Preparation of Au/TiO2 catalysts from Au(I)–thiosulfate complex and study of their photocatalytic activity for the degradation of methyl orange
Preparation of Au/TiO2 catalysts from Au(I)–thiosulfate complex and study of their photocatalytic activity for the degradation of methyl orange
复制标题
DOI：
10.1016/j.apcatb.2007.11.001
复制
发表时间：
2008-03
影响因子：
22.1
通讯作者：
Baozhu Tian;Jinlong Zhang;Tianzhong Tong;Feng Chen
中科院分区：
文献类型：
--
作者：
Baozhu Tian;Jinlong Zhang;Tianzhong Tong;Feng Chen
首次以Au(I) -硫代硫酸盐配合物（Au(S2O3)23−）为金前驱体制备了负载在TiO2（Au/TiO2）催化剂上的金。采用紫外-可见漫反射光谱、x射线衍射（XRD）、透射电子显微镜（TEM）、原子吸收火焰发射光谱（AAS）和x射线光电子能谱（XPS）等方法对样品进行表征。以Au(S2O3)23−为金前驱体，可以在TiO2表面成功形成具有高度分散状态的超细金纳米颗粒。当Au的标称负载从1%增加到8%时，Au纳米颗粒的直径从1.8 nm增加到3.0nm。通过对甲基橙（MO）的光降解分析，评价了Au/ tio2催化剂的光催化活性。在Au负载相似的情况下，用Au(S2O3)23−前驱体制备的催化剂比用沉积-沉淀（DP）和浸渍（IMP）法制备的Au/ tio2催化剂具有更高的降解甲基橙的光催化活性。制备方法对负载在tio2表面的Au纳米颗粒的形貌、大小和数量有决定性的影响，进而影响所得催化剂的光催化活性。
Gold loaded on TiO2(Au/TiO2) catalysts were prepared using Au(I)–thiosulfate complex (Au(S2O3)23−) as the gold precursor for the first time. The samples were characterized by UV–vis diffuse reflectance spectra, X-ray diffraction (XRD), transmission electron microscopy (TEM), atomic absorption flame emission spectroscopy (AAS), and X-ray photoelectron spectroscopy (XPS) methods. Using Au(S2O3)23−as gold precursor, ultra-fine gold nanoparticles with a highly disperse state can be successfully formed on the surface of TiO2. The diameter of Au nanoparticles increases from 1.8 to 3.0nm with increasing the nominal Au loading from 1% to 8%. The photocatalytic activity of Au/TiO2catalysts was evaluated from the analysis of the photodegradation of methyl orange (MO). With the similar Au loading, the catalysts prepared with Au(S2O3)23−precursor exhibit higher photocatalytic activity for methyl orange degradation when compared with the Au/TiO2catalysts prepared with the methods of deposition–precipitation (DP) and impregnation (IMP). The preparation method has decisive influences on the morphology, size and number of Au nanoparticles loaded on the surface of TiO2and further affects the photocatalytic activity of the obtained catalysts.