Carbon dioxide (CO2) capture technology is a prominent way to mitigate global climate change originating from the excessive emission of greenhouse gas CO2. The structural modification of adsorbents with amine is a new attractive strategy to enhance their CO2 adsorption efficiency under low pressure. The current work is looking to boost the CO2 uptake performance of Zeolitic imidazolate framework-8 (ZIF-8) impregnated with aminoethylethanolamine (AEEA) inside the porous network of crystalline ZIF-8 nanoparticles via the wet functionalization process due to the enormous surface area and remarkable thermally and chemical stability of ZIF-8. The parent ZIF-8 and amine incorporated ZIF-8 adsorbents were carefully synthesized and characterized by various approaches through HRXRD, Micro Raman, FTIR, FESEM, TEM, EDS, TGA, XPS, BET, and CHNS methods. The CO2 capture behaviour of materials was examined using the iSorb HP2 adsorption equipment under pressure and temperature swing circumstances, particularly within the spectrum of 0 to 30 bar and 25 to 80 °C. Response surface methodology (RSM) based on the Box-Behnken design (BBD) was exploited to design experiments and investigate the optimum conditions for the desirable response i.e. CO2 adsorption performance, which was affected by three distinct variables: temperature, CO2 partial pressure, and AEEA loading. Additionally, the CO2 adsorption was mathematically modeled using numerous isotherm models. The CO2 adsorption capacity (3.581 mmol/g) of the prime adsorbent 30 % AEEA treated ZIF-8 was highest among the amine incorporated ZIF-8 samples which was 4.15 times higher than that of the pure ZIF-8 material (0.862 mmol/g) at 25 °C/1 bar partial pressure.

中文翻译：

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通过氨基乙基乙醇胺功能化多孔 ZIF-8 纳米颗粒提高 CO2 吸附效率：实验研究、等温线和 RSM 建模


二氧化碳 （CO2） 捕集技术是缓解因温室气体 CO2 过度排放而引起的全球气候变化的重要方法。胺对吸附剂进行结构改性是一种新的有吸引力的策略，可以提高其在低压下的 CO2 吸附效率。由于 ZIF-8 的巨大表面积和显着的热和化学稳定性，目前的工作旨在通过湿功能化过程提高用氨基乙基乙醇胺 （AEEA） 浸渍的沸石咪唑酸盐框架 8 （ZIF-8） 在结晶 ZIF-8 纳米颗粒的多孔网络内的 CO2 吸收性能。母体 ZIF-8 和胺掺入的 ZIF-8 吸附剂通过 HRXRD、Micro Raman、FTIR、FESEM、TEM、EDS、TGA、XPS、BET 和 CHNS 方法通过各种方法进行表征。使用 iSorb HP2 吸附设备在压力和温度波动情况下检查材料的 CO2 捕获行为，特别是在 0 至 30 bar 和 25 至 80 °C 的范围内。 基于 Box-Behnken 设计 （BBD） 的响应面法 （RSM） 用于设计实验并研究理想响应的最佳条件，即 CO2 吸附性能，它受三个不同变量的影响：温度、CO2 分压和 AEEA 负载。此外，使用大量等温线模型对 CO2 吸附进行了数学建模。在 25 °C/1 bar 分压下，经 30 % AEEA 处理的初吞吸附剂 ZIF-8 的 CO2 吸附容量 （3.581 mmol/g） 在胺掺入的 ZIF-8 样品中最高，比纯 ZIF-8 材料 （0.862 mmol/g） 高 4.15 倍。