Photocatalytic activity of Al2O3 improved by the addition of Ce3+/Ce4+ synthesized by the sol-gel method. Photodegradation of phenolic compounds using UV light

Piña-Pérez, Yanet; Tzompantzi-Morales, Francisco; Pérez-Hernández, R.; Arroyo, R.; Acevedo–Peña, Próspero; Gómez-Romero, R.

doi:10.1016/j.fuel.2016.12.040

Cited by 57 publications

(14 citation statements)

References 49 publications

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“…The O 1S peak was fitted. The SrTiO 3 of pure O 1S can be divided into three peaks at 529.28, 530.73, and 532.55 eV [ 8 , 16 , 17 ], respectively, as shown in Figure 8 b marked “1”, “2” and “3”. The “1” peak belonged to the characteristic peak of lattice oxygen, and the “2” peak was born of the adsorbed oxygen on the surface.…”

Section: Resultsmentioning

confidence: 99%

“…However, Ce 4+ doped SrTiO 3 in 500 nm wavelength produced an observable characteristic absorption peak. The absorption peak could be ascribable to electronic transitions of Ce 4+ [ 8 ]. This further proved that Ce 4+ had entered into the crystal lattice of SrTiO 3 .…”

Section: Resultsmentioning

confidence: 99%

“…It is the ideal application by which to dope elements for photocatalyst modification. Previous research has suggested [ 5 , 6 , 7 , 8 , 9 ] electron transfer between Ce 4+ and Ce 3+ may enhance photocatalytic activity of ZnO, Al 2 O 3 , and TiO 2 as a result of the Ce dopant capturing the photogenerated electrons and suppressing the recombination of electron–hole pairs. In addition, an appropriate amount of doped Ce may enhance the property of corrosion resistance to ensure reuse for the modified products.…”

Section: Introductionmentioning

confidence: 99%

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New Insights into Sensitization Mechanism of the Doped Ce (IV) into Strontium Titanate

et al. 2018

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SrTiO3 and Ce4+ doped SrTiO3 were synthesized by a modified sol–gel process. The optimization synthesis parameters were obtained by a series of single factor experiments. Interesting phenomena are observable in Ce4+ doped SrTiO3 systems. Sr2+ in SrTiO3 system was replaced by Ce4+, which reduced the surface segregation of Ti4+, ameliorated agglomeration, increased specific surface area more than four times compared with pure SrTiO3, and enhanced quantum efficiency for SrTiO3. Results showed that Ce4+ doping increased the physical adsorption of H2O and adsorbed oxygen on the surface of SrTiO3, which produced additional catalytic active centers. Electrons on the 4f energy level for Ce4+ produced new energy states in the band gap of SrTiO3, which not only realized the use of visible light but also led to an easier separation between the photogenerated electrons and holes. Ce4+ repeatedly captured photoelectrons to produce Ce3+, which inhibited the recombination between photogenerated electrons and holes as well as prolonged their lifetime; it also enhanced quantum efficiency for SrTiO3. The methylene blue (MB) degradation efficiency reached 98.7% using 3 mol % Ce4+ doped SrTiO3 as a photocatalyst, indicating highly photocatalytic activity.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New Insights into Sensitization Mechanism of the Doped Ce (IV) into Strontium Titanate

et al. 2018

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“…The O 2 * À is the main oxidant specie that starts the phenol degradation process through the formation of intermediates until a complete mineralization. [43] It is important to mention that, the photogenerated holes seem to be directly oxidizing water to oxygen, since an enhancement on the generation rate of * OH radicals was not observed when using the Ce 3 + -doped CeO 2 photocatalysts. Therefore, it can be concluded that the main oxidizing species are the superoxide radicals that come from the electronic exchange on the surface of the material between the adsorbed molecular oxygen and the water molecules.…”

Section: Photocatalytic Behavior and Reaction Mechanismmentioning

confidence: 98%

Effect of the Oxygen Vacancies in CeO₂ by the Ce³⁺ Incorporation to Enhance the Photocatalytic Mineralization of Phenol

et al. 2021

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In this paper, the phenol mineralization by Ce 3 + -doped CeO 2 by photocatalysis at room temperature, is shown for the first time. The photocatalytic behavior of CeO 2 was improved through the incorporation of Ce 3 + into its crystalline lattice. The materials were prepared by the precipitation method at low temperatures varying the Ce 4 + :Ce 3 + molar ratio of the precursors during the synthesis process. It is worth noting that, the synthesized photocatalysts did not carry out a thermal treatment after their preparation. The results obtained from Raman analysis demonstrated the formation of oxygen vacancies by the incorporation of Ce 3 + . The improvement of the photocatalytic activity was attributed to an optimal content of Ce 3 + which promoted structural defects (such as oxygen vacancies). Radical species, such as O 2 * À , are mainly formed during the photocatalytic process, which are probably the main responsible for inducing the mineralization process of the studied pollutant.

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“…), ядерных реакторов, а также в медицине (изотопы при лечении опухолей). Церий используется в качестве легирующей добавки в сплавах хрома и никеля, сплавы церия с магнием и алюминием -в авиастроении, диоксид церия -для шлифовки и полировки оптического стекла и в качестве катализаторов при получении органических соединений [1][2][3][4][5][6][7][8][9][10][11][12][13][14]…”

Section: Introductionunclassified

Determination of Cerium in Filtrates After Sorption by Stripping Voltammetry on Solid Electrodes

Zimonin¹,

Burmakina²,

Nedelina³

et al. 2017

J. Sib. Fed. Univ. Chem.

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А stripping voltammetry method was developed for the determination of cerium (III) on graphite electrode as a poorly soluble compound in filtrate after sorption. The cerium (III) concentration presents a good linear relationship over the range of 0.5-10 mg/l. Its linear equation is I = (0.56±0.03)с + + (0.54±0.10), with a correlation coefficient >0.99. The detection limit of cerium (III) is 0.1 mg/l. The absence of a significant systematic error is shown by the added-found method. Using the developed technique, the concentration of cerium (III) in the filtrates after sorption has been determined.

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Photocatalytic activity of Al2O3 improved by the addition of Ce3+/Ce4+ synthesized by the sol-gel method. Photodegradation of phenolic compounds using UV light

Cited by 57 publications

References 49 publications

New Insights into Sensitization Mechanism of the Doped Ce (IV) into Strontium Titanate

New Insights into Sensitization Mechanism of the Doped Ce (IV) into Strontium Titanate

Effect of the Oxygen Vacancies in CeO₂ by the Ce³⁺ Incorporation to Enhance the Photocatalytic Mineralization of Phenol

Determination of Cerium in Filtrates After Sorption by Stripping Voltammetry on Solid Electrodes

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Photocatalytic activity of Al2O3 improved by the addition of Ce3+/Ce4+ synthesized by the sol-gel method. Photodegradation of phenolic compounds using UV light

Cited by 57 publications

References 49 publications

New Insights into Sensitization Mechanism of the Doped Ce (IV) into Strontium Titanate

New Insights into Sensitization Mechanism of the Doped Ce (IV) into Strontium Titanate

Effect of the Oxygen Vacancies in CeO2 by the Ce3+ Incorporation to Enhance the Photocatalytic Mineralization of Phenol

Determination of Cerium in Filtrates After Sorption by Stripping Voltammetry on Solid Electrodes

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Effect of the Oxygen Vacancies in CeO₂ by the Ce³⁺ Incorporation to Enhance the Photocatalytic Mineralization of Phenol