TITANIA PHOTOCATALYST AND PREPARATION METHOD THEREOF

摘要

PURPOSE: Provided is a titania photocatalyst which has smaller particle diameter than the conventional titania powder and enhanced photo-activity. The photocatalyst is homogeneously dispersed in the zeolite carrier and does not coagulate so that quantum efficiency of the titania powder in the UV region is maximized, making rapid and effective elimination of various harmful gases such as ammonia in the air and sulfur compounds together with organic compounds in the water by the photocatalytic oxidation. CONSTITUTION: The photocatalyst preparation comprises: the first process wherein titanium tetraisopropoxide is dissolved completely in isopropyl alcohol and adding and dissolving each 0.5-2moles of citric acid and 0.5-10 moles of ethylene glycol to 1 mole of titanium tetraisopropoxide ; the second process of adding and mixing with the above mixed solution, zeolite selected from H-type ZSM-5, USY, BEA, KL zeolite containing 20-200moles of silica; and the third process wherein the above titania/zeolite mixture is distilled at 80-100°C under pressure, irradiated with microwave and calcined. The above titania powder carried on the zeolite has the particle diameter of 5-2 nm and its quantum efficiency is 50-80% per unit photocatalyst while its UV-DRS spectrum is in the region of 370-310 nm.