Influence de certains ions inorganiques, de l'éthanol et du peroxyde d'hydrogène sur la photominéralisation du β-naphtol en présence de TiO2 |
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Authors: | Samir Qourzal Malika Tamimi Ali Assabbane Yhya Ait-Ichou |
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Institution: | aÉquipe de photocatalyse et environnement, laboratoire de chimie physique, département de chimie, faculté des sciences, université Ibn-Zohr, BP 8106 Cité Dakhla, 80000 Agadir, Maroc |
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Abstract: | TiO2 photocatalytic mineralization of β-naphthol: influence of some inorganic ions, ethanol, and hydrogen peroxide. In this work, the photocatalytic oxidation of β-naphthol in aqueous suspensions of TiO2 was investigated at room temperature, by following the formation of CO2. The disappearance of β-naphthol fits a Langmuir-Hinshelwood kinetic model. The activation energy for the degradation reaction of β-naphthol is estimated at 10.2 kJ/mol. The effects of some additives such as ethanol, H2O2, and inorganic ions (Cl−, SO42−, HCO3−, NO3−, Fe3+, Cu2+, and Cr3+) on the photomineralization of β-naphthol were examined. The inhibition of the anions for this reaction was in the order : NO3− < HCO3− < SO42− < Cl−. This can be due to a partial blockage of catalyst active sites by these ions or their reaction with an oxidizing radical such as OH. The most photoactive systems for β-naphthol degradation were found in the presence of ferric ions, while the addition of Cr3+ strongly inhibited the photocatalytic decomposition of β-naphthol. |
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