Polyamide nanofiltration membranes with an interlayer of either a plant polyphenol tannic acid (TA) coating to improve polyamide formation or zeolitic imidazolate framework-8 (ZIF-8) nanoparticles (NPs) as a sacrificial template have been recently attracting great interest, although none has reported such a dual-functional interlayer. In this study, we demonstrated a facile and controllable one-pot synthesis of novel ZIF-8@TA core-shell NPs. Mixing Zn²⁺, Hmim, and TA in an aqueous solution could readily give rise to these NPs. Microscopy characterizations showed that composition and morphology of NPs could be easily controlled by the amount of TA used. Comparing with the thin film nanocomposite (TFN) membrane prepared with ZIF-8 NPs as an interlayer, which had significant defects in its polyamide layer due to the aggregation of hydrophobic ZIF-8 NPs, the homogeneous and hydrophilic ZIF-8@TA NPs interlayered TFN membranes demonstrated intact polyamide layers. It was found that when 0.5 mg ZIF-8@TA1.0 NPs were used, the obtained TFN membrane showed a high water permeance of 20.7 L m⁻² h⁻¹ bar⁻¹ and Na₂SO₄ rejection of 96.6 %, typically outperforming other interlayer-based PA membranes reported elsewhere. This work provided not only a novel interlayer material but also deep insights into design of high-performance polyamide membranes.

具有中间层的聚酰胺纳滤膜具有植物多酚单宁酸 (TA) 涂层以改善聚酰胺的形成或沸石咪唑骨架 8 (ZIF-8) 纳米粒子 (NPs) 作为牺牲模板最近引起了极大的兴趣，尽管没有报道了这种双功能中间层。在这项研究中，我们展示了一种简便且可控的一锅法合成新型 ZIF-8@TA 核壳 NPs。混合锌²⁺、Hmim 和 TA 在水溶液中很容易产生这些 NP。显微镜表征表明，NPs 的组成和形态可以很容易地通过 TA 的用量来控制。与以 ZIF-8 NPs 作为中间层制备的薄膜纳米复合材料 (TFN) 膜相比，由于疏水性 ZIF-8 NPs 的聚集，其聚酰胺层存在明显缺陷，均质且亲水性的 ZIF-8@TA NPs 夹层TFN 膜表现出完整的聚酰胺层。发现当使用0.5 mg ZIF-8@TA1.0 NPs时，所获得的TFN膜具有20.7 L m ^-2  h ^-1  bar ^-1和Na ₂ SO _{4的高透水性。}拒绝率为 96.6%，通常优于其他地方报道的其他基于夹层的 PA 膜。这项工作不仅提供了一种新型的中间层材料，而且为高性能聚酰胺膜的设计提供了深刻的见解。