Biocide Activity of TiO₂ Nanostructured Films

Abstract

Abstract. The ability of nanostructured TiO 2 in anatase phase to eliminate Escherichia coli (E. coli) by UV light irradiation was tested using titania films supported on glass substrates. The films were obtained by electrophoretic deposition of titania sol on sputtered Ti Corning glass substrates. Experimental procedure used to obtain these films and their characterizations are discussed in this paper. Nanostructure nature of the films was analyzed using scanning electron microscopy and atomic force microscopy. Optic microscopy was used to study the photocatalytic activity of films and their interaction with E. coli bacteria, in order to measure the reduction in E. coli colonies. The structure of anatase TiO 2 was determined using grazing incidence X-ray diffraction.

Enhanced Photocatalytic Activity of Hierarchical Macro-Mesoporous Anatase byZrO2Incorporation

“…The semiconductors (CdS, ZnO, WO 3 ) [15] and other metal oxides ZnO, MnO 2 , Al 2 O 3 [16,17], ZrO 2 [18][19][20], Ta 2 O 5 [21], and In 2 O 3 when coupled to TiO 2 nanoparticles have also been shown as efficient in increasing the photocatalytic capability of TiO 2 nanoparticles [22][23][24][25]. The addition of MnO 2 or Al 2 O 3 (charge-transfer catalysts) to TiO 2 nanoparticles broadens the excitation spectrum of TiO 2 to visible light ranges, as demonstrated by methylene blue degradation [22] and E. coli destruction [25].…”