Department of Chemistry, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, TX, 78712-1224, USA.
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, P. R. China.
Chemistry. 2018 Oct 22;24(59):15791-15795. doi: 10.1002/chem.201804335. Epub 2018 Sep 27.
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.
为了解决在无萃取条件下从水介质中去除不需要的阴离子的挑战，我们制备了一种具有侧基杯[4]吡咯（C4P）受体的温敏两亲聚合物。由于其两亲性，该聚合物在水中自组装成胶束。这些胶束包含埋藏在疏水性核心中的 C4P 受体。这允许各种铯阴离子进入胶束。由于亲水性嵌段链的热响应性，带阴离子的胶束在加热时在水中沉淀。简单的过滤即可将其从水相环境中去除，从而实现有效的水净化。用酸性水溶液处理阴离子捕获的胶束会导致竞争诱导释放结合的阴离子，从而使聚合物材料得以循环利用。
