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

María Jesús Abeledo-Lameiro, Aurora Reboredo-Fernández, María Inmaculada Polo-López, Pilar Fernandez-Ibanez, Elvira Ares-Mazás, Hipólito Gómez-Couso

Research output: Contribution to journalArticle

10 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 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.
LanguageEnglish
Pages132-138
JournalCatalysis Today
Volume280
Early online date20 Jun 2016
DOIs
Publication statusPublished - 1 Feb 2017

Fingerprint

Disinfection
Propidium
Solar radiation
Coloring Agents
Dyes
Water
Parasites

Keywords

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

Cite this

Abeledo-Lameiro, María Jesús ; Reboredo-Fernández, Aurora ; Polo-López, María Inmaculada ; Fernandez-Ibanez, Pilar ; Ares-Mazás, Elvira ; Gómez-Couso, Hipólito. / Photocatalytic inactivation of the waterborne protozoan parasite Cryptosporidium parvum using TiO2/H2O2 under simulated and natural solar conditions. 2017 ; Vol. 280. pp. 132-138.
@article{cff8ba5d0137428d83aaf80cceb9afa7,
title = "Photocatalytic inactivation of the waterborne protozoan parasite Cryptosporidium parvum using TiO2/H2O2 under simulated and natural solar conditions",
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.",
keywords = "Cryptosporidium, Photocatalytic disinfection, Titanium dioxide, Hydrogen peroxide, Simulated solar radiation, Natural sunlight",
author = "Abeledo-Lameiro, {Mar{\'i}a Jes{\'u}s} and Aurora Reboredo-Fern{\'a}ndez and Polo-L{\'o}pez, {Mar{\'i}a Inmaculada} and Pilar Fernandez-Ibanez and Elvira Ares-Maz{\'a}s and Hip{\'o}lito G{\'o}mez-Couso",
year = "2017",
month = "2",
day = "1",
doi = "10.1016/j.cattod.2016.05.046",
language = "English",
volume = "280",
pages = "132--138",

}

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; Gómez-Couso, Hipólito.

Vol. 280, 01.02.2017, p. 132-138.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Photocatalytic inactivation of the waterborne protozoan parasite Cryptosporidium parvum using TiO2/H2O2 under simulated and natural solar conditions

AU - Abeledo-Lameiro, María Jesús

AU - Reboredo-Fernández, Aurora

AU - Polo-López, María Inmaculada

AU - Fernandez-Ibanez, Pilar

AU - Ares-Mazás, Elvira

AU - Gómez-Couso, Hipólito

PY - 2017/2/1

Y1 - 2017/2/1

N2 - 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.

AB - 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.

KW - Cryptosporidium

KW - Photocatalytic disinfection

KW - Titanium dioxide

KW - Hydrogen peroxide

KW - Simulated solar radiation

KW - Natural sunlight

U2 - 10.1016/j.cattod.2016.05.046

DO - 10.1016/j.cattod.2016.05.046

M3 - Article

VL - 280

SP - 132

EP - 138

ER -