Photocatalytic inactivation of the waterborne protozoan parasite Cryptosporidium parvum using TiO2/H2O2 under simulated and natural solar conditions

M.J. Abeledo-Lameiro, A. Reboredo-Fernández, M.I. Polo-López, P. Fernández-Ibáñez, E. Ares-Mazás, H. Gómez-Couso

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18 Citations (Scopus)

Abstract

This is the first study that evaluates the efficacy of the photocatalytic disinfection against the waterborne protozoan parasite Cryptosporidium using a combination of TiO2 and H2O2 under simulated and natural solar conditions. Samples of distilled water containing 100 mg/L of TiO2 and/or 50 mg/L of H2O2 were spiked with purified Cryptosporidium parvum oocysts and exposed to solar radiation for 5 h. The oocyst global viability was determined by inclusion/exclusion of the fluorogenic vital dye propidium iodide. A strong decrease in the oocyst global viability was observed in samples containing TiO2 and TiO2/H2O2 under simulated solar conditions (4.16 ± 2.35% and 3.82 ± 4.26%, respectively, vs 90.44 ± 5.87%, initial global viability). Similarly, a drastic reduction in the oocyst global viability was observed under real sunlight (2.29 ± 1.99% and 0.92 ± 0.71% in samples containing  TiO2and  TiO2/H2O2 , respectively, vs 99.45 ± 0.95%, initial global viability). These results prove the efficacy of the  TiOphotocatalytic disinfection against C. parvum, decreasing the time needed to reach the oocyst inactivation in comparison with exclusive solar disinfection. However, the addition of H2O2  at low concentrations (50 mg/L) did not enhance the TiO2  photocatalytic process against Cryptosporidium.
Original languageEnglish
Pages (from-to)132-138
Number of pages7
JournalCatalysis Today
Volume280
Issue numberPart 1
Early online date20 Jun 2016
DOIs
Publication statusPublished - 1 Feb 2017

Keywords

  • Cryptosporidium
  • Photocatalytic disinfection
  • Titanium dioxide
  • Hydrogen peroxide
  • Simulated solar radiation
  • Natural sunlight

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