Covalent Cross‐Linking of Metal‐Organic Cages: Formation of an Amorphous Cationic Porous Extended Framework for the Uptake of Oxo‐Anions from Water,ChemPlusChem

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Covalent Cross‐Linking of Metal‐Organic Cages: Formation of an Amorphous Cationic Porous Extended Framework for the Uptake of Oxo‐Anions from Water
ChemPlusChem ( IF 3.0 ) Pub Date : 2020-11-24 , DOI: 10.1002/cplu.202000570
Shu-Qi Deng ₁ , Dian-Mei Li ₁ , Xiao-Jing Mo ₁ , Yi-Ling Miao ₁ , Song-Liang Cai ₁ , Jun Fan ₁ , Wei-Guang Zhang ₁ , Sheng-Run Zheng ₁

Affiliation

Cationic amorphous metal‐organic cage (MOC)‐based materials capable of removing anionic pollutants from water are receiving increasing attention but they are still relatively less reported. Herein, for the first time, a cationic porous MOC‐based extended framework, namely, CL‐aMOC‐1, was constructed by covalent linking of a cationic Pd₁₂L₂₄ (L=3,5‐di‐pyridin‐4‐yl‐benzaldehyde) cage with a 1,4‐bis(4‐aminophenyl)benzene (BAPB) linker. Interestingly, the reaction could be completed within 15 min using an amorphous MOC‐based solid (aMOC‐1) and BAPB as reactant via a low‐temperature solid‐state reaction. The CL‐aMOC‐1 showed improved stability, lower solubility and higher oxo‐anion uptake in water compared with the original aMOC‐1. The adsorption capacities for CrO₄²⁻, Cr₂O₇²⁻ and ReO₄⁻ on CL‐aMOC‐1 were 245.1, 311.5 and 452.5 mg/g, respectively, in which the uptake of Cr(VI)‐containing oxo‐anions was among the highest compared with those of other metal‐organic materials. The CL‐aMOC‐1 can selectively capture oxo‐anions in the presence of competitive anions. It exhibits good reusability as over 85 % of the uptake capacity is retained after 5 cycles. Finally, it shows the ability to remove Cr(VI) ions from electroplating wastewater.

中文翻译：

金属有机笼的共价交联：形成无定形阳离子多孔扩展框架，用于从水中吸收氧阴离子

能够去除水中阴离子污染物的阳离子非晶金属有机笼（MOC）基材料越来越受到关注，但报道仍然相对较少。在此，首次通过阳离子 Pd ₁₂ L ₂₄ (L=3,5-di - pyridin-4-基苯甲醛）笼与 1,4-双（4-氨基苯基）苯（BAPB）连接体。有趣的是，使用无定形 MOC 基固体（ MOC -1 ）和 BAPB 作为反应物，通过低温固相反应，该反应可以在 15 分钟内完成。与原始的a MOC-1相比，CL- a MOC-1在水中表现出更好的稳定性、更低的溶解度和更高的含氧阴离子吸收率。 CL- a MOC-1对 CrO ₄ ²⁻ 、Cr ₂ O ₇ ²⁻和 ReO ₄ ⁻的吸附容量分别为 245.1、311.5 和 452.5 mg/g，其中含 Cr(VI) 的氧代的吸收与其他金属有机材料相比，阴离子是最高的。 CL- a MOC-1可以在竞争性阴离子存在的情况下选择性地捕获含氧阴离子。它具有良好的可重复使用性，5 个循环后仍保留超过 85% 的吸收容量。最后，它显示了去除电镀废水中 Cr(VI) 离子的能力。

更新日期：2020-11-24

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