Metallic nanoparticles immobilized in magnetic metal–organic frameworks: preparation and application as highly active, magnetically isolable and reusable catalysts
Metallic nanoparticles immobilized in magnetic metal–organic frameworks: preparation and application as highly active, magnetically isolable and reusable catalysts
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DOI：
10.1039/c4cy00072b
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发表时间：
2014-08
影响因子：
5
通讯作者：
Hai-juan Zhang;Shengda Qi;Xiaoying Niu;Jing Hu;C. Ren;Hongli Chen;Xingguo Chen
中科院分区：
文献类型：
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作者：
Hai-juan Zhang;Shengda Qi;Xiaoying Niu;Jing Hu;C. Ren;Hongli Chen;Xingguo Chen
催化反应后催化剂的分离和回收对于降低催化剂的成本以及避免工业应用中废物的产生至关重要。在本文中，超细贵金属纳米粒子被纳入菜花状多孔磁性金属有机框架（MOF）中。利用MOF中孔/表面结构的限制作用，成功获得了2-3 nm尺度的“无表面活性剂”金属纳米粒子。此外，MOFs涂层上MOFs壳的厚度和贵金属纳米粒子的含量都是可调的。此外，微球在催化还原对硝基苯酚方面表现出优异的性能，周转频率为3094 h−1。 MOFs壳中均匀的空腔为对硝基苯酚提供了对接位点，并充当限制纳米反应器，极大地提高了催化性能。最重要的是，磁响应微球可以很容易地通过磁场回收，并表现出优异的可重复使用性。所制备的催化剂对于其他硝基苯的还原也表现出良好的活性。因此，这项工作提供了一种高活性、磁隔离和可回收的催化剂，可用于各种催化工业过程。该基本模型可以进一步应用于各种生物医学领域，包括药物输送和生物分子分离。
Separation and recycling of catalysts after catalytic reactions are critically required to reduce the cost of catalysts as well as to avoid the generation of waste in industrial applications. In this paper, ultrafine noble metallic nanoparticles are incorporated into cauliflower-like porous magnetic metal–organic frameworks (MOFs). With the restriction effects of the pore/surface structure in the MOFs, “surfactant-free” metallic nanoparticles are successfully obtained on a 2–3 nm scale. In addition, both the thickness of MOFs shell and the content of noble metallic NPs are tunable on the MOFs coating. Moreover, the microspheres exhibit excellent performance for the catalytic reduction of p-nitrophenol with a turnover frequency of 3094 h−1. The uniform cavities in the MOFs shell provide docking sites for p-nitrophenol and act as confinement nanoreactors, which greatly improves the catalytic performance. Most importantly, the magnetically responsive microspheres can be easily recovered by a magnetic field and show excellent reusability. The as-prepared catalyst also shows good activity for the reduction of other nitrobenzenes. Consequently, this work provides a highly active, magnetically isolable, and recyclable catalyst, which can be used for various catalytic industrial processes. The fundamental model can be further employed in a variety of biomedical fields including drug delivery and biological molecules separation.