The role of titanium dioxide

The role of titanium dioxide can be divided into two types: Edible titanium dioxide, commonly known as white pigment, is the abbreviation of food-grade titanium dioxide. Used as a colorant and food whitening agent, it is non-toxic, odorless, white powder, sometimes in liquid form, easy to disperse, and widely used in the pharmaceutical, food and cosmetics industries. Nano titanium dioxide, as an efficient, non-toxic photocatalyst, has received increasing attention and attention in the field of environmental protection. Its functions include gas purification of organic sewage, antibacterial and deodorization treatment, and anti-fog self-cleaning function.

1. Gas purification

Environmental harmful gases can be divided into indoor harmful gases and atmospheric pollutants. The main indoor harmful gases include formaldehyde released by decorative materials and methyl mercaptan, hydrogen sulfide and ammonia produced in the living environment. TiO can decompose and oxidize these substances adsorbed on its surface through photocatalysis, thereby reducing the concentration of these substances in the air and alleviating or eliminating environmental discomfort. Air pollutants are mainly nitrogen oxides and sulfur oxides brought by automobile exhaust and industrial waste gas. The gases are oxidized into steam using the catalytic effect of nano-TiO

2. The compressed sulfuric acid and nitric acid are removed during rainfall, thereby achieving the goal of reducing air pollution. Coating TiO photocatalytic film on the surface of building materials such as window glass and ceramics in rooms and offices or placing TiO photocatalytic equipment in the room can effectively degrade pollutants and purify indoor air.

An anti-peeling photocatalytic sheet developed using nano-TiO can effectively remove NO gas from the air using sunlight, and the HN0 generated on the surface of the sheet can be washed away by rainwater, ensuring the stability of the catalyst activity.

3. Antibacterial and deodorizing

Antibacterial refers to the inhibitory or killing effect of nano-TiO on microorganisms in the environment under light. TiO photocatalyst 22 has a strong bactericidal ability against Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus, etc. When bacteria are adsorbed on the surface of photocatalytic ceramics coated with nano-titanium dioxide, the active superoxide ion free radicals (?O) and hydroxyl free radicals (?OH) produced by TiO2 excited by ultraviolet light can penetrate the cell wall of bacteria and destroy the cell membrane.

It enters the bacteria, blocks the transmission of film-forming substances, and blocks its respiratory system and electron transport system, thereby effectively killing the bacteria and inhibiting the bacteria from decomposing organic matter to produce odorous substances (such as HS, SO, thiols, etc.).