A Multifunctional Biocide/Sporocide and Photocatalyst Based on Titanium Dioxide (TiO2) Codoped with Silver, Carbon, and Sulfur

作者：Hamal Dambar B; Haggstrom Johanna A; Marchin George L; Ikenberry Myles A; Hohn Keith; Klabunde Kenneth J^*

来源：Langmuir, 2010, 26(4): 2805-2810.

DOI：10.1021/la902844r

Composite nanostructured samples of Ag (0.5-20%)/(C, S)-TiO2 were synthesized and characterized by EDX, XRD, FT-IR, UV-vis, BET, XPS, and zeta potential measurements. Photocatalytic and biocidal tests revealed that the amount of the codoped silver (Ag+) in (C, S)-TiO2 playeda crucial, distinctive role in the photodegradation of gas-phase acetaldehyde as well as in the inactivation of Escherichia coli cells and Bacillus subtilis spores. Very interestingly, Ag/(C, S)-TiO2 nanoparticles (crystallite size < 10 nm) have shown very strong antimicrobial properties without light activation against both E. coli (log kill > 8) and B. subtilis spores (log kill > 5) for 30 min exposures, compared with P25-TiO2. Thus, for the first time, we have demonstrated that titanium dioxide (an environmentally friendly photocatalyst) codoped with silver, carbon, and Sulfur can serve as a multifunctional generic biocide as well as a visible light activated photocatalyst.

• 出版日期2010-2-16