Physicochemical Study of Photocatalytic Activity of TiO2 Supported Palygorskite Clay Mineral
This study deals with the influence of physicochemical parameters, namely, the photocatalyst loading, dye concentration, and pH of polluted solutions, on the degradation efficiency of Orange G (OG) solutions containing TiO2 nanoparticles supported on palygorskite clay mineral (TiO2-Pal). The TiO2 ph...
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2013/815473 |
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| _version_ | 1832547502487764992 |
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| author | Lahcen Bouna Benaissa Rhouta Francis Maury |
| author_facet | Lahcen Bouna Benaissa Rhouta Francis Maury |
| author_sort | Lahcen Bouna |
| collection | DOAJ |
| description | This study deals with the influence of physicochemical parameters, namely, the photocatalyst loading, dye concentration, and pH of polluted solutions, on the degradation efficiency of Orange G (OG) solutions containing TiO2 nanoparticles supported on palygorskite clay mineral (TiO2-Pal). The TiO2 photocatalyst attached to natural palygorskite fibers was elaborated by colloidal sol-gel route. It exhibits the anatase structure that is the most photoactive crystallographic form. The highest performances of supported photocatalyst on OG degradation were found using an optimum amount of TiO2-Pal around 0.8 g·L−1, which corresponds properly to ca. 0.4 g·L−1 of TiO2. This amount is interestingly lower than the 2.5 g·L−1 generally reported when using pure unsupported TiO2 powder. The photodegradation rate increases by decreasing OG initial concentration, and it was found significantly higher when the OG solution is either acidic (pH<4) or basic (pH≈11). For OG concentrations in the range 5×10-6– 5×10-4 M, the kinetic law of the OG degradation in presence of TiO2-Pal is similar to that reported for unsupported TiO2 nanopowder. It follows a Langmuir-Hinshelwood model with a first-order reaction and an apparent rate constant of about 2.9×10-2 min−1. |
| format | Article |
| id | doaj-art-4a0c5932532b4269af26ae5ebec47501 |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-4a0c5932532b4269af26ae5ebec475012025-02-03T06:44:30ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2013-01-01201310.1155/2013/815473815473Physicochemical Study of Photocatalytic Activity of TiO2 Supported Palygorskite Clay MineralLahcen Bouna0Benaissa Rhouta1Francis Maury2Laboratoire de Matière Condensée et Nanostructures (LMCN), Faculté des Sciences et Techniques Guéliz, Université Cadi Ayyad, BP 549, 40 000 Marrakech, MoroccoLaboratoire de Matière Condensée et Nanostructures (LMCN), Faculté des Sciences et Techniques Guéliz, Université Cadi Ayyad, BP 549, 40 000 Marrakech, MoroccoCIRIMAT, Université de Toulouse, CNRS-UPS-INP, ENSIACET, 4 allée Emile Monso, BP 44362, 31030 Toulouse Cedex 4, FranceThis study deals with the influence of physicochemical parameters, namely, the photocatalyst loading, dye concentration, and pH of polluted solutions, on the degradation efficiency of Orange G (OG) solutions containing TiO2 nanoparticles supported on palygorskite clay mineral (TiO2-Pal). The TiO2 photocatalyst attached to natural palygorskite fibers was elaborated by colloidal sol-gel route. It exhibits the anatase structure that is the most photoactive crystallographic form. The highest performances of supported photocatalyst on OG degradation were found using an optimum amount of TiO2-Pal around 0.8 g·L−1, which corresponds properly to ca. 0.4 g·L−1 of TiO2. This amount is interestingly lower than the 2.5 g·L−1 generally reported when using pure unsupported TiO2 powder. The photodegradation rate increases by decreasing OG initial concentration, and it was found significantly higher when the OG solution is either acidic (pH<4) or basic (pH≈11). For OG concentrations in the range 5×10-6– 5×10-4 M, the kinetic law of the OG degradation in presence of TiO2-Pal is similar to that reported for unsupported TiO2 nanopowder. It follows a Langmuir-Hinshelwood model with a first-order reaction and an apparent rate constant of about 2.9×10-2 min−1.http://dx.doi.org/10.1155/2013/815473 |
| spellingShingle | Lahcen Bouna Benaissa Rhouta Francis Maury Physicochemical Study of Photocatalytic Activity of TiO2 Supported Palygorskite Clay Mineral International Journal of Photoenergy |
| title | Physicochemical Study of Photocatalytic Activity of TiO2 Supported Palygorskite Clay Mineral |
| title_full | Physicochemical Study of Photocatalytic Activity of TiO2 Supported Palygorskite Clay Mineral |
| title_fullStr | Physicochemical Study of Photocatalytic Activity of TiO2 Supported Palygorskite Clay Mineral |
| title_full_unstemmed | Physicochemical Study of Photocatalytic Activity of TiO2 Supported Palygorskite Clay Mineral |
| title_short | Physicochemical Study of Photocatalytic Activity of TiO2 Supported Palygorskite Clay Mineral |
| title_sort | physicochemical study of photocatalytic activity of tio2 supported palygorskite clay mineral |
| url | http://dx.doi.org/10.1155/2013/815473 |
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