PHOTOCATALYTIC DEGRADATION OF TOLUENE IN WASTEWATER BY SUSPENDED AND DIPPING COATED TITANIUM DIOXIDE INCORPORATING WITH SURFACTANT
Keywords:
Photocatalytic, TiO, toluene, wastewater, surfactantAbstract
The toluene degradation in synthetic wastewater was performed by liquid-solidphotocatalytic process using titanium dioxide (anatase phase) as the catalyst under UVirradiation and flowing oxygen gas. Two different systems of titania catalyst; suspensionand dipping coated titanium dioxide catalysts containing 0.1-1.0 mM of sodiumdodecylsulfate (SDS) surfactant, were carried out. The mixture was irradiated with UVlamp at 27 ± 1ºC and toluene concentration was analyzed by HPLC. The toluene degradation coefficients (C/C0) of 250 mL, 100 mg.L-1 toluene solution catalyzed by suspensiontitania and that containing dipping coated titania catalyst were compared. The toluenedegradation catalyzed by 0.5 mg.L-1 suspension titania catalyst containing 0.6 mMsurfactant was complete within 60 min, whereas the optimum of the toluene degradationcoefficient for the dipping coated titania system containing 1.0 mM surfactant was 0.20 at60 min. However, the maximum toluene degradation based on specific activity of thedipping coated titania with 1.0 mM SDS was 1,000 mg.g-1 titania, higher than that of thesuspended titania which was 200 mg.g-1. Furthermore, the toluene degradation by thedipping coated titania is cost saving and convenient to be reused.
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