Methyl Orange Degradation on TiO<sub>2</sub> and Mixture of TiO<sub>2</sub> and HZSM-5 in NaHCO<sub>3</sub> Solution

Abstract

Methyl orange decoloration was conducted in the solution containing NaHCO3. TiO2 and the mixture of TiO2 and HZSM-5 were used as the photocatalysts. The addition of TiO2 greatly changed adsorption of methyl orange in solutions containing different concentration of NaHCO3. The existence of NaHCO3 can improve photocatalytic degradation of the dye under UV irradiation in the solution containing TiO2. As high as 55% decoloration of the dye occurred in the solution containing 1.0 mol/l NaHCO3. When NaHCO3 concentration was lower than 0.08 mol/l, adsorption of the dye was fairly weak on the mixture. At the same time, decoloration of the dye deceased with increasing NaHCO3 concentration. When NaHCO3 concentration was high, adsorption and decoloration of the dye were better at higher NaHCO3 concentration.