Bactericidal activities and synergistic effects of Ag-TiO₂ and Ag-TiO₂-SiO₂ nanomaterials under UV-C and dark conditions
by Nhung Thi-Tuyet Hoang; Nguyen Van Suc; The-Vinh Nguyen
International Journal of Nanotechnology (IJNT), Vol. 12, No. 5/6/7, 2015

Abstract: The synergistic effects of silver and titanium dioxide revealed the potential utility of Ag-TiO₂-based materials as safe disinfectants in drinking water treatment. In this work, disinfection of Escherichia coli bacteria (ATCC®25922) by using impregnation-derived Ag-P25 and gel-derived Ag-TiO₂-SiO₂ nanomaterials was conducted under both UV-C exposure and dark conditions to elucidate their synergistic effects. Under UV-C irradiation, the bactericidal activity of impregnation-derived Ag-P25 was superior to the one observed with only UV-C, a combination of AgNO₃ and UV-C, or a combination of TiO₂ and UV-C. Meanwhile, the bactericidal activities of the Ag-P25 nanoparticles in dark were quite lower than those under UV-C light, but higher than that of bare TiO₂(P25) or AgNO₃in dark conditions. The results also proved that synergistic effect of the gel-derived Ag-TiO₂-SiO₂ nanomaterial made bactericidal activities stronger than those of the Ag-P25 counterpart under both UV-C light and dark conditions. This could be ascribed to the small particle size of gel-derived Ag-TiO₂-SiO₂ (ca. 9 nm) when compared with that of impregnation-derived Ag-P25 (ca. 21 nm).

Online publication date: Sun, 08-Mar-2015

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