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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
Author(s) -
Deng ShuQi,
Li DianMei,
Mo XiaoJing,
Miao YiLing,
Cai SongLiang,
Fan Jun,
Zhang WeiGuang,
Zheng ShengRun
Publication year - 2021
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.202000570
Subject(s) - cationic polymerization , amorphous solid , chemistry , adsorption , covalent bond , benzene , aqueous solution , metal organic framework , metal , inorganic chemistry , organic chemistry
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‐ a MOC‐1 , was constructed by covalent linking of a cationic Pd 12 L 24 (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 ( a MOC‐1 ) and BAPB as reactant via a low‐temperature solid‐state reaction. The CL‐ a MOC‐1 showed improved stability, lower solubility and higher oxo‐anion uptake in water compared with the original a MOC‐1 . The adsorption capacities for CrO 4 2− , Cr 2 O 7 2− and ReO 4 − on CL‐ a MOC‐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‐ a MOC‐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.