Titanium dioxide, it is a dye and pigment, its molecular formula is TiO2, molecular weight is 79.8658. It is a kind of white inorganic pigment, with non-toxicity, optimal opacity, optimal whiteness and brightness, and it is considered to be the best performance of a kind of white pigment in the world nowadays. Because of its stable physicochemical properties and excellent optical properties and photochemical activity, titanium dioxide has been used in coatings, plastics, rubber, chemical fiber, paper making, ink, cosmetics, capacitors, cutting edge technology of national defense, toys, food, medicine, chemical reagents, electrode, enamel, ceramics, glass, refractory materials, metallurgy, artificial gemstones, fine art pigments, leather, printing and dyeing pastes, soaps, decorative panels, Asphalt bricks, polyester catalyst, photocatalysis, solar cells and other fields have been widely used.