ratio, which is responsible for the different structure, but it also affects the colouration (yellow, green, brown). This methodology offers the possibility to modulate the Ce3+/Ce4+ content and particle sizes providing more ecological coloured pigments based on rare earth elements that could be interesting materials for advanced applications in catalysis.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

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Section: +mentioning

confidence: 79%

Sol–Gel Synthesis of Tunable Cerium Titanate Materials

et al. 2008

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“…Two, or more, metal oxides can interact in principle in several ways like, for instance, the 25 formation of new compounds, the formation of solid solutions in particular compositional ranges or the simple formation of solidsolid interfaces constituting a heterojunction between two nonmiscible phases. The system involving cerium dioxide and titanium dioxide has 30 been the object of some investigations in the past essentially because the two individual oxides have so many interesting properties and consequent applications, that the exploration of mixed systems is expected to produce promising results [1][2][3][4] . Cerium dioxide is well known because of its redox properties 35 allowing easy transitions between oxidized and reduced states, depending on the external conditions.…”

Section: Introductionmentioning

confidence: 99%

The interaction of oxygen with the surface of CeO₂–TiO₂ mixed systems: an example of fully reversible surface-to-molecule electron transfer

Gionco

Giamello

Mino

et al. 2014

Phys. Chem. Chem. Phys.

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Mixed CeO 2 -TiO 2 systems have been synthesized using the sol-gel technique in a symmetric range of 5 nominal compositions (0.1, 0.5, 0.9 CeO 2 molar fraction respectively). The solid materials have been characterised using a variety of diffractometric and spectroscopic techniques. The intimate contact between the two components during the synthesis leads to heterogeneous systems which are based on the presence, beside the two individual oxide phases, of a mixed phase of a cerium titanate (Ce 2 Ti 2 O 7 , pyrochlore structure) which contains Ce 3+ ions imparting particular optical properties to the solid 10 (pronounced red shift with respect to the band gap transition of the two oxides). Ce 3+ ions are present at the surface of the systems together with tetravalent Ce and Ti ions. The mixed solids can be reduced by annealing under vacuum and, upon reoxidation in mild conditions with O 2 , form superoxide species adsorbed on Ce 4+ which have, as already reported for low loading CeO 2 -TiO 2 systems, peculiar spectroscopic properties with respect to superoxide adsorbed on bare cerium dioxide.

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“…Besides that, all the samples shows hysteresis loop which has bimodal pore size distribution. This is due to two different type of aggregation in the samples; one is the finer intra-aggregated pore whereas the other one is the bigger interaggregated pore [28]. This could be due to particle size and shape which has influenced the structure of the pore [28].…”

Section: Characterizationmentioning

confidence: 99%

“…This is due to two different type of aggregation in the samples; one is the finer intra-aggregated pore whereas the other one is the bigger interaggregated pore [28]. This could be due to particle size and shape which has influenced the structure of the pore [28]. The hysteresis loop is due to capillary condensation of mesoporous sample [29].…”

Section: Characterizationmentioning

confidence: 99%

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CeO2-TiO2 Photocatalyst: Ionic Liquid-Mediated Synthesis, Characterization, and Performance for Diisopropanolamine Visible Light Degradation

Sivalingam¹,

Kait²,

Wilfred³

2017

Bull. Chem. React. Eng. Catal.

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CeO2-TiO2 photocatalyst with Ce:Ti molar ratio of 1:9 was synthesized via co-precipitation method in the presence of 1-ethyl-3-methyl imidazolium octylsulfate, [EMIM][OctSO4] (CeO2-TiO2-IL). The ionic liquid acts as a templating agent for particle growth. The CeO2-TiO2 and TiO2 photocatalysts were also synthesized without any ionic liquid for comparison. Calcination was conducted on the as-synthesized materials at 400 ˚C for 2 h. The photocatalysts were characterized using diffuse reflectance UV-Vis spectroscopy (DR-UV-Vis), field emission scanning electron microscopy (FESEM), X-ray powder diffraction (XRD), and surface area and pore size analyzer (SAP). The presence of CeO2 has changed the optical property of TiO2. It has extended the absorption edge of TiO2 from UV to visible region. The calculated band gap energy decreased from 2.82 eV (TiO2) to 2.30 eV (CeO2-TiO2-IL). The FESEM morphology showed that samples forms aggregates and the surface smoothens when ionic liquid was added. The average crystallite size of TiO2, CeO2-TiO2, and CeO2-TiO2-IL were 20.8 nm, 5.5 nm, and 4 nm. In terms of performance, photodegradation of 1000 ppm of diisopropanolamine (DIPA) was conducted in the presence of hydrogen peroxide (H2O2) and visible light irradiation which was provided by a 500 W halogen lamp. The best performance was displayed by CeO2-TiO2-IL calcined at 400 ˚C. It was able to remove 82.0% DIPA and 54.8% COD after 6 h reaction.

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Spectroscopic studies of interfacial structures of CeO2–TiO2 mixed oxides

Cited by 325 publications

References 42 publications

Sol–Gel Synthesis of Tunable Cerium Titanate Materials

Sol–Gel Synthesis of Tunable Cerium Titanate Materials

The interaction of oxygen with the surface of CeO₂–TiO₂ mixed systems: an example of fully reversible surface-to-molecule electron transfer

CeO2-TiO2 Photocatalyst: Ionic Liquid-Mediated Synthesis, Characterization, and Performance for Diisopropanolamine Visible Light Degradation

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Spectroscopic studies of interfacial structures of CeO2–TiO2 mixed oxides

Cited by 325 publications

References 42 publications

Sol–Gel Synthesis of Tunable Cerium Titanate Materials

Sol–Gel Synthesis of Tunable Cerium Titanate Materials

The interaction of oxygen with the surface of CeO2–TiO2 mixed systems: an example of fully reversible surface-to-molecule electron transfer

CeO2-TiO2 Photocatalyst: Ionic Liquid-Mediated Synthesis, Characterization, and Performance for Diisopropanolamine Visible Light Degradation

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The interaction of oxygen with the surface of CeO₂–TiO₂ mixed systems: an example of fully reversible surface-to-molecule electron transfer