Preparation of TiO2 and HZSM-5 Mixture and Methyl Orange Degradation Activity

HZSM-5 zeolite was prepared by modification of NaZSM-5 with NH4Cl and was used as support for TiO2. Maximum decoloration rates appeared when using 200 mg/l TiO2 in both photocatalysts. At TiO2 concentration below 130 mg/l, pure TiO2 could degrade more methyl orange molecules in the solution than using mixture of TiO2 and HZSM-5. At even higher photocatalyst concentrations, the mixture performed better decoloration activity than using pure TiO2. After 70 mm of irradiation, nearly all of the initial methyl orange was degraded on the two photocatalysts. When using mixed photocatalysts prepared by solid state dispersion, adsorption of methyl orange was nearly constant in all the HZSM-5 using amount, which was not more than 3% of the initial methyl orange. Decoloration of methyl orange increased constantly with increasing HZSM-5 doping amount.