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Ullah, S.; Ferreira-Neto, E.P.; Pasa, A.A.; Alcântara, C.C.J.; Acuña, J.J.S.; Bilmes, S.A.; Martínez Ricci, M.L.; Landers, R.; Fermino, T.Z.; Rodrigues-Filho, U.P. "Enhanced photocatalytic properties of core@shell SiO2@TiO2 nanoparticles" (2015) Applied Catalysis B: Environmental. 179:333-343
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Abstract:

SiO2@TiO2 core@shell nanoparticles (CSNs) have recently attracted great attention due to their unique and tunable optical and photocatalytic properties and higher dispersion of the supported TiO2. Thus, development of facile, reproducible and effective methods for the synthesis of SiO2@TiO2 CSNs and a fundamental understanding of their improved properties, derived from combination of different core and shell materials, is of great importance. Here we report a very facile and reproducible method for the synthesis of CSNs with a control of particle morphology, crystallinity and phase selectivity, and provide important insight into the effect of core@shell configuration on the photocatalytic and optical properties of SiO2@TiO2 CSNs. For this purpose, synthesis of highly dispersed anatase nanocrystals (~5nm) of high surface area was carried out by supporting these nanocrystals on silica sub-micron spheres in the form of a porous shell of controlled thickness (10-30nm). The amorphous TiO2 shell was crystallized into anatase using a low temperature (105°C) hydrothermal treatment. The resulting CSNs were characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, x-ray photoelectron spectroscopy, X-ray diffraction, vibrational spectroscopy, zeta-potential measurements, BET surface area and electron paramagnetic resonance measurements. Both experimental data and theoretical simulations showed that due to the size of the complete particle (SiO2@TiO2), the general optical response of the system is regulated by Rayleigh scattering, exhibiting a red-shift of the extinction spectra as shell-thickness increases. The SiO2@TiO2 configuration leads to efficient light harvesting by increasing the optical path inside the core@shell particles. An enhanced photoactivity and good recyclability of SiO2@TiO2 CSNs was demonstrated compared to unsupported TiO2. Together with BET surface area measurements, direct assessment of the density of photocatalytic sites probed by electron paramagnetic resonance measurements was used to provide insight into the enhanced photocatalytic activity of CSNs, which is also understood as a consequence of Rayleigh scattering, relative enhancement of the adsorption of organic molecules on the core@shell photocatalyst surface and increased optical path inside the SiO2@TiO2 particles. All these aspects are directly influenced by the core@shell configuration of SiO2@TiO2 samples. © 2015 Elsevier B.V.

Registro:

Documento: Artículo
Título:Enhanced photocatalytic properties of core@shell SiO2@TiO2 nanoparticles
Autor:Ullah, S.; Ferreira-Neto, E.P.; Pasa, A.A.; Alcântara, C.C.J.; Acuña, J.J.S.; Bilmes, S.A.; Martínez Ricci, M.L.; Landers, R.; Fermino, T.Z.; Rodrigues-Filho, U.P.
Filiación:Grupo de Química de Materiais Híbridos e Inorgânicos, Instituto de Química de São Carlos, Universidade de São Paulo, PO Box 780, São Carlos, São Paulo, 13564-970, Brazil
Institute of Chemical Sciences, University of Peshawar, Peshawar, 25120 KP, Pakistan
Laboratório de Filmes Finos e Superfícies, Departamento da Física, Universidade Federal de Santa Catarina, PO Box 476, Florianópolis, SC, 88040-900, Brazil
Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Sao Paulo, Brazil
Instituto de Química Física de los Materiales Medio Ambiente y Energía, INQUIMAE, DQIAQF, Facultad Ciencias Exactas y Naturales, Ciudad Universitaria, Universidad de Buenos Aires, Buenos Aires, Pabellón 2, C1428EHA, Argentina
Instituto de Física Gleb Wataghin (IFGW), Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
Palabras clave:Core@shell; Optical properties; Photocatalysis; Quantum size effect; Rayleigh scattering; SiO2@TiO2; Electron microscopy; Electron resonance; Electrons; Energy dispersive spectroscopy; Magnetic resonance; Nanoparticles; Optical properties; Paramagnetic resonance; Paramagnetism; Photocatalysis; Photocatalysts; Rayleigh scattering; Scanning electron microscopy; Titanium dioxide; Transmission electron microscopy; X ray diffraction; X ray photoelectron spectroscopy; X ray scattering; Adsorption of organic molecules; BET surface area measurement; Core shell; Core-shell nanoparticles; Photocatalytic activities; Quantum size effects; TiO; Zeta potential measurements; Shells (structures)
Año:2015
Volumen:179
Página de inicio:333
Página de fin:343
DOI: http://dx.doi.org/10.1016/j.apcatb.2015.05.036
Título revista:Applied Catalysis B: Environmental
Título revista abreviado:Appl. Catal. B Environ.
ISSN:09263373
CODEN:ACBEE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09263373_v179_n_p333_Ullah

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Citas:

---------- APA ----------
Ullah, S., Ferreira-Neto, E.P., Pasa, A.A., Alcântara, C.C.J., Acuña, J.J.S., Bilmes, S.A., Martínez Ricci, M.L.,..., Rodrigues-Filho, U.P. (2015) . Enhanced photocatalytic properties of core@shell SiO2@TiO2 nanoparticles. Applied Catalysis B: Environmental, 179, 333-343.
http://dx.doi.org/10.1016/j.apcatb.2015.05.036
---------- CHICAGO ----------
Ullah, S., Ferreira-Neto, E.P., Pasa, A.A., Alcântara, C.C.J., Acuña, J.J.S., Bilmes, S.A., et al. "Enhanced photocatalytic properties of core@shell SiO2@TiO2 nanoparticles" . Applied Catalysis B: Environmental 179 (2015) : 333-343.
http://dx.doi.org/10.1016/j.apcatb.2015.05.036
---------- MLA ----------
Ullah, S., Ferreira-Neto, E.P., Pasa, A.A., Alcântara, C.C.J., Acuña, J.J.S., Bilmes, S.A., et al. "Enhanced photocatalytic properties of core@shell SiO2@TiO2 nanoparticles" . Applied Catalysis B: Environmental, vol. 179, 2015, pp. 333-343.
http://dx.doi.org/10.1016/j.apcatb.2015.05.036
---------- VANCOUVER ----------
Ullah, S., Ferreira-Neto, E.P., Pasa, A.A., Alcântara, C.C.J., Acuña, J.J.S., Bilmes, S.A., et al. Enhanced photocatalytic properties of core@shell SiO2@TiO2 nanoparticles. Appl. Catal. B Environ. 2015;179:333-343.
http://dx.doi.org/10.1016/j.apcatb.2015.05.036