Abstract
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 Ce4+ into ordered mesoporous silica generates oxygen defects in ceria-silica composites with the formation of Ce3+ 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 F2g 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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Acknowledgements
O.A. González Vargas thanks the Instituto Politécnico Nacional (IPN), Mexico, for financial aid to carry out this research. We are grateful to Dr. H. Martinez Gutierrez and Dr. Luis Lartundo Rojas (CNMN-IPN, Mexico) for their kind cooperation with FE-SEM, SEM-EDS and XPS experiments. The authors would like to acknowledge the financial support from IPN, Mexico (SIP-20170900).
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González Vargas, O.A., De los Reyes Heredia, J.A., Suárez-Toriello, V.A. et al. Characterization of structural and optical properties of the mesoporous Ce-MCM-41 hybrid materials. J Mater Sci: Mater Electron 29, 15621–15631 (2018). https://doi.org/10.1007/s10854-018-9154-5
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DOI: https://doi.org/10.1007/s10854-018-9154-5