Removal of Anions from Aqueous Media by Means of a Thermoresponsive Calix[4]pyrrole Amphiphilic Polymer

Chemistry : a European Journal
Xiaofan JiJonathan L Sessler

Abstract

To address the challenge of removing unwanted anions from aqueous media under extraction-free conditions we have prepared a thermoresponsive amphiphilic polymer with pendent calix[4]pyrrole (C4P) receptors. Because of its amphipathicity, this polymer self-assembles into micelles in water. These micelles contain the C4P receptors buried in a hydrophobic core. This allows uptake of various cesium anions into the micelles. Due to the thermal responsiveness of the hydrophilic block chain, the anion-bearing micelles precipitate in water upon heating. Simple filtration allows their removal from the aqueous environment, thus allowing for effective water purification. Treating the anion-trapped micelles with acidic aqueous solution leads to the competition-induced release of the bound anion and thus recycling the polymeric material.

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Citations

Jul 30, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Mandeep K ChahalJonathan P Hill
Jun 8, 2021·Chemical Science·Whitney S Y OngSheel C Dodani
Dec 18, 2020·Accounts of Chemical Research·Gengwu ZhangNiveen M Khashab
Jun 12, 2019·Accounts of Chemical Research·Xiaofan JiJonathan L Sessler

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