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Imidazolium‐Functionalized Chemically Robust Ionic Porous Organic Polymers ( i POPs) toward Toxic Oxo‐Pollutants Capture from Water
Author(s) -
Sen Arunabha,
Dutta Subhajit,
Dam Gourab K.,
Samanta Partha,
Let Sumanta,
Sharma Shivani,
Shirolkar Mandar M.,
Ghosh Sujit K.
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202102399
Subject(s) - chemistry , pollutant , ionic bonding , selectivity , binding energy , metal , polymer , ionic liquid , ion , hydration energy , inorganic chemistry , organic chemistry , catalysis , physics , nuclear physics
Fabricating new and efficient materials aimed at containment of water contamination, in particular removing toxic heavy metal based oxo‐anions (e. g. CrO 4 2− , TcO 4 − ) holds paramount importance. In this work, we report two new highly stable imidazolium based ionic porous organic polymers ( i POPs) decorated with multiple interaction sites along with electrostatics driven adsorptive removal of such oxo‐anions from water. Both the i POPs (namely, i POP‐3 and i POP‐4) exhibited rapid sieving kinetics and very high saturation uptake capacity for CrO 4 2− anions (170 and 141 mg g −1 for i POP‐3 and i POP‐4 respectively) and ReO 4 − (515.5 and 350.3 mg g −1 for i POP‐3 and i POP‐4 respectively), where ReO 4 − anions being the non‐radioactive surrogative counterpart of radioactive TcO 4 − ions. Noticeably, both i POPs showed exceptional selectivity towards CrO 4 2− and ReO 4 − even in presence of several other concurrent anions such as Br − , Cl − , SO 4 2− , NO 3 − etc. The theoretical binding energy calculations via DFT method further confirmed the preferential interaction sites as well as binding energies of both i POPs towards CrO 4 2− and ReO 4 − over all other competing anions which corroborates with the experimental high capacity and selectivity of i POPs toward such oxo‐anions.