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リチウム塩化物の選択的分離ストラップされたカリックス[4]ピロルを含むオルガノゲル

Hu Wang¹, Leighton O Jones², Inhong Hwang¹

¹Department of Chemistry, 105 East 24th Street, Stop A5300, The University of Texas at Austin, Austin, Texas 78712, United States.

Journal of the American Chemical Society

|November 23, 2021

まとめ

2つの新しいカリックス[4]ピロール受容体は,リチウム塩化物 (LiCl) を他の塩よりも選択的に結合する. これらの受容体から派生した機能化されたゲルは効率的にLiClを吸収し,リチウムの浄化とリサイクルの可能性を示しています.

科学分野:

超分子化学
材料科学
緑の化学

背景:

クラウンエーテル帯のカリックス[4]パイロルは,イオン認識のための効果的なホストである.
リチウムの抽出とリサイクルなどの用途には選択的イオン結合が不可欠です
イオン分離のためのリサイクル可能な材料の開発は大きな課題です.

研究の目的:

選択的リチウム塩化物 (LiCl) 結合の可能性のある新しい機能化されたカリックス[4]ピロール受容体 (H1およびH2) を合成し,特徴づけること.
これらの受容体からポリマーゲル (G1とG2) を開発し,実際的なLiCl吸附と放出を行う.
混合塩溶液からLiClを分離するためのこれらのゲルの選択性と再利用性を評価する.

主な方法:

溶液 (ニトロベンゼン-d5,アセトニトリル-d3) での塩結合実験
理論的な親和性および選択性分析のための密度関数理論 (DFT) の計算.
機能化された受容体とアクリラートモノマーとクロスリンカーを共ポリマー化してポリマーゲルを形成する.
混合塩溶液と溶媒の極性切り替え (アセトニトリル/メタノール) を用いた吸附/脱吸収試験

主要な成果:

H1とH2は,NaCl,KCl,MgCl2,CaCl2に対するLiClの選択的結合を示した.
DFT計算は,H1とH2に対する特定の親和性と選択性を明らかにする実験的発見を裏付けました.
生成したゲル (G1とG2) は,アセトニトリルで混合された塩溶液からLiClを効果的に吸収します.
LiClはメタノール中のゲルから放出され,ゲルは繰り返し使用するためにリサイクルされました.
溶媒の極性転換は,LiClの分離と回収を推進する効果的なメカニズムとして確認された.

結論:

機能化されたカリックス[4]ピロール受容体およびその派生ゲルは,LiClに対する高い選択性を示す.
開発されたゲル材料はリサイクル可能で,溶媒の極性切り替えによるLiCl分離に有効です.
これらの発見はリチウムの浄化とリサイクルアプリケーションに有望なアプローチを示しています.

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