多結晶共性有機枠膜は,膜ではなく吸着剤として作用する
Julie L Fenton1, David W Burke1, Dingwen Qian2
1Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.
Journal of the American Chemical Society
|January 13, 2021
まとめ
結合有機枠 (COF) 材料は,分離のためのサイズ選択膜ではなく,効果的な吸着剤です. エントロピーによって誘発される高容量吸収は,以前に観察された"膜"性能を説明する.
科学分野:
- 材料科学
- 化学工学
- 分離科学
背景:
- エネルギー効率の良い分離のために共性有機フレームワーク (COF) が探求されており,厚い膜はサイズ選択輸送によって様々な分子を分離すると報告されています.
- 以前の研究では,COF膜は,オーダーされた毛穴を通って,サイズに基づいて分子を排除することによって機能することを示唆しました.
研究 の 目的:
- 厚い多結晶COF膜の分離メカニズムを調査する.
- COFフィルムがサイズ選択性膜か吸着剤として作用するかどうかを判断する.
主な方法:
- COF粉末の染料の吸収同温度は測定された.
- 吸収熱力学を理解するために計算モデルが使用されました.
- COFペレットは,さまざまな条件 (体積,流量) で染料の"拒絶"をテストした.
- 混合染料分離実験はフローで実施した.
主要な成果:
- COF粉は染料に対する高容量吸収を示し,親和度は3桁の大きさである.
- アドソープションの行動は,以前に報告された"分離"の性能と相関しています.
- 計算分析は,吸収の差をエントロピーの増加と関連付けます.
- COFペレットは,吸着に一致する,体積とフローレートに依存する染料除去を示しています.
結論:
- 厚い多結晶COF膜は主に吸着剤として機能し,サイズ選択膜ではありません.
- 以前の研究で観察された分離現象は,吸収メカニズムによって説明できます.
- この発見は,COF膜に関する文献の再評価を必要とします.
- 毛孔輸送に基づくCOFを用いた効率的な分離は,まだ未解決の課題です.
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