Visible light photo-and bioactivity of Ag/TiO sub(2) nanocomposite with various silver contents

Ag/TiO sub(2) nanocomposite with various silver contents was synthesized by combination of sol-gel and the novel arc discharge methods in liquid. The Ag/TiO sub(2) nanoparticles were characterized by X-Ray diffraction (XRD), Brunauer Emmett Teller (BET), transmission electron microscope (TEM) and ul...

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Bibliographic Details
Published in:Current applied physics 2011-07, Vol.11 (4), p.1048-1055
Main Authors: Ashkarran, Ali Akbar, Aghigh, Seyed Mahyad, kavianipour, Mona, Farahani, Neda Jalali
Format: Article
Language:English
Subjects:
Bacteria
Inactivation
Light irradiation
Nanoparticles
Nanostructure
Photocatalysis
Silver
Titanium dioxide
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Summary:Ag/TiO sub(2) nanocomposite with various silver contents was synthesized by combination of sol-gel and the novel arc discharge methods in liquid. The Ag/TiO sub(2) nanoparticles were characterized by X-Ray diffraction (XRD), Brunauer Emmett Teller (BET), transmission electron microscope (TEM) and ultra violet-visible absorption spectroscopy (UV-Vis). The visible light antibacterial activities and photocatalytic properties were successfully demonstrated for the inactivation of Escherichia coli (E-coli) bacteria and Rhodamine B (Rh. B). The results revealed that the Ag/TiO sub(2) nanoparticles extended the light absorption spectrum toward the visible region and significantly enhanced the inactivation of E-coli bacteria under visible light irradiation. 0.15 gr Ag/TiO sub(2) nanoparticles revealed best antibacterial activity while 0.05 gr Ag/TiO sub(2) nanoparticles exhibited highest photocatalytic efficiency. The significant enhancement in the photocatalytic activity and antibacterial properties of Ag/TiO sub(2) nanoparticles under visible light irradiation can be ascribed to the effect of noble metal Ag by acting as electron traps in TiO sub(2) band gap. A mechanism for photocatalytic degradation of organic pollutants and antibacterial activity over Ag/TiO sub(2) nanoparticles was proposed based on our observations. Combination of top down and bottom up methods for synthesis of Ag-doped TiO sub(2) visible photocatalyst. Ag-doped TiO sub(2) nanoparticles extended the light absorption spectrum toward the visible region. Inactivation of Escherichia coli bacteria and decomposition of Rhodamine B under visible light irradiation by Ag-doped TiO sub(2) visible photocatalyst. 0.05 gr Ag-doped TiO sub(2) nanoparticles exhibited highest photocatalytic efficiency. 0.15 gr Ag-doped TiO sub(2) nanoparticles revealed highest bactericidal activity.
ISSN:1567-1739
DOI:10.1016/j.cap.2011.01.042