Impact of Shell Composition on Dye Uptake by Capsules of Ionic Liquid
Impact of Shell Composition on Dye Uptake by Capsules of Ionic Liquid
复制标题
壳成分对离子液体胶囊吸收染料的影响
DOI：
10.1021/acs.langmuir.2c02015
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发表时间：
2022
期刊：
影响因子：
3.9
通讯作者：
Pentzer, Emily
中科院分区：
文献类型：
--
作者：
Edgehouse, Katelynn;Starvaggi, Nicholas;Rosenfeld, Neil;Bergbreiter, David;Pentzer, Emily
离子液体的包封已被证明是一种有效的技术，以克服缓慢的传质速率和处理困难，从本体离子液体的高粘度。这些系统通常依赖于小分子通过包封材料（壳）扩散到IL核心中，因此壳的组成影响摄取性能。在此，我们报告了聚合物壳组合物对包封IL从水中摄取小分子染料甲基红的影响。通过在由氧化石墨烯（GO）纳米片稳定的乳液中的界面聚合制备具有1-己基-3-甲基咪唑鎓双（三氟磺酰基）酰亚胺（[Hmim][TFSI]）核的胶囊;使用不同的二胺和二异氰酸酯得到具有聚脲的胶囊壳，所述聚脲都是脂肪族、脂肪族/芳香族和脂肪族/极性非质子的。然后将这些胶囊添加到不同pH值的甲基红水溶液中，并通过紫外-可见光谱法监测染料向胶囊中的迁移，与单独的胶囊壳相比。无论聚合物的特性如何，观察到类似的染料吸收程度（在pH = 2时>90%），然而具有含有具有极性非质子键的聚脲的壳的胶囊需要更长的时间才能完成。这些研究表明，胶囊壳组成的微小变化可能导致小分子吸收的不同性能，从而深入了解如何针对特定应用（如溶剂修复和气体吸收）定制壳组成。
Encapsulation of ionic liquids (ILs) has been shown to be an effective technique to overcome slow mass transfer rates and handling difficulties that stem from the high viscosity of bulk ILs. These systems commonly rely on diffusion of small molecules through the encapsulating material (shell), into the IL core, and thus the composition of the shell impacts uptake performance. Herein, we report the impact of polymer shell composition on the uptake of the small molecule dye methyl red from water by encapsulated IL. Capsules with core of 1-hexyl-3-methylimidazolium bis(trifluorosulfonyl)imide ([Hmim][TFSI]) were prepared by interfacial polymerization in emulsions stabilized by graphene oxide (GO) nanosheets; the use of different diamines and diisocyanates gave capsule shells with polyureas that were all aliphatic, aliphatic/aromatic, and aliphatic/polar aprotic. These capsules were then added to aqueous solutions of methyl red at different pH values, and migration of the dye into the capsules was monitored by UV–vis spectroscopy, compared to the capsule shell alone. Regardless of the polymer identity, similar extents of dye uptake were observed (>90% at pH = 2), yet capsules with shells containing polyureas with polar aprotic linkages took longer to reach completion. These studies indicate that small changes in capsule shell composition can lead to different performance in small molecule uptake, giving insight into how to tailor shell composition for specific applications, such as solvent remediation and gas uptake.