F担载TiO2光催化降解甲醛影响因素研究

he nano-TiO2 photocatalytic film was prepared through the sol-gel method, and was loaded on the surface of the active carbon fiber (ACF). The properties of the prepared nano-TiO2 was characterized by XRD and SEM. At last, this material was used to treat the formaldehyde of indoor air, and the influencing factors, including the number of the TiO2 film layers, the initial concentration of the formaldehyde, the relative humidity, the temperature, and the light, were investigated respectively. The result of this experiment showed that: the prepared TiO2 was anatase, and the average size of those crystals is about 20nm; the material with 3 film layers had the best degradation efficiency; the degradation efficiency decreased as the initial concentration of the formaldehyde increased, and increased as the temperature went up; the degradation efficiency is best when the relative humidity is 48%; and the TiO2 photocatalytic film should be irradiated by light with certain wavelength (λ<387nm) when treating the formaldehyde.