Application of nano-sized TiO2 photocatalysis to air purification and sterilization.
- Author:
Bing-jie LI
1
;
De-hui YANG
;
Shuai-qin WU
;
Bo-sen LI
;
Hao MENG
;
Si-peng JIANG
;
Guo-jun LIU
;
Yue-hui ZHAO
;
Hong-bo CUI
;
Xue-mei ZHOU
;
Zhao-hua ZHONG
Author Information
- Publication Type:Journal Article
- MeSH: Air Pollution; prevention & control; Decontamination; methods; Disinfection; methods; Nanostructures; Photochemistry; Titanium
- From: Chinese Journal of Preventive Medicine 2008;42(11):831-835
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo develop and evaluate the efficiency of air purification and sterilization instrument based on nano-sized TiO(2) photocatalytic technique.
METHODSThe nano-sized TiO(2) photocatalytic air purification and sterilization instrument was designed and a sample had been prepared. The sterilization efficiencies for E.coli and Klebsiella by the nano-sized TiO(2) photocatalytic instrument and ultraviolet (UV) were measured in closed labs. The on-site efficiency of the instrument was evaluated, too.
RESULTSThe nano-sized TiO(2) photocatalytic air purification and sterilization instrument was composed of five units: rough filter, nano-sized TiO(2) photocatalytic unit, activated carbon fiber filter, negative ion generator, and programmed control unit. The E.coli killing rates by the nano-sized TiO(2) photocatalytic instrument were 76.0%, 81.8%, 77.5%, and 80.7% at 30, 60, 90, and 120 minutes, respectively. There was no significant difference between the E.coli killing rates of the instrument and UV (P > 0.05), except the 120 minutes timepoint. The Klebsiella killing rates by the instrument were 78.4%, 79.5%, 67.3%, and 58.5% at 30, 60, 90, and 120 minutes, respectively. The Klebsiella killing efficiencies of the instrument at 30 and 60 minutes were better than that of UV (P < 0.01). There was no significant difference between the Klebsiella killing efficiencies of the instrument and UV (P > 0.05).
CONCLUSIONThe air sterilization efficiency of the nano-sized TiO(2) photocatalytic instrument should be equivalent or better as compared with the UV. This instrument might be used for the air purification and sterilization of the public locations.