Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education, College of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China.
College of Chemistry, Zhengzhou University, Zhengzhou 450001, Henan, China.
Langmuir. 2023 Feb 21;39(7):2729-2738. doi: 10.1021/acs.langmuir.2c03217. Epub 2023 Feb 7.
A decrease in CO emissions is urgently required in the present situation due to the fast growth of carbon dioxide (CO) in the atmosphere, which has caused a series of global climate issues. This study used an impregnation-evaporation method to immobilize an amino functionalized ionic liquid [COHmim][Lys] on a chromatographic column filler GDX-103 and create a novel supported ionic liquid. The results showed that the supported ionic liquid with 60 wt % ionic liquid content had the best adsorption performance at 40 °C, and the CO adsorption isotherm showed that the adsorption capacity at 0.1 MPa was 1.29 mmol CO/g sorbent, which was 6 times greater than the adsorption capacity of the pure carrier. The sample with 60% ionic liquid content has an adsorption capacity of 1.02 mmol CO/g sorbent under the condition of CO/N mixed gas with 10% CO content. This is 43 times greater than the adsorption capacity of the pure carrier, and its adsorption performance is stable after three adsorption and desorption cycles. Through the rich porous structure of GDX-103, the ionic liquid is effectively supported and dispersed, which expands the contact area between CO and ionic liquid and enhances the mass transfer of CO. At the same time, CO can be chemically bound to the groups on the anion of ionic liquid and be immobilized, so it has a high selective adsorption capacity of CO, which makes it a great alternative to traditional CO adsorbents.
由于大气中二氧化碳（CO）的快速增长导致了一系列全球气候问题，目前迫切需要减少 CO 排放。本研究采用浸渍蒸发法将氨基功能化离子液体[COHmim][Lys]固定在色谱柱填料 GDX-103 上，制备了一种新型的负载型离子液体。结果表明，在 40°C 时，负载型离子液体中离子液体含量为 60wt%时具有最佳的吸附性能，CO 吸附等温线表明在 0.1MPa 下的吸附容量为 1.29mmol CO/g 吸附剂，是纯载体的 6 倍。在 60%离子液体含量的样品中，在 CO 含量为 10%的 CO/N 混合气条件下，吸附容量为 1.02mmol CO/g 吸附剂，是纯载体的 43 倍，且经过三次吸附和解吸循环后，其吸附性能稳定。通过 GDX-103 的丰富多孔结构，有效支撑和分散了离子液体，扩大了 CO 与离子液体的接触面积，增强了 CO 的传质。同时，CO 可以与离子液体阴离子上的基团发生化学结合并被固定，因此对 CO 具有高选择性吸附容量，是传统 CO 吸附剂的理想替代品。
