State Key Lab of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.
School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong, 518172, China.
Chemistry. 2018 Nov 2;24(61):16426-16431. doi: 10.1002/chem.201803628. Epub 2018 Oct 11.
High internal phase emulsion (HIPE) templating offers an efficient approach to prepare 3D hierarchical porous metal-organic framework (MOF)-based monoliths. However, conventional poly-Pickering HIPEs synthesized from MOF-stabilized HIPEs have low permeability due to closed-cell structures, thus limiting their applications. Herein, interconnected porous MOF monoliths, prepared by adding a small amount of polyvinyl alcohol (PVA) as co-stabilizer into UiO-66 stabilized Pickering HIPE templates are reported. The morphology of the porous monoliths was studied by scanning electron microscopy (SEM). The pore size could be well controlled by varying the PVA concentration. A unique morphology, formed by an ice template, was clearly seen on the cell wall. The pores were thus interconnected. The mass transfer performance of the monoliths having different cell structures was investigated by CO adsorption. The interconnected porous structure significantly accelerated the CO adsorption process, as well as enhancing the saturated adsorption capacity.
高内相比乳液（HIPE）模板法为制备 3D 分级多孔金属-有机骨架（MOF）基整体材料提供了一种有效的方法。然而，由于闭孔结构，由 MOF 稳定的 HIPE 合成的传统多聚 Pickering HIPE 的渗透性较低，从而限制了它们的应用。在此，通过在 UiO-66 稳定的 Pickering HIPE 模板中添加少量聚乙烯醇（PVA）作为共稳定剂，制备了具有互连通孔的 MOF 整体材料。通过扫描电子显微镜（SEM）研究了多孔整体材料的形态。通过改变 PVA 浓度可以很好地控制孔径。在细胞壁上可以清楚地看到由冰模板形成的独特形态。因此，孔是相互连通的。通过 CO 吸附研究了具有不同孔结构的整体材料的传质性能。互连通孔结构显著加快了 CO 的吸附过程，同时提高了饱和吸附容量。
