Photocatalytic Decomposition of Formaldehyde by Combination of Ozone and AC Network with UV_(254mn), UV_(254nm)4nm and UV_(254+185nm)

摘要

Formaldehyde (HCHO) is one of the most common indoor pollutants. Long time exposure to the environment with HCHO concentration above 0.1mg/m3 can cause harm to human body. In order to remove HCHO efficiently, The TiO2/AC network film was prepared by loading nanometer particle TiO2 on the surface of activated carbon. The photocatalytic degradation of gaseous HCHO was performed by TiO2/AC network film under the irradiation of UV_(365nm), UV_(254nm) and UV_(254+185nm) respectively. The results show that the adsorption of AC network and byproduct ozone (O3) oxidation simultaneously can promote the degradation of the HCHO;; under the illumination of UV_(254+185nm) HCHO can be degraded more effectively. The produced ozone can also be degraded below 0.214 mg/m~3 that are required by Chinese indoor air quality standard.