Abstract Aiming to improve the gas diffusion in ionic liquid (IL) and give full play to the selectivity of IL for CO2 sorption, dispersed 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]), tri-n-butyl propyl phosphonium succinimide ([P4443][SUC]) and tri-n-butyl propyl phosphonium iminodiacetic acid ([P4443]2[IDA]) droplets as core materials were encapsulated in silica gel, polysulfone and polystyrene by sol-gel method, solvent evaporation and suspension polymerization method to form the novel microcapsules containing ionic liquid. The microcapsules were evaluated by infrared analysis, thermogravimetry, morphology and CO2/N2 sorption. It is concluded that the preparation method and IL type have a great influence on loading amount and morphology, which further affect CO2 sorption. The IL-based microcapsules display irregular or spherical particles and contain relatively high amounts of ionic liquid (~60–70 wt%) by sol-gel method and suspension polymerization. Encapsulated ionic liquid materials have the better CO2 sorption capacity and CO2/N2 selectivity than the supporters, especially phosphonium ionic liquid ([P4443][SUC]) microcapsules prepared by sol-gel method. The loss of CO2 sorption capacity is only about 0.104 wt% after being recycled for 8 times. Additionally, CO2 sorption kinetics of the ionic liquid microcapsules follow pseudo-second-order model and microcapsules have a drastic increase in mass transfer rate.

中文翻译：

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用于 CO2 捕获的封装离子液体

摘要 为提高离子液体（IL）中的气体扩散能力，充分发挥离子液体对CO2吸附的选择性，分散六氟磷酸1-丁基-3-甲基咪唑鎓（[BMIM][PF6]）、三正丁基丙基以鏻琥珀酰亚胺（[P4443][SUC]）和三正丁基丙基鏻亚氨基二乙酸（[P4443]2[IDA]）液滴为核心材料，采用溶胶-凝胶法、溶剂蒸发法将其包裹在硅胶、聚砜和聚苯乙烯中悬浮聚合法形成新型含离子液体微胶囊。通过红外分析、热重分析、形态学和 CO2/N2 吸附来评估微胶囊。结论是制备方法和IL类型对负载量和形貌有很大影响，进而影响CO2的吸附。基于 IL 的微胶囊通过溶胶-凝胶法和悬浮聚合显示出不规则或球形颗粒，并含有相对大量的离子液体（~60-70 wt%）。包封的离子液体材料比载体具有更好的CO2吸附能力和CO2/N2选择性，尤其是通过溶胶-凝胶法制备的鏻离子液体（[P4443][SUC]）微胶囊。循环使用 8 次后，CO2 吸附能力的损失仅为 0.104 wt% 左右。此外，离子液体微胶囊的 CO2 吸附动力学遵循伪二级模型，微胶囊的传质速率急剧增加。包封的离子液体材料比载体具有更好的CO2吸附能力和CO2/N2选择性，尤其是通过溶胶-凝胶法制备的鏻离子液体（[P4443][SUC]）微胶囊。循环使用 8 次后，CO2 吸附能力的损失仅为 0.104 wt% 左右。此外，离子液体微胶囊的 CO2 吸附动力学遵循伪二级模型，微胶囊的传质速率急剧增加。包封的离子液体材料比载体具有更好的CO2吸附能力和CO2/N2选择性，尤其是通过溶胶-凝胶法制备的鏻离子液体（[P4443][SUC]）微胶囊。循环使用 8 次后，CO2 吸附能力的损失仅为 0.104 wt% 左右。此外，离子液体微胶囊的 CO2 吸附动力学遵循伪二级模型，微胶囊的传质速率急剧增加。