Solar photocatalysis: A green technology for E. coli contaminated water disinfection. Effect of concentration and different types of suspended catalyst

Sihem Helali, Maria Inmaculada Polo-López, P Fernandez Ibanez, Bunsho Ohtani, Fumiaki Amano, Sixto Malato, Chantal Guillard

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Photocatalytic and photolytic disinfection of Escherichia coli in water was studied under natural sunlight using different types of photocatalyst (TiO2 P-25, PC500, Ruana and Bi2 WO6 ) at different concentrations. The solar photo-inactivation yielded complete inactivation results, which varied with the solar light intensity. Meanwhile, dark control samples in the lab (temperature constant at 25 ◦ C) remained at con- stant concentration and dark samples outside laboratory showed a decrease due to the mild solar heating occurred during the experiments.The adding of any kind of photo-catalyst to the water accelerated the bactericidal action of solar irradiation and led to complete disinfection (until detection limit). The photocatalytic disinfection efficiency was not enhanced by the increase of catalyst concentration above 0.5g/L for P-25, PC500 and Bi2WO6, where about 106 CFU/mL were completely inactivated within 5 min, 30 min and more than 150 min of solar exposure under clear sky, respectively. An increase of the concentration to 1 g/L slightly decreased the total inactivation time. Rutile (Ruana) catalyst behaves differently, optimal concentration was lower than for the other titania materials; agglomeration of particles occurred as the concentration of catalyst increases. Durability of photocatalytic treatment and chemicals analyses of inorganic anions and cations have also been investigated.
LanguageEnglish
Pages31-40
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume276
Early online date1 Dec 2013
DOIs
Publication statusE-pub ahead of print - 1 Dec 2013

Fingerprint

Environmental technology
Photocatalysis
Disinfection
Escherichia coli
catalysts
Catalysts
Water
deactivation
water
Inorganic Chemicals
Solar heating
solar heating
Photocatalysts
Anions
Cations
sunlight
Escherichia
agglomeration
Durability
durability

Keywords

  • E. coli
  • Solar Disinfection
  • Photocatalysis
  • Bacterial inactivation

Cite this

Helali, Sihem ; Polo-López, Maria Inmaculada ; Fernandez Ibanez, P ; Ohtani, Bunsho ; Amano, Fumiaki ; Malato, Sixto ; Guillard, Chantal. / Solar photocatalysis: A green technology for E. coli contaminated water disinfection. Effect of concentration and different types of suspended catalyst. 2013 ; Vol. 276. pp. 31-40.
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Solar photocatalysis: A green technology for E. coli contaminated water disinfection. Effect of concentration and different types of suspended catalyst. / Helali, Sihem; Polo-López, Maria Inmaculada; Fernandez Ibanez, P; Ohtani, Bunsho; Amano, Fumiaki; Malato, Sixto; Guillard, Chantal.

Vol. 276, 01.12.2013, p. 31-40.

Research output: Contribution to journalArticle

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AU - Helali, Sihem

AU - Polo-López, Maria Inmaculada

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AU - Ohtani, Bunsho

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