Anatase and rutile are two different crystal forms of titanium dioxide, and they have some important differences in chemical properties and applications. Tio2 rutile typically exhibits high photocatalytic activity due to its open crystal structure, which allows for better adsorption and decomposition of harmful substances. Therefore, it is widely used in fields such as photocatalysts and air purification. The covering power of rutile titanium dioxide is relatively low, and it is usually used in applications that require high photoreactivity, such as photocatalytic coatings in coatings.

Rutile TiO2 has a more stable crystal structure, usually with better chemical stability, UV resistance, and weather resistance, making it more suitable for fields that require higher weather resistance and coverage. Rutile titanium dioxide has excellent optical properties, strong coverage, and stable color, and is widely used in high-end coatings, plastics, and food packaging.

Crystal Structure of Titanium Dioxide

Anatase type titanium dioxide: Anatase belongs to the tetragonal crystal system, in which titanium atoms are located at the center of the unit cell and oxygen atoms are arranged around the titanium atoms. This structure makes the lattice constant of rutile titanium dioxide relatively small and the crystal structure relatively loose. For example, its unit cell parameter a=b=0.3784nm, c = 0.9515nm。

Rutile titanium dioxide: Rutile titanium dioxide is also a tetragonal crystal system, but its crystal structure is more compact. The arrangement of titanium and oxygen atoms is different from that of rutile, and the crystal cell parameter of rutile is a=b=0.4594nm, c = 0.2959nm， Compared to rutile, its atomic packing is tighter and its density is higher.

Chemical Properties of Titanium Dioxide

Stability:

Анатаз диоксид титана: relatively weak chemical stability. Under high temperature conditions, rutile titanium dioxide is prone to undergo crystal transformation, transforming into rutile titanium dioxide. For example, when the temperature reaches 610-915 ℃, the rutile type will gradually transform into the rutile type. This crystal transformation will affect its physical and chemical properties.

Rutile titanium dioxide: It has good chemical stability and can maintain good chemical properties even in harsh environments such as high temperature, strong acid, and strong alkali. It is not prone to crystal transformation and can withstand higher temperatures. Generally, some structural changes only occur above 1000 ℃.

Photocatalytic activity:

Анатаз диоксид титана: has high photocatalytic activity. Under ultraviolet irradiation, rutile titanium dioxide can generate electron hole pairs, thus possessing strong redox ability, which can be used for environmental applications such as photocatalytic degradation of organic pollutants.

Rutile titanium dioxide: relatively low photocatalytic activity. This is because its crystal structure makes the recombination probability of electron hole pairs relatively high, thereby reducing its photocatalytic efficiency.