| Titre : |
Study Of The Photocatalytic Activity Of Nanomaterials Based On Metal Oxides Semiconductors |
| Type de document : |
texte imprimé |
| Auteurs : |
Nail El Hocine Barama, Auteur ; Khadidja Boukheche, Auteur ; Sebais M., Directeur de thèse |
| Editeur : |
CONSTANTINE [ALGERIE] : Université Frères Mentouri Constantine |
| Année de publication : |
2020 |
| Importance : |
61 f. |
| Format : |
30 cm. |
| Note générale : |
Une copie électronique PDF disponible en BUC. |
| Langues : |
Anglais (eng) |
| Catégories : |
Sciences Exactes:Physique
|
| Tags : |
Nanomaterials
Based On Metal Oxides Semiconductors |
| Index. décimale : |
530 Physique |
| Résumé : |
In this work, we synthetized Sr-doped copper oxide CuO nanoparticles by the hydrothermal
process. Copper sulfate (CuSO4) and strontium chloride (SrCl2) have been used as precursor
chemical compounds.
The characterization of the nanoparticles has been made using X-ray diffraction, infrared
spectroscopy and UV-Vis spectroscopy.
Analyzes carried out using X-ray diffraction and infrared spectroscopy demonstrated the formation
of the pure CuO phase as well as the SrO phase in the case of doped powders. The proportion of
this last phase increases with the initial SrCl2 additions.
Particle size approach from diffraction spectra data using both Scherrer's formula and WilliamsonHall deconvolution method confirmed a nanostructured particle (with a size varying between 13,71
and 18,66 nm by Scherrer and 27,13 and 40,78 nm by Williamson-Hall). The latter method also
revealed residual strains of around 0.2%.
The obtained nanoparticles contained a quite higher density of dislocations of about 1015 m-2.
Furthermore, the estimated specific surface area of the nanoparticles (based on X-ray diffraction
data and assuming different particle shapes) was in the order of a few tens of m2.
Tauc method used to approach the band gap of CuO phase showed a blue shift of the gap (Eg 1.74
eV) probably in consequence of the optic confinement by the nanoparticles.
Finally, testes absorbance carried out on MB solutions containing different powders and submitted
to UV radiation revealed a maximum of photocatalytic degradation in solution containing pure
CuO powders. The degradation of MB compound decreases in the case of solutions containing
doped powders. Nevertheless, the evolution of the degradation rate as function of added Sr is very
complex due to the number of antagonist factors (band gap, specific surface, dislocation density,
secondary SrO phase proportion) which influence the photocatalytic effect. |
| Diplome : |
Master 2 |
| Permalink : |
https://bu.umc.edu.dz/master/index.php?lvl=notice_display&id=14064 |
Study Of The Photocatalytic Activity Of Nanomaterials Based On Metal Oxides Semiconductors [texte imprimé] / Nail El Hocine Barama, Auteur ; Khadidja Boukheche, Auteur ; Sebais M., Directeur de thèse . - CONSTANTINE [ALGERIE] : Université Frères Mentouri Constantine, 2020 . - 61 f. ; 30 cm. Une copie électronique PDF disponible en BUC. Langues : Anglais ( eng)
| Catégories : |
Sciences Exactes:Physique
|
| Tags : |
Nanomaterials
Based On Metal Oxides Semiconductors |
| Index. décimale : |
530 Physique |
| Résumé : |
In this work, we synthetized Sr-doped copper oxide CuO nanoparticles by the hydrothermal
process. Copper sulfate (CuSO4) and strontium chloride (SrCl2) have been used as precursor
chemical compounds.
The characterization of the nanoparticles has been made using X-ray diffraction, infrared
spectroscopy and UV-Vis spectroscopy.
Analyzes carried out using X-ray diffraction and infrared spectroscopy demonstrated the formation
of the pure CuO phase as well as the SrO phase in the case of doped powders. The proportion of
this last phase increases with the initial SrCl2 additions.
Particle size approach from diffraction spectra data using both Scherrer's formula and WilliamsonHall deconvolution method confirmed a nanostructured particle (with a size varying between 13,71
and 18,66 nm by Scherrer and 27,13 and 40,78 nm by Williamson-Hall). The latter method also
revealed residual strains of around 0.2%.
The obtained nanoparticles contained a quite higher density of dislocations of about 1015 m-2.
Furthermore, the estimated specific surface area of the nanoparticles (based on X-ray diffraction
data and assuming different particle shapes) was in the order of a few tens of m2.
Tauc method used to approach the band gap of CuO phase showed a blue shift of the gap (Eg 1.74
eV) probably in consequence of the optic confinement by the nanoparticles.
Finally, testes absorbance carried out on MB solutions containing different powders and submitted
to UV radiation revealed a maximum of photocatalytic degradation in solution containing pure
CuO powders. The degradation of MB compound decreases in the case of solutions containing
doped powders. Nevertheless, the evolution of the degradation rate as function of added Sr is very
complex due to the number of antagonist factors (band gap, specific surface, dislocation density,
secondary SrO phase proportion) which influence the photocatalytic effect. |
| Diplome : |
Master 2 |
| Permalink : |
https://bu.umc.edu.dz/master/index.php?lvl=notice_display&id=14064 |
|
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