Preparation of photocatalytic thin film and water-treatment apparatus using thereof

摘要

PURPOSE: A method for preparation of a photocatalyst thin film with high activity and strong adherence on substrate, and a water treatment apparatus using the photocatalyst thin film are provided to sterilize germs and oxidize recalcitrant toxic compounds such as agricultural chemicals and trihalomethane in wastewater/sewage. CONSTITUTION: The method for preparation of a photocatalyst thin film with high activity and strong adherence on substrate includes the steps of (a) mixing 1 to 50 wt.% of titanium-based inorganic binder, 0.1 to 30 wt.% of organic solvent and 0.01 to 5 wt.% of inorganic acid, followed by agitation for 0.1 to 10 hrs; (b) mixing 1 to 30 wt.% of organic polymer and 5 to 50 wt.% of organic solvent; (c) mixing a resultant from the first step with a resultant from the second step, followed by agitation for 0.5 to 10 hrs; (d) adding 1 to 30 wt.% of chelator, 0.001 to 5 wt.% of surfactant and 0.1 to 10 wt.% of photocatalyst powder to the resultant from the third step, followed by ultrasonication for 0.1 to 10 hrs to prepare a photocatalyst sol; (e) coating the photocatalyst sol on a substrate by dip coating or spray coating method; (f) drying the coated substrate at 50 to 450 deg.C for 0.1 to 50 hrs; and (g) heat treating the dried substrate at 120 to 650 deg.C for 0.1 to 50 hrs. The photoreactor comprises a hollow quartz tube (14) on the outer surface of which photocatalyst thin film is formed; an ultraviolet lamp (10) which is installed inside the hollow quartz tube to generate light; a socket (8) which supplies electric current to the ultraviolet lamp.