Preparation and characterization of a new TiO2/SiO2 composite catalyst for photocatalytic degradation of indigo carmin |
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| Authors: | Ouafa Tahiri Alaoui Quang Trong Nguyen Touria Rhlalou |
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| Institution: | (1) “Polymers, Biopolymers Membranes” Department, UMR 6522, CNRS, Rouen University, 76821 Mont-Saint-Aignan Cedex, France;(2) Department of Chemistry, Hassan Ier University, Settat, Morocco; |
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| Abstract: | The TiO2/SiO2 composite was prepared by means of the SiO2-particle-entrapment method. The FTIR data showed the presence of Si–O–Ti stretching vibration band at 970 cm−1 in the TiO2/SiO2 composite, suggesting a reaction between TiO2 and silica on the TiO2 particle surface during the silicagel formation around the TiO2 particles. The photocatalytic efficiency of TiO2 immobilized in silicagel was compared with that of the conventional TiO2 Degussa P25 catalyst. For this purpose, the degradation of indigo carmin (IC) dye was used as model molecule in the tests.
The effect of operational parameters such as catalyst loading and dye concentration on the photocatalytic degradation of the
model dye was investigated. The rate of degradation increased with increasing catalyst loading, and when the concentration
of the dye decreases. |
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