Abstract: An apparatus for preparing a titanium dioxide (TiO2) sol is provided. The apparatus includes a storage unit configured to store an organic solvent mixture containing an aqueous titanium dioxide sol and a dispersing stabilizer, a separation unit connected to and installed at the storage unit and configured to separate the organic solvent mixture into titanium dioxide particles and an organic solvent mixture containing water and the dispersing stabilizer, a circulating solution transfer path connected and installed between the separation unit and storage unit and configured to transfer the titanium dioxide particles separated by the separation unit to the storage unit, and a discharge unit connected to and installed at one side of the separation unit and configured to discharge an organic solvent mixture containing the water and dispersing stabilizer separated by the separation unit.

Abstract: Disclosed is a photocatalytic coating sol composition and the method for preparing the same. The photocatalityc coating sol composition comprising 0.1% to 20% by weight of a photo-catalyst, 0.1% to 10% by weight of an inorganic adsorbent, 1% to 20% by weight of an inorganic binder, 55% to 95% by weight of an organic solvent and if necessary 0.1% by weight to 10% by weight of a metal compound. Specifically, the present invention can remove harmful substances by coating photocatalytic coating sol composition prepared from photocatalyst, inorganic adsorbent, inorganic binder, metal compound and organic solvent on metal filter such as aluminum etc., and plastic filter such as polyethylene and polypropylene etc. used in environmental contaminants treatment system or air conditioning plant such as air-conditioner and air-cleaner, according to any one of and ordinary coating techniques such as spray method or dipping method etc. at room temperature.