Environmental Science and Pollution Research Pub Date : 2023-12-29 , DOI: 10.1007/s11356-023-31399-3 Xuewen Chen 1 , Hongping Quan 1, 2, 3 , Jie Yu 1 , Yuling Hu 1 , Zhiyu Huang 1, 2, 3
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In order to reduce the impact of greenhouse gases on the environment, the development of various new CO2 capture materials has become a hot spot. In this work, a novel composite amine solid adsorbent was prepared by simultaneously using tetraethylenepentamine (TEPA) and 2-[2-(dimethylamino) ethoxy] ethanol (DMAEE) for amine functionalization on the polyester microsphere carrier. The introduction of methyl methacrylate (MMA) with high glass transition temperature into the polyester carrier makes the carrier microspheres have high hardness. At the same time, the carrier also contains active epoxy groups and hydrophobic glycidyl methacrylate (GMA, which can undergo ring-opening reaction with composite amines to achieve high-load and low-energy chemical grafting of amines on the carrier. The composite aminated polyester microspheres were used as an efficient adsorbent for CO2 in simulated flue gas. The results show that the synergistic effect of TEPA-DMAEE composite amine system in the adsorbent is beneficial to the improvement of CO2 capture capacity. When the total amine content in the impregnating solution is 45 wt% and the composite amine ratio is TEPA: DMAEE = 6: 4, the CO2 adsorption capacity can reach the optimal value of 2.45 mmol/ g at 70 °C. In addition, the composite amine microsphere adsorbent has cyclic regeneration performance. Importantly, through kinetic fitting, the Avrami kinetic model fits the CO2 adsorption better than the quasi-first-order and quasi-second-order kinetic models, which proves that physical adsorption and chemical adsorption coexist in the adsorption process. This simple, long-term stable and excellent selective separation performance makes amine-functionalized adsorbents have potential application prospects in CO2 capture.
Graphical abstract
中文翻译：
开发用于高效捕获二氧化碳的复合胺官能化聚酯微球
为了减少温室气体对环境的影响，各种新型CO 2捕获材料的开发成为热点。本工作采用四亚乙基五胺（TEPA）和2-[2-（二甲氨基）乙氧基]乙醇（DMAEE）同时在聚酯微球载体上进行胺功能化，制备了一种新型复合胺固体吸附剂。在聚酯载体中引入高玻璃化转变温度的甲基丙烯酸甲酯(MMA)，使得载体微球具有高硬度。同时，该载体还含有活性环氧基团和疏水性甲基丙烯酸缩水甘油酯（GMA），可与复合胺发生开环反应，实现胺在载体上的高负载、低能量化学接枝。微球作为模拟烟气中CO 2的高效吸附剂，结果表明，吸附剂中TEPA-DMAEE复合胺体系的协同作用有利于CO 2捕集能力的提高。当浸渍液质量分数为45wt%、复合胺配比为TEPA:DMAEE=6:4时,70℃时CO 2吸附容量可达到最佳值2.45mmol/g。此外,复合胺微球吸附剂具有循环性。重要的是，通过动力学拟合，Avrami动力学模型比准一级和准二级动力学模型更适合CO 2吸附，这证明了吸附过程中物理吸附和化学吸附并存。 这种简单、长期稳定且优异的选择性分离性能使得胺功能化吸附剂在CO 2捕集方面具有潜在的应用前景。
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