Fabrication of coenocytic Pd@CdS nanocomposite as a visible light photocatalyst for selective transformation under mild conditions
Fabrication of coenocytic Pd@CdS nanocomposite as a visible light photocatalyst for selective transformation under mild conditions
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共核Pd@CdS纳米复合材料的制备作为可见光光催化剂，用于温和条件下的选择性转化
DOI：
10.1039/c2jm15009c
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发表时间：
2012-02
影响因子：
--
通讯作者：
Yi-Jun Xu
中科院分区：
文献类型：
--
作者：
Nan Zhang;Siqi Liu;Xianzhi Fu;Yi-Jun Xu
通过一种简单的湿化学方法成功制备了纳米复合材料。通过场发射扫描电镜（FE-SEM）、透射电镜（TEM）、能量色散x射线能谱（EDX）、x射线光电子能谱（XPS）、x射线衍射（XRD）、紫外/可见漫反射光谱（DRS）、氮吸附-解吸和电子自旋共振光谱（ESR）等一系列技术对其结构和性能进行了表征。结果表明，钯纳米粒子作为多个核均匀分布在光活性CdS壳内，形成共胞纳米结构。研究发现，前驱体的浓度和贵金属胶体的内在性质在贵金属metal@semiconductor纳米复合材料的生长过程中起着至关重要的作用。据此，提出了一种可能的共胞Pd@CdS纳米复合材料的形成机制。以分子氧为氧化剂，在温和条件下选择性氧化一系列醇，评价了Pd@CdS的可见光催化活性。结果表明，与没有钯胶体纳米粒子作为种子的情况下，通过相同的方法获得的空白cds相比，共胞Pd@CdS具有更强的光催化活性。协同胞Pd@CdS光催化性能的增强可归因于增强的光吸收强度、更长的光生载流子寿命及其良好的吸附性能的耦合相互作用。期望我们的工作能为其他核壳纳米复合材料的制备提供有用的信息，并为其在光催化选择性有机转化领域的应用开辟一条道路。
Coenocytic Pd@CdS nanocomposite has been successfully prepared via a facile wet chemistry approach. Its structure and properties have been characterized by a series of techniques, including field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), ultra-violet/visible diffuse reflectance spectroscopy (DRS), nitrogen adsorption–desorption and electron spin resonance spectroscopy (ESR). The results demonstrate that the Pd nanoparticles as multiple cores are evenly distributed inside the photoactive CdS shell, forming a coenocytic nanostructure. It is found that the concentration of precursors and the intrinsic nature of noble metal colloids play essential roles in the growth process for such noble metal@semiconductor nanocomposite. Accordingly, a possible formation mechanism for the coenocytic Pd@CdS nanocomposite is proposed. The visible light photocatalytic activity of Pd@CdS has been evaluated by selective oxidation of a range of alcohols using molecular oxygen as oxidant under mild conditions. The results show that the coenocytic Pd@CdS exhibits enhanced photocatalytic activity as compared to blank-CdS obtained by the same procedure in the absence of Pd colloid nanoparticles as seeds. The enhanced photocatalytic performance of the coenocytic Pd@CdS can be ascribed to the coupling interaction of enhanced light absorption intensity, the longer lifetime of photogenerated charge carriers and its favorable adsorptivity. It is expected that our work could provide useful information for fabricating other core-shell nanocomposites and open an avenue to utilizing them in the field of photocatalytic selective organic transformations.
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影响因子：
8.6
作者：
Priolkar, KR;Bera, P;Lalla, NP
通讯作者：
Lalla, NP
DOI：
10.1002/chin.200117227
发表时间：
2001-04
期刊：
ChemInform
影响因子：
--
作者：
F. Caruso
通讯作者：
F. Caruso
影响因子：
3.9
作者：
Li, Y;Boone, E;El-Sayed, MA
通讯作者：
El-Sayed, MA
影响因子：
4.9
作者：
Palmisano, Giovanni;Garcia-Lopez, Elisa;Palmisano, Leonardo
通讯作者：
Palmisano, Leonardo
DOI：
10.1021/la1032288
发表时间：
2011-01
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
S. Rengaraj;S. Venkataraj;S. H. Jee;Younghun Kim;C. Tai;E. Repo;A. Koistinen;A. Ferancová;M. Sillanpää
通讯作者：
S. Rengaraj;S. Venkataraj;S. H. Jee;Younghun Kim;C. Tai;E. Repo;A. Koistinen;A. Ferancová;M. Sillanpää