Preparation, characterization and photocatalytic performance of Mo-doped ZnO photocatalysts
A series of Mo-doped ZnO photocatalysts with different Mo-dopant concentrations have been prepared by a grinding- calcination method. The structure of these photocatalysts was characterized by a variety of methods, including N 2 physical adsorption, X-ray diffraction (XRD), scanning electron microsc...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Published: |
2012
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| Online Access: | http://hdl.handle.net/20.500.11937/34755 |
| _version_ | 1848754309436538880 |
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| author | Yu, C. Yang, K. Shu, Q. Yu, J. Cao, F. Li, Xin Yong Zhou, X. |
| author_facet | Yu, C. Yang, K. Shu, Q. Yu, J. Cao, F. Li, Xin Yong Zhou, X. |
| author_sort | Yu, C. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | A series of Mo-doped ZnO photocatalysts with different Mo-dopant concentrations have been prepared by a grinding- calcination method. The structure of these photocatalysts was characterized by a variety of methods, including N 2 physical adsorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, photoluminescence (PL) emission spectroscopy, and UV-vis diffuse reflectance spectroscopy (DRS). It was found that Mo 6+ could enter into the crystal lattice of ZnO due to the radius of Mo 6+ (0.065 nm) being smaller than that of Zn 2+ (0.083 nm). XRD results indicated that Mo 6+ suppressed the growth of ZnO crystals. The FT-IR spectroscopy results showed that the ZnO with 2 wt.% Mo-doping has a higher level of surface hydroxyl groups than pure ZnO. PL spectroscopy indicated that ZnO with 2 wt.% Mo-doping also exhibited the largest reduction in the intensity of the emission peak at 390 nm caused by the recombination of photogenerated hole-electron pairs. The activities of the Mo-doped ZnO photocatalysts were investigated in the photocatalytic degradation of acid orange II under UV light (? = 365 nm) irradiation. It was found that ZnO with 2 wt.% Mo-doping showed much higher photocatalytic activity and stability than pure ZnO. The high photocatalytic performance of the Mo-doped ZnO can be attributed to a great improvement in the surface properties of ZnO, higher crystallinity and lower recombination rate of photogenerated hole-electron (e -/h +) pairs. Moreover, the undoped Mo species may exist in the form of MoO 3 and form MoO 3/ZnO heterojunctions which further favors the separation of e -/h + pairs. © Science China Press and Springer-Verlag Berlin Heidelberg 2012. |
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| format | Journal Article |
| id | curtin-20.500.11937-34755 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:38:22Z |
| publishDate | 2012 |
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| spelling | curtin-20.500.11937-347552017-09-13T15:24:47Z Preparation, characterization and photocatalytic performance of Mo-doped ZnO photocatalysts Yu, C. Yang, K. Shu, Q. Yu, J. Cao, F. Li, Xin Yong Zhou, X. A series of Mo-doped ZnO photocatalysts with different Mo-dopant concentrations have been prepared by a grinding- calcination method. The structure of these photocatalysts was characterized by a variety of methods, including N 2 physical adsorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, photoluminescence (PL) emission spectroscopy, and UV-vis diffuse reflectance spectroscopy (DRS). It was found that Mo 6+ could enter into the crystal lattice of ZnO due to the radius of Mo 6+ (0.065 nm) being smaller than that of Zn 2+ (0.083 nm). XRD results indicated that Mo 6+ suppressed the growth of ZnO crystals. The FT-IR spectroscopy results showed that the ZnO with 2 wt.% Mo-doping has a higher level of surface hydroxyl groups than pure ZnO. PL spectroscopy indicated that ZnO with 2 wt.% Mo-doping also exhibited the largest reduction in the intensity of the emission peak at 390 nm caused by the recombination of photogenerated hole-electron pairs. The activities of the Mo-doped ZnO photocatalysts were investigated in the photocatalytic degradation of acid orange II under UV light (? = 365 nm) irradiation. It was found that ZnO with 2 wt.% Mo-doping showed much higher photocatalytic activity and stability than pure ZnO. The high photocatalytic performance of the Mo-doped ZnO can be attributed to a great improvement in the surface properties of ZnO, higher crystallinity and lower recombination rate of photogenerated hole-electron (e -/h +) pairs. Moreover, the undoped Mo species may exist in the form of MoO 3 and form MoO 3/ZnO heterojunctions which further favors the separation of e -/h + pairs. © Science China Press and Springer-Verlag Berlin Heidelberg 2012. 2012 Journal Article http://hdl.handle.net/20.500.11937/34755 10.1007/s11426-012-4721-8 restricted |
| spellingShingle | Yu, C. Yang, K. Shu, Q. Yu, J. Cao, F. Li, Xin Yong Zhou, X. Preparation, characterization and photocatalytic performance of Mo-doped ZnO photocatalysts |
| title | Preparation, characterization and photocatalytic performance of Mo-doped ZnO photocatalysts |
| title_full | Preparation, characterization and photocatalytic performance of Mo-doped ZnO photocatalysts |
| title_fullStr | Preparation, characterization and photocatalytic performance of Mo-doped ZnO photocatalysts |
| title_full_unstemmed | Preparation, characterization and photocatalytic performance of Mo-doped ZnO photocatalysts |
| title_short | Preparation, characterization and photocatalytic performance of Mo-doped ZnO photocatalysts |
| title_sort | preparation, characterization and photocatalytic performance of mo-doped zno photocatalysts |
| url | http://hdl.handle.net/20.500.11937/34755 |