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Unformatted text preview: lass and TiO2/Cs/glass system was examined. Approximately 98.9 % RR4 was effectively removed by TiO2/Cs/glass compared to 33.4 % removed by TiO 2/glass, respectively. The high efficiencies of RR4 photodegradation by TiO2/Cs/glass revealed the importance of adsorption in photocatalysis. The kinetic constants obtained from the Langmuir-Hinshelwood equation at different catalyst loading also showed that thin layer of 0.01 g TiO2 on pH 4 of solution is more favorable. The adsorption of bilayer system was evaluated based on its kinetic (pseuso-first and pseudo-second order rate models) and isotherm (Langmuir and Freundlich models). Adsorption, photocatalysis and sensitization was found to be the mechanism involves in this system. 96 3rd ICYC 2010 Universiti Sains Malaysia ENV-O19 23rd-25th June 2010 PHOTOCATALYTIC DEGRADATION OF REACTIVE RED 4 DYE BY IMMOBILIZED PANI/TIO2 SYSTEM MFS Razak and MA Nawi School of Chemical Sciences, Universiti Sains Malaysia, 11800 Minden, Pulau Pinang, Malaysia E-mail: [email protected] A photocatalyst system involving immobilized TiO2 doped with polyaniline (PANI) on glass plate has been fabricated via a dip-coating method. The dip-coating formulation was prepared by mixing P-25 TiO2 powder with epoxidized natural rubber (ENR) and polyvinylchloride (PVC) blend in toluene and doped by soluble PANI synthesized by emulsion polymerization technique using ammonium persulfate oxidant, sodium dodecylsulfate surfactant and maleic acid as dopant. This composite was characterized by transmission electron microscopy (TEM), thermogravimetric analysis (TGA), Fourier Transform infrared (FTIR), photoluminescence analysis and UV Vis-diffuse reflectance spectroscopy. The photocatalytic activity of immobilized PANI/TIO2 was investigated by the degradation of reactive red 4 (RR4) under low energy fluorescent lamp light source. Factors influencing the activity of this composite such as amount of PANI doping, composite loading, pH, initial dye concentration and different light source have been studied. The results showed that photodegradation process fitted pseudo -first-order k...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.
- Spring '11