For the inactivation of mold spores by UVC irradiation, with ozone acting as a promoter, TiO2 nanoparticles may act better as a "sun block" than as a photocatalytic disinfectant.

摘要: Fungal spores are known as critical indoor allergens, and air purification techniques including photocatalytic disinfection using titanium dioxide (TiO2), ultraviolet germicidal irradiation (UVGI) ozonation, have been considerably investigated. However, most of the research is in regard to disinfection, focused on anti-bacterial efficacy TiO2 nanoparticles (NPs). Furthermore, some even showed that antifungal NPs may not be significant. Thus, investigating reasons behind non-significant enhancing indispensable. In this study, ozone was employed improve nano-metal supported NPs. The commercial (Degussa (Evonik) P25) served a good support, incipient wetness impregnation successfully exploited prepare oxidized nano-metals (Ag, Cu Ni) study. There were two surfaces (quartz putty) used inactivation experiments Aspergillus niger which manipulated under conditions: exposed (UVC) light , UVC simultaneously. SEM images demonstrated sheltered from microcracks between agglomerates. When irradiating with UVC, A. testing surfaces, without NPs, inactivated faster than those implying “sun block” effect material lower UVGI. On both rate constants (k) simultaneously (on quartz: k = 2.09–6.94 h−1, putty: 3.17–6.66 h−1) better only 1.80–5.89 h−1; 2.97–3.98 h−1), indicating can enhance UVGI efficacy.