title: Photoelectrocatalytic inactivation of fecal coliform bacteria in urban wastewater using nanoparticulated films of TiO2and TiO2/Ag.
abstract: Photocatalysis has shown the ability to inactivate a wide range of harmful microorganisms with traditional use of chlorination. Photocatalysis combined with applied bias potential (photoelectrocatalysis) increases the efficiency of photocatalysis and decreases the charge recombination. This work examines the inactivation of fecal coliform bacteria present in real urban wastewater by photoelectrocatalysis using nanoparticulated films of TiO2and TiO2/Ag (4%w/w) under UV light irradiation. The catalysts were prepared with different thicknesses by the sol-gel method and calcined at 400°C and 600°C. The urban wastewater samples were collected from the sedimentation tank effluent of the university sewage treatment facility. The rate of bacteria inactivation increases with increasing the applied potential and film thicknesses; also, the presence of silver on the catalyst surface annealed at 400°C shows better inactivation than that at 600°C. Finally, a structural cell damage of Escherichia coli (DH5α), inoculated in water, is observed during the photoelectrocatalytic process.
authors.affiliation: a Posgrado en Ingeniería y Ciencias Aplicadas , Universidad Autónoma del Estado de Morelos , Cuernavaca , México.
authors.forename: Ruth Belinda
authors.initials: RB
authors.lastname: Domínguez-Espíndola
authors.affiliation: b School of Biosciences , Birmingham University , Birmingham , UK.
authors.forename: Jeet C
authors.initials: JC
authors.lastname: Varia
authors.affiliation: c Centro de Investigaciones en Ingeniería y Ciencias Aplicadas , Universidad Autónoma del Estado de Morelos , Cuernavaca , México.
authors.forename: Alberto
authors.initials: A
authors.lastname: Álvarez-Gallegos
authors.affiliation: d Centro de Investigación en Biotecnología , Universidad Autónoma del Estado de Morelos , Cuernavaca , México.
authors.forename: Ma Laura
authors.initials: ML
authors.lastname: Ortiz-Hernández
authors.affiliation: d Centro de Investigación en Biotecnología , Universidad Autónoma del Estado de Morelos , Cuernavaca , México.
authors.forename: Justina Leticia
authors.initials: JL
authors.lastname: Peña-Camacho
authors.affiliation: c Centro de Investigaciones en Ingeniería y Ciencias Aplicadas , Universidad Autónoma del Estado de Morelos , Cuernavaca , México.
authors.forename: Susana
authors.initials: S
authors.lastname: Silva-Martínez
mesh_terms: D002384:Catalysis; D002473:Cell Wall / Q000187:drug effects / Q000528:radiation effects / Q000648:ultrastructure; D002947:Cities; D055664:Electrochemical Techniques; D004755:Enterobacteriaceae / Q000187:drug effects / Q000528:radiation effects / Q000648:ultrastructure; D005243:Feces / Q000382:microbiology; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000528:radiation effects / Q000633:toxicity / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D012834:Silver / Q000737:chemistry* / Q000633:toxicity; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects / Q000633:toxicity; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater; D014873:Water Pollutants / Q000737:chemistry / Q000528:radiation effects
chemical_list: D012834:Silver; D014025:Titanium; D062065:Wastewater; D014873:Water Pollutants; C009495:titanium dioxide
keywords: Fecal; TiO2; TiO2/Ag; photoelectrocatalysis; wastewater