Volume 27, Issue 53 p. 13442-13449
Full Paper

Imidazolium-Functionalized Chemically Robust Ionic Porous Organic Polymers (iPOPs) toward Toxic Oxo-Pollutants Capture from Water

Arunabha Sen

Arunabha Sen

Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Dr. HomiBhabha Road, Pashan, Pune 411008 India

These authors contributed equally to this work.

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Subhajit Dutta

Subhajit Dutta

Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Dr. HomiBhabha Road, Pashan, Pune 411008 India

These authors contributed equally to this work.

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Gourab K. Dam

Gourab K. Dam

Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Dr. HomiBhabha Road, Pashan, Pune 411008 India

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Dr. Partha Samanta

Dr. Partha Samanta

Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Dr. HomiBhabha Road, Pashan, Pune 411008 India

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Sumanta Let

Sumanta Let

Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Dr. HomiBhabha Road, Pashan, Pune 411008 India

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Dr. Shivani Sharma

Dr. Shivani Sharma

Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Dr. HomiBhabha Road, Pashan, Pune 411008 India

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Dr. Mandar M. Shirolkar

Dr. Mandar M. Shirolkar

Symbiosis Center for Nanoscience and Nanotechnology (SCNN), Symbiosis International (Deemed University) (SIU), Lavale, Pune 412115 Maharashtra, India

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Prof. Sujit K. Ghosh

Corresponding Author

Prof. Sujit K. Ghosh

Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Dr. HomiBhabha Road, Pashan, Pune 411008 India

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First published: 14 July 2021
Citations: 25

Graphical Abstract

An example of utilization of imidazole-functionalized chemically robust cationic porous organic polymers (POPs) for rapid and efficient capture of hazardous dual oxo-anionic pollutants from water. The study will enrich the concept of designing new efficient cationic polymeric materials to tackle the problems based on water pollution, one of the most important threats towards the initiative for a green and clean environment.

Abstract

Fabricating new and efficient materials aimed at containment of water contamination, in particular removing toxic heavy metal based oxo-anions (e. g. CrO42−, TcO4) holds paramount importance. In this work, we report two new highly stable imidazolium based ionic porous organic polymers (iPOPs) decorated with multiple interaction sites along with electrostatics driven adsorptive removal of such oxo-anions from water. Both the iPOPs (namely, iPOP-3 and iPOP-4) exhibited rapid sieving kinetics and very high saturation uptake capacity for CrO42− anions (170 and 141 mg g−1 for iPOP-3 and iPOP-4 respectively) and ReO4 (515.5 and 350.3 mg g−1 for iPOP-3 and iPOP-4 respectively), where ReO4 anions being the non-radioactive surrogative counterpart of radioactive TcO4 ions. Noticeably, both iPOPs showed exceptional selectivity towards CrO42− and ReO4 even in presence of several other concurrent anions such as Br, Cl, SO42−, NO3 etc. The theoretical binding energy calculations via DFT method further confirmed the preferential interaction sites as well as binding energies of both iPOPs towards CrO42− and ReO4 over all other competing anions which corroborates with the experimental high capacity and selectivity of iPOPs toward such oxo-anions.

Conflict of interest

The authors declare no conflict of interest.