Amine‐scrubbing‐based chemical absorption remains a prominent CO2 capture process. However, the overall efficiency of conventional amine absorbents is hard to meet the ever‐increasing demands for CO2 capture. Consequently, developing powerful absorbents for efficient and cost‐effective CO2 capture is greatly important but challenging. Here, a new type of amine absorbent with improved solubility and stability was achieved by substituting the secondary amino groups in piperazine (PZ) with aminoethyl and hydroxyalkyl moieties. The developed amine absorbent presents superior CO2 absorption/desorption abilities through the synergy of their intramolecular amines, leading to a low regeneration energy consumption of 2.56 GJ·t−1 CO2. Moreover, the enhancement of CO2 capture and the corresponding mechanism were elucidated using density functional theory calculations and nuclear magnetic resonance analysis. Such newly developed amine absorbent with excellent CO2 capture performance are expected to greatly contribute to ongoing efforts toward carbon neutrality.

中文翻译：

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通过哌嗪衍生醇胺中分子内胺的协同作用高效捕获二氧化碳

基于胺洗涤的化学吸收仍然是主要的二氧化碳2捕获过程。然而，传统胺类吸收剂的整体效率难以满足不断增长的CO需求2捕获。因此，开发强大的吸收剂以实现高效且具有成本效益的二氧化碳2捕获非常重要但具有挑战性。在这里，通过用氨乙基和羟烷基部分取代哌嗪（PZ）中的仲氨基，获得了一种具有改善的溶解度和稳定性的新型胺吸收剂。开发的胺吸收剂具有优异的CO2通过分子内胺的协同作用实现吸附/解吸能力，再生能耗低至2.56 GJ·t−1一氧化碳2。此外，CO 的增强2利用密度泛函理论计算和核磁共振分析阐明了捕获和相应的机制。这种新开发的胺吸收剂具有优异的CO2捕集性能预计将极大地促进碳中和的持续努力。