Characterization of structural and optical properties of the mesoporous Ce-MCM-41 hybrid materials

O. A. González Vargas, J. A. de Los Reyes Heredia, V. A. Suárez-Toriello, R. Hurtado Rangel, J. A. Wang, L. F. Chen

Research output: Contribution to journalArticle

Abstract

© 2018 Springer Science+Business Media, LLC, part of Springer Nature Ce-modified mesostructured MCM-41-type hybrid materials with different Si/Ce molar ratios (Si/Ce = 10, 30 and 50) were synthesized by the surfactant-assisted hydrothermal method and their structural and optical properties were characterized by small angle X-ray scattering (SAXS), field emission scanning electron microscopy (FE-SEM) equipped with embedded EDS system, ultraviolet and visible diffuse reflectance (UV–vis DR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Ce-MCM-41 samples show highly ordered 2D porous hexagonal mesostructures and oval and spherical morphologies with particle size between 300 and 600 nm, depending on the incorporated Ce amount. Incorporation of Ce 4+ into ordered mesoporous silica generates oxygen defects in ceria-silica composites with the formation of Ce 3+ species as confirmed by the XPS analyses. Cerium incorporation modified their structural regularity and resulted in an effective red shifting of the band gap (2.82 eV at 2.64 eV) due to the creation of intermediate energy states. Both asymmetry and broadening of Raman active F 2g mode confirmed the presence of the structural defects. These ordered mesoporous Ce-MCM-41 hybrid materials are potentially attractive for their use as novel photocatalysts in the degradation of organic pollutants present in wastewater employing UV and visible light.
Original languageAmerican English
Pages (from-to)1-11
Number of pages11
JournalJournal of Materials Science: Materials in Electronics
DOIs
StatePublished - 27 Apr 2018

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Hybrid materials
Multicarrier modulation
Structural properties
Optical properties
optical properties
Silicon Dioxide
X ray photoelectron spectroscopy
Silica
photoelectron spectroscopy
silicon dioxide
Cerium
Defects
x rays
Organic pollutants
Cerium compounds
defects
Photocatalysts
cerium
X ray scattering
regularity

Cite this

González Vargas, O. A. ; de Los Reyes Heredia, J. A. ; Suárez-Toriello, V. A. ; Hurtado Rangel, R. ; Wang, J. A. ; Chen, L. F. / Characterization of structural and optical properties of the mesoporous Ce-MCM-41 hybrid materials. In: Journal of Materials Science: Materials in Electronics. 2018 ; pp. 1-11.
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Characterization of structural and optical properties of the mesoporous Ce-MCM-41 hybrid materials. / González Vargas, O. A.; de Los Reyes Heredia, J. A.; Suárez-Toriello, V. A.; Hurtado Rangel, R.; Wang, J. A.; Chen, L. F.

In: Journal of Materials Science: Materials in Electronics, 27.04.2018, p. 1-11.

Research output: Contribution to journalArticle

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AU - de Los Reyes Heredia, J. A.

AU - Suárez-Toriello, V. A.

AU - Hurtado Rangel, R.

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N2 - © 2018 Springer Science+Business Media, LLC, part of Springer Nature Ce-modified mesostructured MCM-41-type hybrid materials with different Si/Ce molar ratios (Si/Ce = 10, 30 and 50) were synthesized by the surfactant-assisted hydrothermal method and their structural and optical properties were characterized by small angle X-ray scattering (SAXS), field emission scanning electron microscopy (FE-SEM) equipped with embedded EDS system, ultraviolet and visible diffuse reflectance (UV–vis DR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Ce-MCM-41 samples show highly ordered 2D porous hexagonal mesostructures and oval and spherical morphologies with particle size between 300 and 600 nm, depending on the incorporated Ce amount. Incorporation of Ce 4+ into ordered mesoporous silica generates oxygen defects in ceria-silica composites with the formation of Ce 3+ species as confirmed by the XPS analyses. Cerium incorporation modified their structural regularity and resulted in an effective red shifting of the band gap (2.82 eV at 2.64 eV) due to the creation of intermediate energy states. Both asymmetry and broadening of Raman active F 2g mode confirmed the presence of the structural defects. These ordered mesoporous Ce-MCM-41 hybrid materials are potentially attractive for their use as novel photocatalysts in the degradation of organic pollutants present in wastewater employing UV and visible light.

AB - © 2018 Springer Science+Business Media, LLC, part of Springer Nature Ce-modified mesostructured MCM-41-type hybrid materials with different Si/Ce molar ratios (Si/Ce = 10, 30 and 50) were synthesized by the surfactant-assisted hydrothermal method and their structural and optical properties were characterized by small angle X-ray scattering (SAXS), field emission scanning electron microscopy (FE-SEM) equipped with embedded EDS system, ultraviolet and visible diffuse reflectance (UV–vis DR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Ce-MCM-41 samples show highly ordered 2D porous hexagonal mesostructures and oval and spherical morphologies with particle size between 300 and 600 nm, depending on the incorporated Ce amount. Incorporation of Ce 4+ into ordered mesoporous silica generates oxygen defects in ceria-silica composites with the formation of Ce 3+ species as confirmed by the XPS analyses. Cerium incorporation modified their structural regularity and resulted in an effective red shifting of the band gap (2.82 eV at 2.64 eV) due to the creation of intermediate energy states. Both asymmetry and broadening of Raman active F 2g mode confirmed the presence of the structural defects. These ordered mesoporous Ce-MCM-41 hybrid materials are potentially attractive for their use as novel photocatalysts in the degradation of organic pollutants present in wastewater employing UV and visible light.

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