Investigation of the antibacterial and photocatalytic properties of the zeolitic nanosized AgBr/TiO 2 composites

Padervand, M ; Sharif University of Technology | 2012

956 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.mssp.2011.08.008
  3. Publisher: 2012
  4. Abstract:
  5. Zeolite-based Ag/AgBr and Ag/AgBr/TiO 2 photocatalysts were prepared by sol-gel and deposition methods and were characterized. Their photocatalytic activities were evaluated by inactivation of Escherichia (E.) coli and the photodegradation of Acid Blue 92 and potassium permanganate. The composites containing Ag/AgBr showed the antibacterial activity in the dark by releasing Ag ions into the medium. The results for inactivation of E. coli indicated that Ag/AgBr/TiO 2 modified photocatalyst had better antibacterial activity than Ag/AgBr/zeolite, while zeolite and TiO 2/zeolite did not show any antibacterial activity under visible light and dark conditions. Photodecolarization rate was affected differently in the presence of H 2O 2 depending upon the illumination source. Under visible light the photodecolorization rate is decreased while with UV light it is increased initially and then decreased by increasing hydrogen peroxide concentration. A mechanism for KMnO 4 photodegradation is proposed. The effects of catalyst concentration, initial dye concentration and temperature were also studied
  6. Keywords:
  7. Azo dye ; E. coli ; Photodegradation ; Sol-gel ; Zeolite ; Anti-bacterial activity ; Catalyst concentration ; Dark conditions ; Deposition methods ; Hydrogen peroxide concentration ; Illumination sources ; Initial dye concentration ; Nano-sized ; Photocatalytic activities ; Photocatalytic property ; Photodecolorization ; Potassium permanganate ; TiO ; Visible light ; Azo dyes ; Hydrogen peroxide ; Photocatalysis ; Sol-gel process ; Titanium dioxide ; Zeolites ; Escherichia coli
  8. Source: Materials Science in Semiconductor Processing ; Volume 15, Issue 1 , February , 2012 , Pages 73-79 ; 13698001 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1369800111001363