Qin Shun-Shun, Wang Ze-Kun, Hu Lei, Du Xing-Hao, Wu Zheng, Strømme Maria, Zhang Qian-Feng, Xu Chao
Institute of Molecular Engineering and Applied Chemistry, Anhui University of Technology, Ma'anshan, 243002, P. R. China.
Department of Materials Science and Engineering, Uppsala University, The Ångström Laboratory, Box 35, 751 03 Uppsala, Sweden.
Nanoscale. 2021 Feb 25;13(7):3967-3973. doi: 10.1039/d1nr00172h.
Porous organic frameworks (POFs) with predesigned structures and tunable porosities have been widely studied in adsorption and heterogeneous catalysis. Introducing ionic structure into the framework endows POFs with new functionalities that may extend their applications. Here, we report new applications for a guanidinium-based ionic POF (IPOF-Cl) in palladium scavenging and heterogeneous catalysis. Due to the ionic framework and the porous structure, the IPOF-Cl displays fast adsorption kinetics and high adsorption capacities (up to 754 mg g-1) of Na2PdCl4 in aqueous solutions via a chemisorption (ion exchange) process. Significantly, it shows excellent scavenging activity towards trace amount of [PdCl4]2- in aqueous solution. More importantly, the loaded [PdCl4]2- species on the IPOF substrate are further reduced into ultrafine Pd nanoparticles with size of ∼2-5 nm. The obtained IPOF-Pd(0) nanocomposite containing uniformly distributed Pd nanoparticles and hierarchical porous structure demonstrates high activity in catalyzing a range of Suzuki coupling reactions. This study provides new routes for the development of ionic porous organic materials for applications in metal scavenging and catalysis.
具有预先设计结构和可调孔隙率的多孔有机框架（POFs）在吸附和多相催化领域已得到广泛研究。将离子结构引入框架赋予了POFs新的功能，这可能会扩展它们的应用范围。在此，我们报道了一种基于胍盐的离子型POF（IPOF-Cl）在钯清除和多相催化方面的新应用。由于其离子框架和多孔结构，IPOF-Cl在水溶液中通过化学吸附（离子交换）过程对Na2PdCl4表现出快速的吸附动力学和高吸附容量（高达754 mg g-1）。值得注意的是，它对水溶液中痕量的[PdCl4]2-显示出优异的清除活性。更重要的是，负载在IPOF载体上的[PdCl4]2-物种进一步被还原为尺寸约为2 - 5 nm的超细钯纳米颗粒。所获得的包含均匀分布的钯纳米颗粒和分级多孔结构的IPOF-Pd(0)纳米复合材料在催化一系列铃木耦合反应中表现出高活性。这项研究为开发用于金属清除和催化应用的离子型多孔有机材料提供了新途径。
