Titanium dioxide is an important white pigment and porcelain glaze. Used in paint, ink, plastic, rubber, paper, chemical fiber, watercolor pigments and other industries. Titanium dioxide used as pigment in the world is more than hundreds of thousands of tons a year. Titanium dioxide can be added to paper to make the paper white and opaque, so it is necessary to add titanium dioxide to banknote paper and art paper.

In order to make the color of the plastic lighter and make the rayon luster soft, titanium dioxide is sometimes added.

In the rubber industry, titanium dioxide is also used as a filler for white rubber.

Ultrafine titanium dioxide has excellent UV shielding and transparency. It is widely used in cosmetics, wood protection, food packaging plastics, durable household films, man-made fibers and natural fibers, transparent coatings. Because of its special optical effect in metallic flash coatings, it has been paid attention to and applied in high-end car paints. A kind of UV shielding film was prepared by adding polylactic acid (POLylactic acid) modified nano titania with polydopamine. Nano-titanium dioxide was added in the preparation of polyurethane microcapsules, and the mechanical properties and thermal stability of the material were improved, and it can effectively shield ultraviolet radiation, and can be used as an exterior wall coating. On the basis of ensuring the biodegradability of the biofilm, titanium dioxide is added to make a packaging material to shield the ultraviolet radiation.

The photochemical properties of semiconductor titanium dioxide have made it useful in many fields, such as the purification of air, water and fluids. Photocatalysts doped with carbon or other heteroatoms can also be used in sealed Spaces or areas with scattered light sources. When used as coatings on buildings, pedestrian slabs, concrete walls or roof tiles, they can significantly increase the breakdown of airborne pollutants such as nitrogen oxides, aromatics and aldehydes.

Titanium dioxide can effectively prevent the arbitrary growth of microorganisms through photocatalysis, thereby reducing the amount of harmful components in the environment. The antibacterial mechanism is that titanium dioxide is activated by light, the interaction between electron hole pairs and oxygen molecules and hydroxide ions, which stimulates free radicals and causes a chain reaction, destroying the protein of bacteria and achieving the effect of sterilization.

Titanium dioxide is widely used in the photoanode material of dye-sensitized solar cells, the majority of researchers to titanium dioxide as a prototype, the hydrothermal method, electrospinning method and other methods to modify it, while using metal substances, inorganic substances and other doping reaction to prepare excellent performance of the photoanode, in order to assemble into dye-sensitized solar cells.