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Photocatalytic Activities of HZSM-5 Supported TiO2 in Different Electrolyte Solutions

Zeolite HZSM-5 was pre-treated by oxalic acid and used as support for TiO2 prepared by sol-gel method. Photocatalytic activities of the supported TiO2 on HZSM-5 were investigated with existence of three kinds of electrolytes, ie. NaCl, NaHCO3 and NH4C. The use of these electrolytes encountered very similar influences on adsorption and photocatalytic degradation on HZSM-5 supported TiO2. Methyl orange total decoloration and photocatalytic degradation rates increased with electrolyte concentration when the concentration was lower than 0.1 mol/l. Adsorption of methyl orange of the photocatalyst went up constantly as electrolyte concentration rising from 0 to 1.0 mol/l. Photocatalytic degradation efficiencies undertook a slowly decrease at a long range of electrolyte concentration.