Abstract
Immobilized TiO2-polyaniline (PANI) bilayer (TiO2-PBL) was fabricated on a glass plate for decolorization of methyl orange (MO). The thickness of TiO2-PBL was 25.55 μm with the ratio of 0.62:0.38 for TiO2 to PANI layer. It was observed that the TiO2-PBL system emitted less photoluminescence (PL) intensity than the TiO2 monolayer corresponding to better •OH radicals production with reduced band gap energy. The removal of MO from the solution after 90 min of treatment was 97% by TiO2-PBL and 53% by TiO2 monolayer which indicates the efficacy of the former system due to the synergistic photocatalytic-adsorption processes. The effect of prewashing (photoetching) of TiO2-PBL plate was pronounced as better removal efficiency of MO was observed for ten cycles under UV–vis and visible light irradiations. The results showed that the TiO2-PBL system has visible light active properties, reduces the recombination of photogenerated active species and enhances the photocatalytic oxidation of MO.
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