TiO2 material and the coating methods thereof

The process of producing a titanium dioxide photocatalytic oxidation material, comprising:

• a) forming a titanium dioxide sol with titanium dioxide crystals having crystal size of 3 nm–25 nm and crystallinity greater than 70%;
• b) adding polyethylene glycol as a dispersant to said titanium dioxide sol to form a mixture having a titanium dioxide:
• dispersant ratio of 2:5 to 7:10;
• c) applying microwave treatment on the mixture to crystallize and grow titanium dioxide crystals;
• and
• d) reducing the water content of the mixture to less than 10% w/w while maintaining the crystal size of said titanium dioxide crystals in the 3–25 nm range.

A coating process for coating a photocatalytic oxidation materials comprising

• a) applying 1–10 g of a photocatalytic oxidation material onto each square meter of a substrate, wherein the photocatalytic oxidation material comprises (1) 40±10% w/w titanium dioxide crystals having crystal size of 3 nm–25 nm and crystallinity greater than 70%, (2) at least 50% w/w polyethylene glycol as a dispersant interacting with the titanium dioxide crystals to prevent aggregation thereof such that the crystal size is maintained at 3–25 nm, and (3) 1–10% w/w water, wherein the photocatalytic oxidation material is prepared by a microwave treatment of a mixture of titanium dioxide sol and polyethylene glycol and further comprises surface hydroxyl groups on said titanium dioxide, and wherein 90%–100% of said surface hydroxyl groups are characterized by at least one absorption peak within an infrared spectrum range between 3610–3680 cm−1 when recorded at 150° C.;
• b) spreading said material evenly on said substrate to form a coated substrate;
• and
• c) calcining the coated substrate.