Photocatalytic Antimicrobial Coating TiO2 Nanoparticles

    Titanium dioxide (TiO2) possesses antibacterial functions by its photocatalytic properties which can destroy bacteria or suppress their reproduction. TiO2 also has the function of improving the mechanical properties through particle dispersion strengthening.

    Some of the photocatalytic properties of nanomaterials can be developed into nanometer photocatalytic coating. In our experiment, we use HWNANO TiO2 nanoparticles after the special surface treatment, which mix with the pure acrylic resin coating, and the relevant unit test showed that it has obvious catalytic degradation to the nitrogen oxides, grease and formaldehyde material. For nitrogen oxide degradation efficiency can reach 80%. 

    At present it is generally believed photocatalytic degradation mechanism is as follows:

    Titanium dioxide has three different crystal phase structure: Anatase type (Anatase), Brookite and Rutile type (Rutile). Anatase titanium dioxide has high photocatalytic oxidation ability, its forbidden band width for Eg = 3.2 eV, equivalent to a wavelength of 387 NRN light energy, it is just in the ultraviolet region, so in TiO2 photocatalytic oxidation reaction need to uv light source, such as sun light, halogen tungsten dean, mercury lamp light. Under ultraviolet light its valence band with electron is emitted to the conduction band, and on the valence band produce holes. the process is that under uv irradiation, TiO2 produce a free electron, They make the oxygen in the air activation and produces active oxygen and free radicals.

    Reactive oxygen species and OH radicals have high reactivity, when pollutants adsorption on the surface, it will combine with free electrons and The produce redox reaction.So as to achieve the aim of eliminating pollution.

    for Photocatalytic anatase TIO2 nanoparticles, pls contact us at hwnano@xuzhounano.com.