title: [Application of nano-sized TiO2 photocatalysis to air purification and sterilization].
abstract: OBJECTIVE
  To develop and evaluate the efficiency of air purification and sterilization instrument based on nano-sized TiO(2) photocatalytic technique.
  
  
  METHODS
  The 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.
  
  
  RESULTS
  The 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).
  
  
  CONCLUSIONS
  The 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.
authors.affiliation: 101 Institute, Ministry of Civil Affairs, Beijing 100070, China.
authors.forename: Bing-jie
authors.initials: BJ
authors.lastname: Li
authors.forename: De-hui
authors.initials: DH
authors.lastname: Yang
authors.forename: Shuai-qin
authors.initials: SQ
authors.lastname: Wu
authors.forename: Bo-sen
authors.initials: BS
authors.lastname: Li
authors.forename: Hao
authors.initials: H
authors.lastname: Meng
authors.forename: Si-peng
authors.initials: SP
authors.lastname: Jiang
authors.forename: Guo-jun
authors.initials: GJ
authors.lastname: Liu
authors.forename: Yue-hui
authors.initials: YH
authors.lastname: Zhao
authors.forename: Hong-bo
authors.initials: HB
authors.lastname: Cui
authors.forename: Xue-mei
authors.initials: XM
authors.lastname: Zhou
authors.forename: Zhao-hua
authors.initials: ZH
authors.lastname: Zhong
mesh_terms: D000397:Air Pollution / Q000517:prevention & control*; D003666:Decontamination / Q000379:methods*; D004203:Disinfection / Q000379:methods*; D049329:Nanostructures; D010777:Photochemistry; D014025:Titanium
chemical_list: C009495:titanium dioxide; D014025:Titanium