Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, USA.
Langmuir. 2010 Feb 16;26(4):2805-10. doi: 10.1021/la902844r.
Composite nanostructured samples of Ag (0.5-20%)/(C, S)-TiO(2) 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)-TiO(2) played a 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)-TiO(2) 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-TiO(2). 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.
Ag(0.5-20%)/(C, S)-TiO(2) 复合纳米结构样品通过 EDX、XRD、FT-IR、UV-vis、BET、XPS 和 ζ 电位测量进行了合成和表征。光催化和杀菌测试表明，（C, S）-TiO(2) 中掺杂银的量（Ag(+））在气相乙醛的光降解以及大肠杆菌细胞和枯草芽孢杆菌孢子的失活中起着至关重要的、独特的作用。非常有趣的是，Ag/(C, S)-TiO(2) 纳米颗粒（晶粒尺寸<10nm）在没有光激活的情况下对大肠杆菌（log 杀灭>8）和枯草芽孢杆菌孢子（log 杀灭>5）表现出非常强的抗菌性能，暴露 30 分钟，与 P25-TiO(2)相比。因此，我们首次证明，掺杂银、碳和硫的二氧化钛（一种环保的光催化剂）可以作为多功能通用杀菌剂以及可见光激活光催化剂。
