Highly dispersed palladium nanoparticles anchored on UiO-66(NH2) metal-organic framework as a reusable and dual functional visible-light-driven photocatalyst
Highly dispersed palladium nanoparticles anchored on UiO-66(NH2) metal-organic framework as a reusable and dual functional visible-light-driven photocatalyst
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锚定在 UiO-66(NH2) 金属有机框架上的高度分散的钯纳米颗粒作为可重复使用的双功能可见光驱动光催化剂
DOI：
10.1039/c3nr03153e
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发表时间：
2013-01-01
期刊：
影响因子：
6.7
通讯作者：
Wu, Ling
中科院分区：
文献类型：
--
作者：
Shen, Lijuan;Wu, Weiming;Wu, Ling
合理设计和制备高性能、稳定的双功能光催化材料是一个重要的研究目标。在这项工作中，高度分散的Pd纳米粒子约3-6 nm的直径固定在金属有机框架（MOF）UiO-66（NH 2）通过一锅水热法。由于Pd纳米颗粒的高度分散性及其与基质的紧密接触，使得光捕获和光生电子-空穴对的分离得到增强，因此与UiO-66（NH 2）相比，所得到的Pd@UiO-66（NH 2）纳米复合材料表现出优异的可重复使用性和更高的可见光光催化还原Cr（VI）的活性。更重要的是，Pd@UiO-66（NH 2）可以用于同时光催化降解有机污染物，如甲基橙子（MO）和亚甲基蓝（MB），并还原Cr（VI），甚至进一步增强的活性在二元系统中，这可能是由于光催化氧化和还原之间的协同效应，通过单独消耗光生空穴和电子。这项工作代表了使用基于MOFs的材料作为双功能光催化剂同时去除不同类别污染物的第一个例子。我们的发现不仅证明了MOFs基材料的设计和应用的巨大潜力，而且可能为开发新的高性能光催化剂带来新的机会。
Proper design and preparation of high-performance and stable dual functional photocatalytic materials remains a significant objective of research. In this work, highly dispersed Pd nanoparticles of about 3-6 nm in diameter are immobilized in the metal-organic framework (MOF) UiO-66(NH2) via a facile one-pot hydrothermal method. The resulting Pd@UiO-66(NH2) nanocomposite exhibits an excellent reusable and higher visible light photocatalytic activity for reducing Cr(VI) compared with UiO-66(NH2) owing to the high dispersion of Pd nanoparticles and their close contact with the matrix, which lead to the enhanced light harvesting and more efficient separation of photogenerated electron-hole pairs. More significantly, the Pd@UiO-66(NH2) could be used for simultaneous photocatalytic degradation of organic pollutants, like methyl orange (MO) and methylene blue (MB), and reduction of Cr(VI) with even further enhanced activity in the binary system, which could be attributed to the synergetic effect between photocatalytic oxidation and reduction by individually consuming photogenerated holes and electrons. This work represents the first example of using the MOFs-based materials as dual functional photocatalyst to remove different categories of pollutants simultaneously. Our finding not only proves great potential for the design and application of MOFs-based materials but also might bring light to new opportunities in the development of new high-performance photocatalysts.