The composites of zeolite@metal organic framework (MOF) have received increasing attention due to their widespread applications. In this study, KCHA@ZIF-8 composites were successfully prepared by using KCHA (zeolite) as the core with coating ZIF-8 (MOF) by a two-step temperature-controlled and surfactant pretreatment method. Various characterizations confirmed the growth of a continuous and well-grown ZIF-8 shell on KCHA surface. Surprisingly, ZIF-8 could grow on KCHA surface in just 1 min. Also, the ZIF-8 load thickness could be adjusted by changing the adding amount of KCHA. Interestingly, the resulting composites exhibited excellent hydrophobic properties and maintained the excellent adsorption performance of KCHA core for the separation of CH/N. This study would provide a useful reference for the future synthesis of zeolite@MOF composites.

中文翻译：

---

深入了解核壳 KCHA@ZIF-8 复合材料的构建和生长过程

沸石@金属有机骨架(MOF)复合材料因其广泛的应用而受到越来越多的关注。本研究以KCHA（沸石）为核心，包覆ZIF-8（MOF），通过两步控温和表面活性剂预处理的方法成功制备了KCHA@ZIF-8复合材料。各种表征证实了 KCHA 表面上连续且生长良好的 ZIF-8 壳的生长。令人惊讶的是，ZIF-8 只需 1 分钟即可在 KCHA 表面生长。另外，ZIF-8的负载厚度可以通过改变KCHA的添加量来调节。有趣的是，所得复合材料表现出优异的疏水性能，并保持了 KCHA 核对 CH/N 分离的优异吸附性能。该研究将为未来沸石@MOF复合材料的合成提供有益的参考。