Performance of Ag-TiO2Photocatalysts towards the Photocatalytic Disinfection of Water under Interior-Lighting and Solar-Simulated Light Irradiations | Zendy

Camilo A. Castro | Zendy; A. Jiménez Jurado | Zendy; Diana Sissa | Zendy; Sonia A. Giraldo | Zendy

Open Access

Performance of Ag-TiO₂Photocatalysts towards the Photocatalytic Disinfection of Water under Interior-Lighting and Solar-Simulated Light Irradiations

Author(s) -

Camilo A. Castro,

A. Jiménez Jurado,

Diana Sissa,

Sonia A. Giraldo

Publication year - 2011

Publication title -

international journal of photoenergy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.426

H-Index - 51

eISSN - 1687-529X

pISSN - 1110-662X

DOI - 10.1155/2012/261045

Subject(s) - brookite , photocatalysis , anatase , materials science , x ray photoelectron spectroscopy , singlet oxygen , visible spectrum , photochemistry , hydrothermal circulation , irradiation , sorption , chemical engineering , absorption (acoustics) , oxygen , adsorption , chemistry , catalysis , optoelectronics , composite material , organic chemistry , physics , nuclear physics , engineering

This paper reports the characterization and photoactivity of Ag-TiO2 materials using different amounts of silver during the hydrothermal synthesis. Photocatalysts were characterized by means of TEM, XPS, XRD, DRS, and N2 sorption isotherms to determine the textural properties. The photocatalyst's configuration was observed to be as anatase-brookite mixed phase particles with Ag partially oxidized aggregates on the TiO2 surface, which increased visible light absorption of the material. Moreover, photoproduction of singlet oxygen was followed by EPR analysis under visible light irradiations following the formation of TEMPOL. Such photoproduction was totally decreased by using the singlet oxygen scavenger DABCO. Photocatalysts were tested towards the photocatalytic disinfection of water suing a solar light simulator and an interior-light irradiation setup. Results evidenced an increase in the photooxidative effect of TiO2, while dark processes evidenced that part of the inactivation process is due to the Ag-TiO2 surface bactericidal effect and possible lixiviated Ag+

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