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pp.699-709
This study aimed at improving the TiO2 photocatalytic degradation of HA. ·In this study, the Degradation of Humic Acid using Jeju Scoria Coated with WO3/TiO2 in the presence of UV irradiation was investigated as a function of different experimental condition : photocatalyst dosage, Ca2+ and HCO3- addition and pH of the solution. Photodegradation efficiency increased with increasing photocatalyst dosage, the optimum catalyst dosage is 2.5 g/L and Photodegradation efficiency is maximized to WO3/TiO2=3/7. This indicates that WO3 retains a much higher Lewis surface acidity than TiO2, and WO3 has a higher affinity for chemical species having unpaired electrons. The addtion of cation(Ca2+) in water increased the photodegradaion efficiency. But the addtion of HCO3- ion in water decreased a photodegradation efficiency. Photodegradation efficiency increased with decreasing pH. At pH < pzc, the electrostatic repulsion between the HA and the surface of TiO2 decreased.
