Facile fabrication of mixed matrix membranes from simultaneously polymerized hyperbranched polymer/modified graphene oxide for MTBE/MeOH separation
Facile fabrication of mixed matrix membranes from simultaneously polymerized hyperbranched polymer/modified graphene oxide for MTBE/MeOH separation
复制标题
由同时聚合的超支化聚合物/改性氧化石墨烯轻松制造混合基质膜，用于 MTBE/MeOH 分离
DOI：
10.1016/j.memsci.2018.04.051
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发表时间：
2018-08
影响因子：
9.5
通讯作者：
Shulan Ji
中科院分区：
文献类型：
--
作者：
Lin Wang;Naixin Wang;Hengyu Yang;Quanfu An;Bingbing Li;Shulan Ji
无机纳米膜在聚合物基质中的相容性和可分配性对混合基质膜的分离性能至关重要。利用有机化合物对无机纳米粒子进行表面修饰，可以减少纳米粒子的团聚，从而改善纳米粒子与聚合物基质的相容性。本研究通过静电作用，利用原位聚合的超支化聚(亚甲基双丙烯酰胺氨乙基哌嗪)(HPMA)对氧化石墨烯(GO)纳米片进行了改性。同时实现了GO的改性和HPMA的聚合。然后用HPMA修饰的GO纳米片通过真空辅助组装的方法在陶瓷管状衬底上制备了分离膜。通过红外光谱、拉曼光谱和核磁共振氢谱对HPMA分子和HPMA修饰GO纳米片的化学结构进行了表征。拉曼图谱表明，GO纳米片在聚合物基质中分散良好。将所制备的HPMA-GO复合膜用于渗透汽化分离甲基叔丁基醚(MTBE)/甲醇(MeOH)混合物。在40 °C下，当料液中甲醇含量为10 wt%时，膜的渗透通量和通量分别达到99.5 wt%和0.41 kg m 2 h−1。在120h的运行试验中，复合膜表现出良好的稳定性。因此，本研究提出的简便方法可以为MTBE/MeOH混合物的渗透汽化分离和其他应用提供一种新的制备混合基质膜的途径。
The compatibility and dispensability of inorganic nanofillers within a polymer matrix is crucial for the separation performance of mixed matrix membranes. Using organic compounds to modify the surface of inorganic nanoparticles is commonly used to reduce the agglomeration of nanoparticles and to therefore improve the compatibility between the nanoparticles and the polymer matrix. In this study, graphene oxide (GO) nanosheets were modified by in-situ polymerized hyperbranched poly (methylene bisacryl amide amino ethyl piperazine) (HPMA) through electrostatic interactions. The modification of GO and polymerization of HPMA were simultaneously achieved. The HPMA-modified GO nanosheets were then used to fabricate separation membranes on ceramic tubular substrates via a vacuum-assisted assembly method. The chemical structure of HPMA molecules and the HPMA-modified GO nanosheets were confirmed by FT-IR, Raman, and1H NMR spectroscopy. Raman mapping verified that the GO nanosheets were dispersed well in the polymer matrix. The HPMA-GO composite membranes thus prepared were used to separate methyltert-butyl ether (MTBE)/methanol (MeOH) mixture by pervaporation. The optimized MeOH content in permeation and flux could reach 99.5 wt% and 0.41 kg m−2h−1, respectively, when the feed MeOH content was 10 wt% at 40 °C. The composite membranes also showed a good stability in a 120-h running test. Therefore, the facile method presented in this study could provide a new avenue to fabricate mixed matrix membranes for pervaporation separation of MTBE/MeOH mixtures and other applications.
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