Abstract Interface compatibility between hydrophilic metal-organic frameworks (MOFs) and hydrophobic polydimethylsiloxane (PDMS) is less effectively reconciled through supramolecular modifications such as surfactant and polymer wrapping. Here we report a covalent cross-linking strategy to strengthen MOFs ~ PDMS interfaces. Zirconium MOFs (UiO-66-NH2) were modified with trimethoxysilan (TMS), which could further react with silanol terminated PDMS to enhance UiO-66 ~ PDMS interface compatibility. High content UiO-66-TMS (up to 50 wt%) were loaded into PDMS while retaining good membrane formation ability, mechanical properties and pervaporation selectivity, in contrast to pristine UiO-66-NH2 that decreases membrane strength and separation performances even at much lower loading content (10 wt%). Flux of mixed matrix membranes in dehydrating ethanol-water mixtures was highly improved while retaining the selectivity. It allows for the efficient production of concentrated ethanol (equivalent flux: 2234 g/m2h; ethanol in permeate: 53 wt%) from dilute feed through two-times consecutive pervaporation at 40 °C. Moreover, the membrane with covalently enhanced interfaces exhibit stable performance during 100 h continuous operation.

中文翻译：

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用于高通量 UiO-66-TMS/PDMS 渗透蒸发膜界面工程的共价交联

摘要 亲水性金属有机骨架 (MOF) 和疏水性聚二甲基硅氧烷 (PDMS) 之间的界面相容性通过表面活性剂和聚合物包裹等超分子改性不太有效。在这里，我们报告了一种共价交联策略，以加强 MOF~PDMS 界面。锆 MOFs (UiO-66-NH2) 用三甲氧基硅烷 (TMS) 修饰，可以进一步与硅烷醇封端的 PDMS 反应以增强 UiO-66 ~ PDMS 界面兼容性。将高含量的 UiO-66-TMS（高达 50 wt%）加载到 PDMS 中，同时保持良好的成膜能力、机械性能和渗透蒸发选择性，与原始 UiO-66-NH2 相比，即使在很多情况下也会降低膜强度和分离性能较低的负载量 (10 wt%)。在保持选择性的同时，混合基质膜在乙醇-水混合物脱水中的通量得到了极大改善。它允许从稀释进料通过在 40 °C 下连续两次渗透蒸发来高效生产浓缩乙醇（当量通量：2234 g/m2h；渗透物中的乙醇：53 wt%）。此外，具有共价增强界面的膜在连续运行 100 小时期间表现出稳定的性能。