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Abstract
A method for immobilizing TiO2–PANI composite using ENR and PVC as adhesives was successfully developed. The immobilized system known as TiO2/PANI/ENR/PVC plate was characterized by FTIR, Raman, diffuse reflectance UV–vis, photo luminescence spectroscopy and HRTEM. The optimum weight ratio for the TiO2:PANI composite was 1:0.0035. The band gap energy of the optimum immobilized composite TiO2/PANI/ENR/PVC (1:0035) was 2.86eV where polyaniline (PANI) formed a core–shell coating of about 0.9nm with a strong TiO2–PANI interaction. Photo-etching of the immobilized TiO2/PANI/ENR/PVC (1:0.0035) composite for 7h increased its surface area and improved its photocatalytic activity. TiO2/PANI/ENR/PVC (1:0.0035)-7h was visible light sensitive where 85% of 30mgL−1 reactive red 4 (RR4) dye was decolorized after 60min of irradiation. The immobilized TiO2/PANI/ENR/PVC (1:0.0035)-7h was reusable and its photocatalytic activity was sustainable with an average pseudo first order rate constant value of 0.103±0.002min−1. Adding PANI to the immobilized P25 TiO2 has enhanced its photocatalytic activity throughout the entire ten recycled applications due to the increased BET surface area and lower ecb and h+ recombination.
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