NDLI: 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.

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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.

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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.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Gong, Jia-You Chen, Yen-Chi Huang, Yi-Ting Tsai, Ming-Chien Yu, Kuo-Pin
Description	Country affiliation: Taiwan Author Affiliation: Gong JY ( Institute of Environmental and Occupational Health Sciences, National Yang-Ming University, No. 155, Sec. 2, Linong Street, Taipei, 11221, Taiwan. kpyu@ym.edu.tw.)
Abstract	Fungal spores are known as critical indoor allergens, and indoor air purification techniques including photocatalytic disinfection using titanium dioxide (TiO2), ultraviolet germicidal irradiation (UVGI) and ozonation, have been considerably investigated. However, most of the research is in regard to photocatalytic disinfection, focused on the anti-bacterial efficacy of TiO2 nanoparticles (NPs). Furthermore, some research even showed that the photocatalytic antifungal efficacy of TiO2 NPs may not be that significant. Thus, investigating the reasons behind the non-significant antifungal efficacy of TiO2 photocatalytic disinfection and enhancing the antifungal efficacy is indispensable. In this study, ozone was employed to improve the photocatalytic antifungal efficacy of the TiO2 NPs and nano-metal supported on TiO2 NPs. The commercial TiO2 NPs (Degussa (Evonik) P25) served as a good support, and incipient wetness impregnation was successfully exploited to prepare oxidized nano-metals (Ag, Cu and Ni) in this study. There were two surfaces (quartz and putty) used in the inactivation experiments of Aspergillus niger spores which were manipulated under two conditions: exposed to ultraviolet (UVC) light , and exposed to UVC and ozone simultaneously. The SEM images demonstrated that the spores were sheltered from UVC light in the microcracks between TiO2 agglomerates. When irradiating with UVC, the A. niger spores on the two testing surfaces, without TiO2 NPs, were inactivated faster than those with TiO2 NPs, implying a 'sun block' effect of this material and a lower photocatalytic antifungal efficacy than UVGI. On both surfaces, the inactivation rate constants (k) of A. niger spores exposed to UVC and ozone simultaneously (on quartz: k = 2.09-6.94 h(-1), on putty: k = 3.17-6.66 h(-1)) were better than those exposed to only UVC (on quartz: k = 1.80-5.89 h(-1); on putty: k = 2.97-3.98 h(-1)), indicating ozone can enhance the UVGI antifungal efficacy.
File Format	HTM / HTML
ISSN	1474905X
Issue Number	9
Volume Number	13
e-ISSN	14749092
Journal	Photochemical & Photobiological Sciences
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2014-09-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Chemistry Discipline Biology Metal Nanoparticles Chemistry Ozone Sunscreening Agents Titanium Ultraviolet Rays Antifungal Agents Pharmacology Aspergillus Niger Physiology Catalysis Toxicity Spores, Fungal Drug Effects Radiation Effects Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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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.

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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.