• 关键词：离子液体固载  介孔SiO₂  混合基质膜  CO₂膜分离  气体渗透

• 基金项目：国家自然科学基金资助项目（No. 22078291）； 浙江省自然科学基金资助项目（No. LY19B060004）

• 黄肖星
• 浙江工商大学， 环境科学与工程学院，杭州 310012

• 张珂
• 浙江工商大学， 环境科学与工程学院，杭州 310012

• 吴礼光
• 浙江工商大学， 环境科学与工程学院，杭州 310012

• 王挺
• 浙江工商大学， 环境科学与工程学院，杭州 310012

• 摘要：为提升混合基质膜对CO₂的气体分离性能，将具有良好CO₂吸附特性能的离子液体首先固载于介孔SiO₂中，而后将该复合材料掺杂到 聚酰亚胺高分子中构建高效分离CO₂的混合基质膜.研究结果表明，固载离子液体主要进入介孔SiO₂的孔道内部，但当绝大部分介孔孔道被离子液体填满后，过多离子液体在SiO₂颗粒外围形成连接.由于离子液体对CO₂优异的吸附性能，其固载后介孔SiO₂对CO₂的吸附性能得到的显著提升，这进一步增强了固载离子液体的介孔SiO₂掺杂混合基质膜对CO₂气体的捕获，随着混合基质膜中离子液体固载量增加其CO₂渗透性能也明显提升.但当固载离子液体加入量达到1.0 g时，固载离子液体的介孔SiO₂在PI高分子中出现了团聚，其CO₂渗透性能反而下降.IL@C-SiO₂-2/PI膜的渗透性能和对CO₂的渗透选择性都达到最佳，其对CO₂/N₂理想选择性可达到30.

• Abstract：To enhance the CO₂ separation performance of mixed matrix membrane （MMM）， the ionic liquid （IL） with good CO₂ adsorption properties was first immobilized in mesoporous SiO₂， and then the composite material was doped into polyimide polymer to construct a MMM for efficient CO₂ separation. The results showed that the immobilized IL mainly entered the inside pores of mesoporous SiO₂. When most of the mesoporous pores were filled with ILs， excess ILs would form connectors around the mesoporous SiO₂. Due to the excellent adsorption performance of ILs for CO₂， the adsorption for CO₂ of mesoporous SiO₂ was significantly improved after IL immobilization， which further enhanced the CO₂ capture by the resulting MMMs incorporating IL@SiO₂-doped. With the increase of IL addition in the MMMs， the CO₂ permeation performance of the resulting MMMs was also improved. However， when the added amount of IL reached 1.0 g， the IL immobilized mesoporous SiO₂ agglomerated in the PI polymer， thus decreasing the CO₂ permeability of the resulting MMMs. The permeation performance and ideal selectivity of IL@C-SiO₂-2/PI membrane reached the best value， and its ideal selectivity for CO₂/N₂ could reach 30.

• Key words：ionic liquid immobilization  mesoporous SiO₂  mixed matrix membrane  CO₂ membrane separation  gas permeation

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