Department of Chemistry, Shahreza Branch, Islamic Azad University, Razi Chemistry Research Centre, 86145-311 Shahreza, Isfahan, Iran.
Department of Chemistry, Shahreza Branch, Islamic Azad University, Razi Chemistry Research Centre, 86145-311 Shahreza, Isfahan, Iran.
J Photochem Photobiol B. 2014 Jan 5;130:132-9. doi: 10.1016/j.jphotobiol.2013.10.018. Epub 2013 Nov 9.
The practical use of visible-light for bactericide treatment has been established by tin oxide nanostructures synthesized using a surfactant-assisted solvothermal method. Anionic (sodium n-dodecyl sulfate, SDS), cationic (cetyltrimethyl ammonium bromide, CTAB) and non-ionic (Tritron X-100) surfactants were used as morphology controlling agents. The as-synthesized nanoparticles are characterized by X-ray powder diffraction (XRD), UV-vis spectroscopy and scanning electron microscopy (SEM). The XRD patterns of the as-synthesized tin oxide nanoparticles were well indexed to the tetragonal rutile structure. Nanostructure tin oxide powders of about 70-92nm in size have been obtained with different morphologies. The spherical, cauliflower, flower petals morphologies of surfactant-mediated SnO2 were obtained using X-100, CTAB, and SDS, respectively and the spherical-like for surfactant-free SnO2 was observed in the SEM micrographs. The surfactant-mediated SnO2 samples showed absorption edges red shift to longer wavelength and increased absorption intensities compared to surfactant-free SnO2. Antibacterial effectiveness of SnO2 samples was tested against general Escherichia coli (E. coli ATCC 25922) under UV-, visible-light and dark conditions. The surfactant promoted antimicrobial effect under visible light by SnO2 band gap modification. In contrast, the surfactant-free SnO2 possessed higher photokilling activity under UV-light. The antibacterial performance of SnO2 samples as a function of their structural and morphological features such as particle size, surface area and visible/UV light absorbing capacity was discussed.
使用表面活性剂辅助溶剂热法合成的氧化锡纳米结构，确立了可见光在杀菌处理方面的实际应用。使用阴离子（十二烷基硫酸钠，SDS）、阳离子（十六烷基三甲基溴化铵，CTAB）和非离子（曲拉通 X-100）表面活性剂作为形态控制剂。所合成的纳米粒子通过 X 射线粉末衍射（XRD）、紫外可见分光光度计和扫描电子显微镜（SEM）进行了表征。所合成的氧化锡纳米粒子的 XRD 图谱很好地符合四方金红石结构。用不同的形态得到了大小约为 70-92nm 的纳米结构氧化锡粉末。用 X-100、CTAB 和 SDS 分别得到了具有球形、菜花和花瓣形态的表面活性剂介导的 SnO2，而在 SEM 显微照片中观察到了无表面活性剂的 SnO2 呈球形。与无表面活性剂的 SnO2 相比，表面活性剂介导的 SnO2 样品的吸收边缘向长波长红移，吸收强度增加。在 UV-、可见光和黑暗条件下，测试了 SnO2 样品对普通大肠杆菌（E. coli ATCC 25922）的抗菌有效性。通过 SnO2 带隙修饰，表面活性剂促进了可见光下的抗菌效果。相比之下，无表面活性剂的 SnO2 在紫外光下具有更高的光杀灭活性。讨论了 SnO2 样品的抗菌性能与其结构和形态特征（如粒径、表面积和可见光/紫外光吸收能力）之间的关系。
