Functionalized ZIF-7/Pebax® 2533 mixed matrix membranes for CO2/N2 separation
Functionalized ZIF-7/Pebax® 2533 mixed matrix membranes for CO2/N2 separation
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DOI：
10.1016/j.micromeso.2020.110030
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发表时间：
2020-05-01
影响因子：
5.2
通讯作者：
Li, Yanshuo
中科院分区：
文献类型：
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作者：
Gao, Jie;Mao, Haizhuo;Li, Yanshuo
基于膜的分离技术已发展成为一种从烟气（主要是 N-2）中捕集 CO2 的竞争方法。为了实现高分离性能，成功合成了三种部分NH2-、OH-和CH3OH-功能化的混合连接剂-ZIF-7，并将其掺入聚醚嵌段酰胺(Pebax (R) 2533)聚合物中形成混合基质膜(MMM)。 CO2吸附等温线证明，在ZIF-7骨架中引入官能团确实有利于CO2吸附。所有由 ZIF7-NH2、ZIF-7-OH 和 ZIF-7-CH3OH 组成的 MMM 均比母体 ZIF-7-Pebax (R) 2533 膜提供更好的 CO2/N-2 分离性能，表明功能化 ZIF-7 填料对气体分离性能的积极影响。在三种基于 ZIF-7 的功能化 MMM 中，ZIF-7-OH-Pebax MMM 表现出最佳的 CO2/N-2 分离性能，这可能归因于理想吸附溶液理论 (LAST) 对 ZIF-7-OH 填料预测的 CO2 相对于 N-2 的最高吸附选择性。 14% ZIF-7-OH-Pebax MMM 显示出高达 273 Barrer 的 CO2 渗透性和 38 的 CO2/N-2 分离因子，与纯 Pebax 膜相比分别提高了 60% 和 145%。制备对CO2具有强亲和力的功能化MOFs的策略为开发用于高效CO2分离的MMMs提供了有效的方法。
Membrane-based separation technology has evolved as a competitive approach for CO2 capture from flue gas (mainly N-2). To achieve high separation performance, three partially NH2-, OH- and CH3OH- functionalized mixed-linker-ZIF-7 were successfully synthesized, and incorporated into polyether-block-amide (Pebax (R) 2533) polymer to form mixed-matrix membranes (MMMs). As evidenced by the CO2 adsorption isotherms, introducing functional groups in the ZIF-7 framework was indeed beneficial for CO2 adsorption. All MMMs composed of ZIF7-NH2, ZIF-7-OH and ZIF-7-CH3OH offered better CO2/N-2 separation performance than the parent ZIF-7-Pebax (R) 2533 membrane, suggesting the positive effect of functionalized ZIF-7 fillers on the gas separation performance. Among the three functionalized ZIF-7 based MMMs, the ZIF-7-OH-Pebax MMMs exhibited the best performance for CO2/N-2 separation, which might be ascribed to the highest adsorption selectivity of CO2 over N-2 predicted by ideal adsorbed solution theory (LAST) for ZIF-7-OH fillers. The 14% ZIF-7-OH-Pebax MMM showed high CO2 permeability of 273 Barrer and CO2/N-2 separation factor of 38, which increased by 60% and 145% as compared with the neat Pebax membrane. The strategy of preparing functionalized MOFs with strong affinity for CO2 provides an effective method to develop MMMs for highly efficient CO2 separation.