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CO_(2)渗透通量和对CO_(2)/CH_(4)的选择性.与纯膜相比,掺杂质量分数为10%时,混合基质膜的CO_(2)渗透通量可达269.3Barrer,提高了29.3%,CO_(2)/CH_(4)的选择性由18.5提高到43.8,并且膜性能至少可保持40h的稳定性.由本方法制备的ZIF-8-Bim-Ica/Pebax混合基质膜对CO_(2)的选择性较高,在CO_(2)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 CO_(2)permeation flux and the CO_(2)/CH_(4) selectivity of the mixed matrix membranes.Compared with the pure membrane,the CO_(2)permeation flux of the mixed matrix membrane with 10%doping amount can reach 269.3 Barrer,increased by 29.3%,and the CO_(2)/CH_(4) 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 CO_(2),showing a good application prospect in the field of CO_(2)gas separation.
作者
赵新
乔志华
孙玉绣
郭翔宇
仲崇立
ZHAO Xin;QIAO Zhihua;SUN Yuxiu;GUO Xiangyu;ZHONG Chongli(State Key Laboratory of Separation Membranes and Membrane Processes,School of Chemical Engineering and technology,Tiangong University,Tianjin 300387,China)
出处
《膜科学与技术》
CAS
CSCD
北大核心
2021年第5期11-16,25,共7页
Membrane Science and Technology
基金
天津市科技计划项目(19PTSYJC00020)。
