Synthesis, characterization and photocatalytic activity of different metal-doped titania systems
Synthesis, characterization and photocatalytic activity of different metal-doped titania systems
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DOI：
10.1016/j.apcata.2006.03.046
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发表时间：
2006-06-07
影响因子：
5.5
通讯作者：
Urbano, F. J.
中科院分区：
文献类型：
--
作者：
Colmenares, J. C.;Aramendia, M. A.;Urbano, F. J.
采用溶胶-凝胶法合成了不同过渡金属(Ag、Fe、Pd、Pt、Zn、Zr)掺杂的二氧化钛基体系。采用多种物理技术(电感耦合等离子体质谱、氮气等温线、热重-差热分析、透射电子显微镜、X射线衍射仪、傅立叶变换拉曼光谱和紫外可见光谱)对样品进行了表征。研究了凝胶在磁力搅拌(ST)和超声辐照(US)下老化对所得固体性质的影响。超声处理确保了纯锐钛矿纳米颗粒的获得，并且通常会导致比表面积的增加。对所有固体样品进行了异丙醇气相选择光氧化实验。无论采用何种陈化方式，Pd、Pt或Ag的掺杂均导致摩尔转化率比未掺杂的TiO2光催化剂的摩尔转化率增加，而Fe和Zr的掺杂对摩尔转化率有不利影响。超声波对其质构和结构特征的影响最大的固体(裸露的二氧化钛和含锌的样品)在摩尔转化率上表现出最大的差异。此外，在大多数情况下，对丙酮具有很高的选择性。(C)2006爱思唯尔B.V.保留所有权利。
Different titania-based systems doped with diverse transition metals (Ag, Fe, Pd, Pt, Zn and Zr) were synthesized by the sol-gel method. Samples were characterized by a wide range of physical techniques (ICP-MS, N-2-isotherms, TGA-DTA, TEM, XRD, FF-Raman and UV-vis spectroscopies). The effect of aging of the gel either under magnetic stirring (ST) or ultrasonic irradiation (US) on the characteristics of the resulting solids was studied. Sonication ensured the obtention of pure anatase nanoparticles and generally led to an increase in surface area. All the solids were tested for gas phase selective photooxidation of 2-propanol. Irrespective of the aging method, doping with Pd, Pt or Ag resulted in an increase in molar conversion as compared to bare-TiO2, whereas the presence of Fe and Zr had a detrimental effect. Those solids for which sonication had the greatest impact on textural and structural characteristics (bare-TiO2 and Zn-containing samples) exhibited the greatest difference in molar conversion. Moreover, high selectivities to acetone were achieved in most of the cases. (c) 2006 Elsevier B.V. All rights reserved.