In the present study, a zeolitic imidazolate framework with mixed ligands, ZIF-8-90, was synthesized and embedded into an ultrathin polydimethyldiethoxysilane (PDMDES) matrix to prepare a ZIF-8-90/PDMDES mixed matrix membrane (MMM) for the enhanced recovery of alcohols from dilute aqueous solutions via pervaporation, using a facile solution coating method. The synthesized ZIF-8-90 particles demonstrated superior hydrophobicity and thermal stability compared to those of both ZIF-8 and ZIF-90 particles. Furthermore, the hydrophobicity, thermal stability, and sorption ability for alcohols of the ZIF-8-90/PDMDES MMM were significantly improved, attributed to the incorporation of mixed-ligand ZIF-8-90. Notably, the MMMs displayed two distinct cross-sectional morphologies: (1) ZIF-8-90 particles enveloped by PDMDES polymer forming filler bulges and (2) an accumulation of ZIF-8-90 particles resembling a brick-wall-like structure. The MMM incorporating 2.5 wt % ZIF-8-90 exhibited the optimal performance among the fabricated MMMs with various ZIF-8-90 loadings, spanning from 0 to 3.2 wt %. The effects of feed concentrations and operation temperatures were systematically investigated. The best pervaporation performance was achieved using the 2.5 wt % ZIF-8-90-filled MMM, effectively separating a 5.0 wt % ethanol/water mixture at 60 °C, yielding a distinguished total flux of 7.70 kg·m^–2·h^–1, an improved separation factor of 9.96, and an extraordinarily high PSI of 68.99 kg·m^–2·h^–1. Comparative analyses highlighted the superior pervaporation performance of the ZIF-8-90/PDMDES MMM over ZIF-8/PDMDES MMM, ZIF-90/PDMDES MMM, and other MMMs, underscoring its potential for practical applications in alcohol recovery.

中文翻译：

---

将混合配体沸石咪唑酯框架掺入聚二甲基二乙氧基硅烷 （PDMDES） 膜中以增强醇渗透蒸发回收


在本研究中，合成了具有混合配体 ZIF-8-90 的沸石咪唑骨架，并将其包埋到超薄聚二甲基二氧基硅烷 （PDMDES） 基质中，制备了 ZIF-8-90/PDMDES 混合基质膜 （MMM），用于通过渗透蒸发提高稀水溶液中醇的回收率，使用简单的溶液包被方法。与 ZIF-8 和 ZIF-90 颗粒相比，合成的 ZIF-8-90 颗粒表现出优异的疏水性和热稳定性。此外，由于混合配体 ZIF-8-90 的掺入，ZIF-8-90/PDMDES MMM 的疏水性、热稳定性和对醇的吸附能力得到显着改善。值得注意的是，MMMs 显示出两种不同的横截面形态：（1） ZIF-8-90 颗粒被 PDMDES 聚合物包裹形成填料凸起和 （2） ZIF-8-90 颗粒的积累类似于砖墙状结构。掺入 2.5 wt % ZIF-8-90 的 MMM 在具有各种 ZIF-8-90 负载量（范围从 0 到 3.2 wt %）的制造的 MMM 中表现出最佳性能。系统地研究了饲料浓度和操作温度的影响。使用 2.5 wt % ZIF-8-90 填充的 MMM 实现了最佳的渗透蒸发性能，在 60 °C 下有效分离了 5.0 wt % 乙醇/水混合物，产生了 7.70 kg·m^–2·h^–1 的显著总通量，分离因子提高了 9.96，PSI 非常高，达到 68.99 kg·m^–2·h^–1。比较分析表明，ZIF-8-90/PDMDES MMM 的渗透蒸发性能优于 ZIF-8/PDMDES MMM、ZIF-90/PDMDES MMM 和其他 MMM，凸显了其在酒精回收中实际应用的潜力。