In this paper, zeolitic imidazolate framework-71 (ZIF-71) particles (∼500 nm diameter) were modified with four different ligands through the solvent-assisted linker exchange (SALE) method. The objective of this was to assess the effect of ligand exchanged ZIF-71 on the performance of ZIF-71/polydimethylsiloxane (PDMS) mixed matrix membranes (MMMs) for removal of alcohol from dilute aqueous solutions. Both Fourier-transform infrared spectroscopy (ATR-FTIR) and proton nuclear magnetic resonance (¹H NMR) spectroscopy confirmed the exchange of the new ligands into the ZIF-71 material. The ¹H NMR spectra demonstrated the molar ratios of the ligand-exchange into the ZIF-71 particles. X-ray diffraction and scanning electron microscopy results showed that the crystal structure and the morphology of ZIF-71 were maintained after the ligand-exchange modification process. Modified ZIF-71/PDMS composite membranes were synthesized to study the effect of ligand modification on alcohol/water separation performance. Ligand-modified ZIFs dispersed more evenly in the condensation cure PDMS polymer matrix than the unmodified ZIFs. The alcohol permeability and alcohol/water selectivity for ethanol and 1-butanol remained the same or decreased for membranes made with ligand-exchanged ZIF-71 particles.

在本文中，通过溶剂辅助接头交换（SALE）方法用四个不同的配体修饰了沸石咪唑酯骨架71（ZIF-71）颗粒（直径约500 nm）。这样做的目的是评估配体交换的ZIF-71对ZIF-71 /聚二甲基硅氧烷（PDMS）混合基质膜（MMM）从稀水溶液中去除酒精的性能的影响。傅里叶变换红外光谱（ATR-FTIR）和质子核磁共振光谱（¹ H NMR）均证实了新配体已被交换为ZIF-71材料。在¹1 H NMR光谱证明了配体交换到ZIF-71颗粒中的摩尔比。X射线衍射和扫描电子显微镜结果表明，ZIF-71的晶体结构和形态在配体交换修饰后得以保持。合成了改性的ZIF-71 / PDMS复合膜，以研究配体改性对醇/水分离性能的影响。配体改性的ZIF比未改性的ZIF更均匀地分散在缩合固化的PDMS聚合物基质中。对于用配体交换的ZIF-71颗粒制成的膜，乙醇和1-丁醇的醇渗透性和醇/水选择性保持相同或降低。