机械化学法合成多配体MOF填料用于高效CO2分离 |
作者:赵新,乔志华,孙玉绣,郭翔宇,仲崇立 |
单位: 天津工业大学省部共建分离膜与膜过程国家重点实验室,化学工程与技术学院,天津 300387 |
关键词: 机械化学法;ZIF-8-Bim-Ica;多配体;混合基质膜;CO2分离 |
DOI号: |
分类号: TQ 028.8 |
出版年,卷(期):页码: 2021,41(5):11-16 |
摘要: |
以ZIF-8为母体材料通过机械化学手段引入苯并咪唑(Bim)和咪唑-2-甲醛(Ica)两种配体,得到多配体的MOF材料ZIF-8-Bim-Ica。与聚醚共聚酰胺(Pebax-1657)混合制得混合基质膜(MMMs)。利用XRD、FT-IR、核磁共振氢谱等方法确定了ZIF-8-Bim-Ica的化学结构,利用SEM对混合基质膜的断面进行表征。结果表明,引入Bim和Ica配体后,ZIF-8的结构没有被破坏,ZIF-8-Bim-Ica颗粒均匀分散于Pebax聚合物中。加入ZIF-8-Bim-Ica提高了混合基质膜的CO2渗透通量和对CO2/CH4的选择性。与纯膜相比,掺杂量为10 wt%时,混合基质膜的CO2渗透通量可达269.3 Barrer,提高了29.3 %,CO2/CH4的选择性由18.5提高到43.8,并且膜性能至少可保持40 h的稳定性。由本方法制备的ZIF-8-Bim-Ica/Pebax混合基质膜对CO2的选择性较高,在CO2气体分离领域展现出良好的应用前景。 |
ZIF-8 was synthesized by mechanization method. With ZIF-8 as the parent,the mixed ligands MOF material ZIF-8-Bim-Ica was obtained by mechanochemical means to introduce benzimidazole (Bim) and 2-Imidazolecarboxaldehyde (Ica). Mixed matrix membranes (MMMS) was prepared by mixing with polyether copolyamide (Pebax-1657). The chemical structure of ZIF-8-Bim-Ica was determined by XRD,FTIR and 1H NMR spectra,and the cross section of the mixed matrix membranes were characterized by SEM. The results showed that the structure of ZIF-8 was not damaged after the introduction of Bim and Ica, and the ZIF-8-Bim-Ica particles were evenly dispersed in the Pebax polymer. The addition of ZIF-8-Bim-Ica improved the CO2 permeation flux and the CO2/CH4 selectivity of the mixed matrix membranes. Compared with the pure membrane,the CO2 permeation flux of the mixed matrix membrane with 10 wt% doping amount can reach 269.3 Barrer,increased by 29.3 %,and the CO2/CH4 selectivity is increased from 18.5 to 43.8,and the stability of the membrane can be maintained for at least 40 hours. The ZIF-8-Bim-Ica/Pebax mixed matrix membranes prepared by this method has a high selectivity to CO2,showing a good application prospect in the field of CO2 gas separation. |
基金项目: |
天津市科技计划项目(19PTSYJC00020) |
作者简介: |
赵新(1995-),男,河北衡水人,硕士研究生,主要研究方向为气体分离膜的制备,Email:zhaoxintgd@163.com |
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