Photochemical synthesis and characterization of Ag/TiO2 nanotube composites
Photochemical synthesis and characterization of Ag/TiO2 nanotube composites
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DOI：
10.1007/s10853-007-2387-y
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发表时间：
2008-03-01
影响因子：
4.5
通讯作者：
Liu, Xiaoqi
中科院分区：
文献类型：
--
作者：
Li, Haibin;Duan, Xuechen;Liu, Xiaoqi
采用水热法制备了TiO 2纳米管。通过沉积法将直径约为3-5 nm的银纳米粒子负载到TiO 2纳米管表面，然后在紫外光照射下进行光化学还原。采用透射电子显微镜（TEM）、N-2吸附测试、X射线衍射（XRD）、X射线光电子能谱（XPS）、拉曼光谱、紫外-可见漫反射光谱（UV-vis）和荧光光谱（FL）对Ag/TiO 2纳米管复合材料进行了表征。以甲基橙子为目标染料，研究了其光催化活性。结果表明，当Ag+浓度较低时，银粒子处于零氧化态，高度分散在TiO 2纳米管表面。金属银的存在可以通过吸引光电子来帮助电子-空穴分离。在Ag/TiO 2纳米管复合材料中添加适量的银，可进一步提高其光催化降解水中甲基橙橙子的活性。
TiO2 nanotubes were fabricated by a hydrothermal method. Silver nanoparticles with diameters around 3-5 nm were loaded onto the surface of TiO2 nanotubes via a deposition approach followed by a photochemical reduction process under ultraviolet irradiation. Transmission electron microscopy (TEM), N-2 adsorption measurements, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV-vis diffuse reflectance spectroscopy (UV-vis), and fluorescence spectroscopy (FL) were applied to characterize the as-prepared Ag/TiO2 nanotube composites. The photocatalytic activity of the as-prepared materials was investigated by photodegrading of methyl orange. The results showed that silver particles were in zero oxidation state and highly dispersed on the surface of TiO2 nanotubes when the concentration of Ag+ was low. The presence of metallic silver can help the electron-hole separation by attracting photoelectrons. The Ag/TiO2 nanotube composites with a suitable amount of silver showed a further improvement on the photocatalytic activity for degradation of methyl orange in water.