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AWWA WQTC69251
- Virus Inactivation by Silver Doped Titanium Dioxide Nanoparticles
- Conference Proceeding by American Water Works Association, 11/01/2008
- Publisher: AWWA
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Silver doped TiO<sub>2</sub> nanoparticles (Ag/TiO<sub>2</sub>) were synthesized by the photochemicalreduction of silver nitrate with oxalic acid and ultraviolet (UV) radiation in the presence of TiO<sub>2</sub> (Degussa P-25). Inactivation of Bacteriophage MS-2 by the Ag/TiO<sub>2</sub> nanoparticles, the parent TiO<sub>2</sub> material,and silver nanoparticles (nAg) were assessed in small batch systems subjected to UV-Aradiation. The viral suspensions were assayed via the double agar layer method. The resultsobtained with silver doped TiO<sub>2</sub> were compared with those obtained with TiO<sub>2</sub> alone, nAg alone,and UV-A alone to determine if the presence of Ag enhances viral inactivation by TiO<sub>2</sub> and if asynergism exists between the antiviral activity of nAg and that of TiO<sub>2</sub>. Chick's law was used tomodel the inactivation kinetics. Ag/TiO<sub>2</sub> initially inactivated MS-2 faster than bare TiO<sub>2</sub>, with arate constant of 0.17 s<sup>-1</sup> vs. 0.12 s<sup>-1</sup>, respectively. However, a tailing effect was observed withthe Ag/TiO<sub>2</sub>, and the inactivation rate slowed after 20 s of irradiation, corresponding toapproximately 3.5 LOG removal. nAg alone and UV-A alone were not found to significantlyinactivate MS-2, supporting the hypothesis that a synergism occurs between nAg and TiO<sub>2</sub> whencombined. The understanding of the inactivation mechanisms will be used for the developmentof highly efficient Ag/TiO<sub>2</sub> materials for virus inactivation. Includes 22 references, figures.
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