Anisotropic Gas Separation in Oriented ZIF-95 Membranes Prepared by Vapor-Assisted In-Plane Epitaxial Growth
Anisotropic Gas Separation in Oriented ZIF-95 Membranes Prepared by Vapor-Assisted In-Plane Epitaxial Growth
复制标题
蒸汽辅助面内外延生长制备的定向 ZIF-95 膜的各向异性气体分离
DOI：
10.1002/anie.202008260
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发表时间：
2020-09-11
影响因子：
16.6
通讯作者：
Huang, Aisheng
中科院分区：
文献类型：
--
作者：
Ma, Xixi;Wan, Zheng;Huang, Aisheng
控制微结构的晶粒取向、晶界和厚度对于MOF膜是至关重要的。我们报道了一种新的合成策略，通过气相辅助面内外延生长制备高度取向的ZIF-95膜。在DMF/水蒸气混合气氛中，实现了ZIF-95种子层的面内外延生长，以获得厚度仅为600 nm的取向且良好共生的ZIF-95膜。实验和模拟研究表明，取向的ZIF-95膜具有良好的取向结构，晶间缺陷和传输路径明显减少，因而具有上级分离性能。在100 ℃和1 bar下分离等摩尔二元混合物时，H-2/CO（2）和H-2/CH（4）的混合物分离因子分别为32.2和53.7，H（2）的渗透率超过7.9 × 10（-7）mol m（-2）s（-1）Pa-1，是无规取向ZIF-95膜的4.6倍。
Control of the microstructure grain orientation, grain boundaries and thickness are crucial for MOF membranes. We report a novel synthesis strategy to prepare highlyc-oriented ZIF-95 membranes through vapor-assisted in-plane epitaxial growth. In a mixed DMF/water vapor atmosphere, in-plane epitaxial growth of a ZIF-95 seeds layer was achieved to obtain an oriented and well-intergrown ZIF-95 membrane with a thickness of only 600 nm. Demonstrated by both experimental and simulation studies, thec-oriented ZIF-95 membrane displayed superior separation performance because a perfectly oriented structure resulted in a notable reduction of intercrystalline defects and transport pathways. For the separation of equimolar binary mixtures at 100 degrees C and 1 bar, the mixture separation factors of H-2/CO(2)and H-2/CH(4)were 32.2 and 53.7, respectively, with an H(2)permeance of over 7.9x10(-7) mol m(-2) s(-1) Pa-1, which was 4.6 times higher than that of a randomly oriented ZIF-95 membrane.