Volume 61, Issue 1 e202113724
Research Article
Free to Read

Calix[4]pyrrole-based Crosslinked Polymer Networks for Highly Effective Iodine Adsorption from Water

Linhuang Xie

Linhuang Xie

Department of Chemistry, College of Science, Center for Supramolecular Chemistry & Catalysis, Shanghai University, 99 Shangda Road, Shanghai, 200444 P. R. China

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Zhiye Zheng

Zhiye Zheng

Department of Chemistry, College of Science, Center for Supramolecular Chemistry & Catalysis, Shanghai University, 99 Shangda Road, Shanghai, 200444 P. R. China

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Qiuyuan Lin

Qiuyuan Lin

Department of Chemistry, College of Science, Center for Supramolecular Chemistry & Catalysis, Shanghai University, 99 Shangda Road, Shanghai, 200444 P. R. China

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Huan Zhou

Huan Zhou

Department of Chemistry, College of Science, Center for Supramolecular Chemistry & Catalysis, Shanghai University, 99 Shangda Road, Shanghai, 200444 P. R. China

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Xiaofan Ji

Corresponding Author

Xiaofan Ji

School of Chemistry and Chemical Engineering, Key Laboratory of Materials Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Materials Chemistry and Service Failure, Huazhong University of Science and Technology, Wuhan, 430074 P. R. China

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Jonathan L. Sessler

Corresponding Author

Jonathan L. Sessler

Department of Chemistry, The University of Texas at Austin, 105 E. 24th Street A5300, Austin, TX, 78712 USA

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Hongyu Wang

Corresponding Author

Hongyu Wang

Department of Chemistry, College of Science, Center for Supramolecular Chemistry & Catalysis, Shanghai University, 99 Shangda Road, Shanghai, 200444 P. R. China

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First published: 08 November 2021
Citations: 117

Graphical Abstract

A series of calix[4]pyrrole-based crosslinked polymer networks was synthesized via Sonogashira–Hagihara polycondensation. One system, C[4]P-BTP, was found to be highly effective for iodine capture from water with an uptake capacity of 3.24 g g−1 and quick kinetics (kobs=7.814 g g−1 min−1). Flow-through adsorption experiments revealed that C[4]P-BTP was able to remove 93.2 % of iodine from an aqueous phase with a flow rate of 1 mL min−1.

Abstract

A series of calix[4]pyrrole-based crosslinked polymer networks designed for iodine capture is reported. These materials were prepared by Sonogashira coupling of α,α,α,α-tetra(4-alkynylphenyl)calix[4]pyrrole with bishalide building blocks with different electronic properties and molecular sizes. Despite their low Brunauer–Emmett–Teller surface areas, iodine vapor adsorption capacities of up to 3.38 g g−1 were seen, a finding ascribed to the presence of a large number of effective sorption sites including macrocyclic π-rich cavities, aryl units, and alkyne groups within the material. One particular system, C[4]P-BTP, was found to be highly effective at iodine capture from water (uptake capacity of 3.24 g g−1 from a concentrated aqueous KI/I2 solution at ambient temperature). Fast capture kinetics (kobs=7.814 g g−1 min−1) were seen. Flow-through adsorption experiments revealed that C[4]P-BTP is able to remove 93.2 % of iodine from an aqueous source phase at a flow rate of 1 mL min−1.

Conflict of interest

The authors declare no conflict of interest.

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