用于 CO2/N2 分离的芳香胺官能化共价有机骨架 (COF),ACS Applied Materials & Interfaces

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用于 CO2/N2 分离的芳香胺官能化共价有机骨架 (COF)
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-01-17 , DOI: 10.1021/acsami.2c17672
Ellen Dautzenberg ₁ , Guanna Li _{1,

2} , Louis C P M de Smet ₁

Affiliation

CO ₂是废气的一个突出例子，众所周知它对全球变暖的影响很大。_{因此，从工业过程的 CO 2}排放中捕获碳对于阻止和防止全球变暖的破坏性后果越来越重要。作为多孔纳米材料的共价有机骨架 (COF) 已被证明可以选择性地大量吸附 CO _{2并具有高 CO}₂ /N ₂选择性。与胺的相互作用被认为可以选择性地吸附 CO ₂并有助于从废气排放中捕获它。在此，新型 COF (Me ₃ TFB-(NH ₂ ) ₂_{BD) 无法通过直接缩合反应获得，通过以 Me 3} TFB-BD为起始的动态接头交换合成。^{尽管进行了接头交换，但 COF 的孔隙率基本保持不变，从而导致 1624 ± 89 m 2} /g的高 BET 表面积。研究了 273 和 295 K 下的CO ₂和 N _{2吸附等温线，以确定烟道气条件下的碳捕获性能。}Me ₃ TFB-(NH ₂ ) ₂ BD在 1 bar 以及 273 和 295 K 下分别吸附 1.12 ± 0.26 和 0.72 ± 0.07 mmol/g CO _{2 。}COF 显示高 CO ₂ /N ₂烟气条件下的 IAST 选择性 (273 K:83 ± 11, 295 K: 47 ± 11)。芳族胺基与CO ₂的相互作用是基于物理吸附，这有望使材料的能量再生变得高效。

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Aromatic Amine-Functionalized Covalent Organic Frameworks (COFs) for CO2/N2 Separation

CO₂ is a prominent example for an exhaust gas, and it is known for its high impact on global warming. Therefore, carbon capture from CO₂ emissions of industrial processes is increasingly important to halt and prevent the disruptive consequences of global warming. Covalent organic frameworks (COFs) as porous nanomaterials have been shown to selectively adsorb CO₂ in high quantities and with high CO₂/N₂ selectivity. Interactions with amines are recognized to selectively adsorb CO₂ and help capture it from exhaust emissions. Herein, a novel COF (Me₃TFB-(NH₂)₂BD), which was not accessible via a direct condensation reaction, was synthetized by dynamic linker exchange starting with Me₃TFB-BD. Despite the linker exchange, the porosity of the COF was largely maintained, resulting in a high BET surface area of 1624 ± 89 m²/g. The CO₂ and N₂ adsorption isotherms at 273 and 295 K were studied to determine the performance in carbon capture at flue gas conditions. Me₃TFB-(NH₂)₂BD adsorbs 1.12 ± 0.26 and 0.72 ± 0.07 mmol/g of CO₂ at 1 bar and 273 and 295 K, respectively. The COF shows a high CO₂/N₂ IAST selectivity under flue gas conditions (273 K:83 ± 11, 295 K: 47 ± 11). The interaction of the aromatic amine groups with CO₂ is based on physisorption, which is expected to make the regeneration of the material energy efficient.

更新日期：2023-01-17

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