Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 59, Pages 15791-15795Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201804335
Keywords
amphiphilic polymers; anion recognition; calixpyrroles; thermoresponsiveness; water purification
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Funding
- King Abdullah University of Science and Technology [CRG6 2017 3503]
- Robert A. Welch Foundation [F-0018]
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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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