メタル・オーガニック・フレームワークにおける系統的なアニオン交換による可逆的な水吸収のための記録的吸収剤
Adam J Rieth1, Ashley M Wright1, Grigorii Skorupskii1
1Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States.
Journal of the American Chemical Society
|August 10, 2019
まとめ
研究者は低湿度で水蒸気の吸収を制御するために 金属有機フレームワークを改造しました ブロミドアニオンの導入により,孔の埋め込みが湿度を下げられ,水収集と冷却の新たな応用が可能になった.
科学分野:
- 材料科学
- 化学について
- 環境科学
背景:
- 低湿度での可逆的な水蒸気捕獲は,大気中の水の収集と持続可能な冷却技術の鍵です.
- 現在の方法は,水素とクロロ・フッ素炭素による効率と環境への影響の制限に直面しています.
研究 の 目的:
- 水蒸気吸収の強化のために,金属有機フレームワーク (MOF) の穴埋めの開始を調節する.
- MOFの水吸収特性に対するアニオン交換の影響を調査する.
主な方法:
- アニオン交換は,MOFの塩化イオンをフッ素,水酸化物,およびブロミドに置き換えるために使用された.
- 水中の水素結合構造を分析するために赤外線光譜を用いた.
- 材料の安定性を評価するために,水吸収- 脱吸収サイクルを実施した.
主要な成果:
- クロリドをフッ化物や水酸化物に置き換えると,孔詰めのための相対湿度が低下しなかった.
- ブロミドを導入すると 毛穴の埋着が相対湿度より低い状態に変化します
- 2つのMOF材料は400サイクルで記録的な水吸収能力と安定性を示しました.
結論:
- 孔径と水壁の相互作用は,孔壁の水性性よりも,水孔の充填に重要である.
- アニオン交換は,特定の水蒸気捕獲アプリケーションのためにMOFの特性を調整する実行可能な戦略を提供します.
- 開発されたMOFは,効率的で安定した大気水採集と冷却の見込みを示しています.
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