Preparation of N-doped TiO_2 Photocatalytic Paint and Its Sterilization Performance Under Visible-light Irradiation

摘要

A new functional photocatalytic paint was prepared by adding N-doped nanocrystalline anatase TiO_2 powders into self-engineered oxidation resistance latex paint system. The property of the UV-Vis light absorbance of the paint was characterized. The effects of the amount, types, and the introducing methods of the TiO_2 in the paints on the behavior of the UV absorption, photocatalytic properties of the paint were systematically investigated. UV-Vis absorption spectra reveal that the ultraviolet light can strongly be absorbed by the paints. The absorption edge of the N-doped nanocrystalline anatase powders modified paint has red-shifted to visible light region. The colony counting method is used to study its sterilization performance under visible light irradiation. The sterilization experiments show that the rate of sterilizing staphylococcal bacteria by the N-doped TiO_2 modified paint can exceed more than 99% after the paint has been irradiated by the visible light for 2 to 4 hours.