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

Abeledo-Lameiro, María Jesús, Reboredo-Fernández, Aurora, Polo-López, María Inmaculada, Fernandez-Ibanez, Pilar, Ares-Mazás, Elvira and Gómez-Couso, Hipólito (2017) Photocatalytic inactivation of the waterborne protozoan parasite Cryptosporidium parvum using TiO2/H2O2 under simulated and natural solar conditions. Catalysis Today, 280 . pp. 132-138. [Journal article]

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URL: http://dx.doi.org/10.1016/j.cattod.2016.05.046

DOI: doi:10.1016/j.cattod.2016.05.046

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 TiO2 and TiO2/H2O2, respectively, vs 99.45 ± 0.95%, initial global viability). These results prove the efficacy of the TiO2 photocatalytic 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.

Item Type:Journal article
Keywords:Cryptosporidium; Photocatalytic disinfection; Titanium dioxide; Hydrogen peroxide; Simulated solar radiation; Natural sunlight
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:36771
Deposited By: Dr Pilar Fernandez-Ibanez
Deposited On:15 Feb 2017 13:34
Last Modified:07 Jun 2017 16:01

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