Abstract: It is the object of the present invention to provide utensils for table use or cooking use, which can easily improve the taste of food and drink and make them tasty without using particular energy in a short time. The utensils for table use or cooking use according to the present invention have their surface coated with a film of titanium oxide; when they are exposed to sunrays, an electric light or the like, electrons and positive holes are formed on the film of titanium oxide on the surface thereof according to photocatalytic reaction, whose strong oxidation-reaction decomposes residual chlorine and organic compounds dissolved in water to remove the odor of chlorine and the odor of mold and makes clusters of water in food and drink small to improve the taste of food and drink and to make them tasty.

Abstract: The present invention aims at providing an economical process for purifying water which can produce clean water by treating polluted water, which contains agricultural chemicals, organic solvents (particularly, halocarbon) and surface active agents (particularly, those with side chains) which are hard to treat according to a conventional activated sludge process, under moderate conditions readily and promptly, and also, which process is characterized by adding titanium oxide and iron salt into water to be treated, and irradiating light thereupon.

Abstract: The present invention aims at providing an economical process for purifying water which can produce clean water by treating polluted water, which contains agricultural chemicals, organic solvents (particularly, halocarbon) and surface active agents (particularly, those with side chains) which are hard to treat according to a conventional activated sludge process, under moderate conditions readily and promptly, and also, which process is characterized by adding titanium oxide and iron salt into water to be treated, and irradiating light thereupon.