Sol-gel synthesis and photocatalytic activity of ZnO-SnO2 nanocomposites

Francesco Parrino, Agatino Di Paola, Leonardo Palmisano, Abdessalem Hamrouni, Ammar Houas, Noomen Moussa

Risultato della ricerca: Article

66 Citazioni (Scopus)

Abstract

ZnO-SnO2 nanocomposites were synthesized by a facile sol-gel synthesis route and characterized through X-ray diffraction, BET specific surface area analysis, UV-vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy. The photocatalytic activity of the samples was tested using the degradation of 4-nitrophenol under UV light as model reaction. The ZnO/SnO2 molar ratio was varied in order to study its influence on the photoefficiency of the samples. The ZnO-SnO2 nanocomposites showed higher photoactivity than the pure oxides and in particular the sample with ZnO/SnO2 molar ratio equal to 1/0.05 resulted the best one among the tested powders. The high activity of the mixed samples was attributed to the presence of heterojunctions between the two oxides, which allows an improved charge separation of the photogenerated electron-hole pairs, due to the differences between the energy levels of the conduction and valence bands of ZnO and SnO2. Photovoltage measurements were performed to determine the energy band structure of the ZnO-SnO2 heterojunction.
Lingua originaleEnglish
pagine (da-a)134-141
Numero di pagine8
RivistaJOURNAL OF MOLECULAR CATALYSIS. A: CHEMICAL
Volume390
Stato di pubblicazionePublished - 2014

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Band structure
Oxides
Sol-gels
Heterojunctions
Nanocomposites
nanocomposites
gels
Photoluminescence spectroscopy
synthesis
Valence bands
Conduction bands
Specific surface area
Ultraviolet radiation
Powders
Electron energy levels
heterojunctions
X ray photoelectron spectroscopy
Spectroscopy
Transmission electron microscopy
X ray diffraction

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

Cita questo

Sol-gel synthesis and photocatalytic activity of ZnO-SnO2 nanocomposites. / Parrino, Francesco; Di Paola, Agatino; Palmisano, Leonardo; Hamrouni, Abdessalem; Houas, Ammar; Moussa, Noomen.

In: JOURNAL OF MOLECULAR CATALYSIS. A: CHEMICAL, Vol. 390, 2014, pag. 134-141.

Risultato della ricerca: Article

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abstract = "ZnO-SnO2 nanocomposites were synthesized by a facile sol-gel synthesis route and characterized through X-ray diffraction, BET specific surface area analysis, UV-vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy. The photocatalytic activity of the samples was tested using the degradation of 4-nitrophenol under UV light as model reaction. The ZnO/SnO2 molar ratio was varied in order to study its influence on the photoefficiency of the samples. The ZnO-SnO2 nanocomposites showed higher photoactivity than the pure oxides and in particular the sample with ZnO/SnO2 molar ratio equal to 1/0.05 resulted the best one among the tested powders. The high activity of the mixed samples was attributed to the presence of heterojunctions between the two oxides, which allows an improved charge separation of the photogenerated electron-hole pairs, due to the differences between the energy levels of the conduction and valence bands of ZnO and SnO2. Photovoltage measurements were performed to determine the energy band structure of the ZnO-SnO2 heterojunction.",
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T1 - Sol-gel synthesis and photocatalytic activity of ZnO-SnO2 nanocomposites

AU - Parrino, Francesco

AU - Di Paola, Agatino

AU - Palmisano, Leonardo

AU - Hamrouni, Abdessalem

AU - Houas, Ammar

AU - Moussa, Noomen

PY - 2014

Y1 - 2014

N2 - ZnO-SnO2 nanocomposites were synthesized by a facile sol-gel synthesis route and characterized through X-ray diffraction, BET specific surface area analysis, UV-vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy. The photocatalytic activity of the samples was tested using the degradation of 4-nitrophenol under UV light as model reaction. The ZnO/SnO2 molar ratio was varied in order to study its influence on the photoefficiency of the samples. The ZnO-SnO2 nanocomposites showed higher photoactivity than the pure oxides and in particular the sample with ZnO/SnO2 molar ratio equal to 1/0.05 resulted the best one among the tested powders. The high activity of the mixed samples was attributed to the presence of heterojunctions between the two oxides, which allows an improved charge separation of the photogenerated electron-hole pairs, due to the differences between the energy levels of the conduction and valence bands of ZnO and SnO2. Photovoltage measurements were performed to determine the energy band structure of the ZnO-SnO2 heterojunction.

AB - ZnO-SnO2 nanocomposites were synthesized by a facile sol-gel synthesis route and characterized through X-ray diffraction, BET specific surface area analysis, UV-vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy. The photocatalytic activity of the samples was tested using the degradation of 4-nitrophenol under UV light as model reaction. The ZnO/SnO2 molar ratio was varied in order to study its influence on the photoefficiency of the samples. The ZnO-SnO2 nanocomposites showed higher photoactivity than the pure oxides and in particular the sample with ZnO/SnO2 molar ratio equal to 1/0.05 resulted the best one among the tested powders. The high activity of the mixed samples was attributed to the presence of heterojunctions between the two oxides, which allows an improved charge separation of the photogenerated electron-hole pairs, due to the differences between the energy levels of the conduction and valence bands of ZnO and SnO2. Photovoltage measurements were performed to determine the energy band structure of the ZnO-SnO2 heterojunction.

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VL - 390

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EP - 141

JO - Journal of Molecular Catalysis A: Chemical

JF - Journal of Molecular Catalysis A: Chemical

SN - 1381-1169

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