Specific oriented metal-organic framework membranes and their facet-tuned separation performance.
Specific oriented metal-organic framework membranes and their facet-tuned separation performance.
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DOI：
10.1021/am5049702
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发表时间：
2014-09
影响因子：
9.5
通讯作者：
Yiyin Mao;Binbin Su;W. Cao;Junwei Li;Yulong Ying;Wen Ying;Yajun Hou;Luwei Sun;Xinsheng Peng
中科院分区：
文献类型：
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作者：
Yiyin Mao;Binbin Su;W. Cao;Junwei Li;Yulong Ying;Wen Ying;Yajun Hou;Luwei Sun;Xinsheng Peng
金属有机骨架（MOFs）的晶体形态或暴露的晶面的调节扩展了它们在催化、吸附和分离方面的潜在应用。在本文中，通过将柠檬酸盐调节剂固定在Au纳米颗粒上，随后固定在固体氢氧化铜纳米链上，在室温下形成了良好共生和取向的HKUST-1立方体晶体膜。相反，在没有Au纳米粒子的情况下，在水/乙醇和乙醇中分别形成了良好共生和取向的立方八面体和八面体膜。这些HKUST-1膜的气体分离性能通过其具有限定孔径的暴露面来调节。具有暴露的{001}面的HKUST-1立方体膜表现出最高的渗透性但最低的气体二元分离因子，而具有暴露的{111}面的八面体膜表现出最高的分离因子但最低的渗透性，因为{111}面的窗口尺寸为0.46 nm，小于{001}面的0.9 nm。HKUST-1八面体膜实现了0.38 nm CO2和0.55 nm SF6的分离。作为概念验证，这将开辟一种新的方式来设计MOF相关的分离膜的面控制。
Modulating the crystal morphology, or the exposed crystal facets, of metal-organic frameworks (MOFs) expands their potential applications in catalysis, adsorption, and separation. In this article, by immobilizing the citrate modulators on Au nanoparticles and subsequently being fixed on solid copper hydroxide nanostrands, a well-intergrown and oriented HKUST-1 cube crystal membrane was formed at room temperature. In contrast, in the absence of Au nanoparticles, well-intergrown and oriented cuboctahedron and octahedron membranes were formed in water/ethanol and ethanol, respectively. The gas separation performances of these HKUST-1 membranes were tuned via their exposed facets with defined pore sizes. The HKUST-1 cube membrane with exposed {001} facets demonstrated the highest permeance but lowest gas binary separation factors, while the octahedron membrane with exposed {111} facets presented the highest separation factors but lowest permeance, since the window size of {111} facets is 0.46 nm which is smaller than 0.9 nm of {001} facets. Separation of 0.38 nm CO2 from 0.55 nm SF6 was realized by the HKUST-1 octahedron membrane. As a proof of concept, this will open a new way to design MOF-related separation membranes by facet controlling.