Photocatalytic disinfection of Giardia intestinalis and Acanthamoeba castellani cysts in water

Soekmen M., DEĞERLİ S., Aslan A.

EXPERIMENTAL PARASITOLOGY, cilt.119, sa.1, ss.44-48, 2008 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 119 Sayı: 1
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1016/j.exppara.2007.12.014
  • Dergi Adı: EXPERIMENTAL PARASITOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.44-48
  • Anahtar Kelimeler: Giardia intestinalis, Acanthamoeba castellani, titanium dioxide photocatalysis, photocatalytic disinfection, TiO2, silver loaded TiO2, CRYPTOSPORIDIUM-PARVUM OOCYSTS, DRINKING-WATER, MURIS CYSTS, SOLAR DISINFECTION, UV IRRADIATION, LAMBLIA CYSTS, INACTIVATION, TIO2, MICROBES, EFFICACY
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

In this study, disinfection of water containing Giardia intestinalis and Acanthamoeba castellani cysts with TiO2 and modified catalyst silver loaded TiO2 (Ag-TiO2) was investigated. Destruction of the parasites was evaluated after UV illumination of the suspension consisting 5 x 10(8)-13.5 x 10(8) cysts/mL in the presence of 2 g/L neat or modified TiO2 at neutral pH. In the initial stage, the solid photocatalyst particles penetrated the cyst wall and then oxidant species produced by TiO2/UV destroyed both cell wall and intracellular structure. In the case of G. intestinalis inactivation (disinfection) performance of TiO2/UV system reached 52.5% only after 25 min illumination and total parasite disinfection was achieved after 30 min illumination. However, silver loaded TiO2 seemed to be more effective as this loading provided better catalytic action as well as additional antimicrobial properties. Cell viability tests showed that parasite cysts, their walls in particular, were irreversibly damaged and cysts did not re-grow. Nevertheless the studied system seemed to be ineffective for the inactivation of A. castellani. Inactivation percentages of TiO2/UV and Ag-TiO2/UV systems were far lower than that of UV alone, being 50.1% and 46.1%, respectively. (C) 2008 Elsevier Inc. All rights reserved.