Enhanced ethanol recovery of PDMS mixed matrix membranes with hydrophobically modified ZIF-90
Enhanced ethanol recovery of PDMS mixed matrix membranes with hydrophobically modified ZIF-90
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DOI：
10.1016/j.seppur.2018.05.056
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发表时间：
2018-11
影响因子：
8.6
通讯作者：
Shengchao Xu;Hao Zhang;F. Yu;Xiaoxu Zhao;Yan Wang
中科院分区：
文献类型：
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作者：
Shengchao Xu;Hao Zhang;F. Yu;Xiaoxu Zhao;Yan Wang
在本研究中，合成了具有增强表面疏水性的十二烷基胺修饰的分子筛咪唑酸框架-90 （DLA-ZIF-90）颗粒，并将其掺入聚二甲基硅氧烷（PDMS）基质中，制备了新型的PDMS/DLA-ZIF-90混合基质膜（MMMs），用于通过渗透蒸发回收乙醇。通过各种表征技术研究了ZIF-90颗粒的成功修饰。研究了PDMS/ dla - zif - 90mm的形貌和理化性质。与未改性ZIF-90的PDMS MMM相比，PDMS/DLA-ZIF-90 MMM表现出更好的形貌均匀性和分离性能，这是由于ZIF-90- dla颗粒的柔性内部通道增强了吸附选择性，以及ZIF-90- dla颗粒与PDMS基质之间的亲和力提高。在60 °C条件下，负载2.5 wt%的DLA-ZIF-90的最佳通量为99.5 g m−2h−1，相应的分离因子为15.1。研究了操作温度的影响。性能基准测试表明，PDMS/DLA-ZIF-90 MMM具有优于大多数其他pms基膜的渗透蒸发性能，因此可能为开发用于有机回收的高性能zif基MMMs提供有价值的见解。
In this study, dodecylamine-modified zeolitic imidazolate framework-90 (DLA-ZIF-90) particles with enhanced surface hydrophobicity are synthesized and incorporated into the polydimethylsiloxane (PDMS) matrix to fabricate novel PDMS/DLA-ZIF-90 mixed matrix membranes (MMMs) for ethanol recovery via pervaporation. The successful modification of ZIF-90 particles is investigated via various characterization techniques. The morphology and physicochemical properties of the PDMS/DLA-ZIF-90 MMMs are studied and characterized. Compared to the PDMS MMM with unmodified ZIF-90, PDMS/DLA-ZIF-90 MMM exhibits enhanced morphology homogeneity and separation performance, contributed by the flexible inner channels of ZIF-90-DLA particles with enhanced adsorption selectivity, as well as the improved affinity between ZIF-90-DLA particles and PDMS matrix. The MMM with 2.5 wt% DLA-ZIF-90 loading shows the best performance with the optimal flux of 99.5 g m−2h−1and corresponding separation factor of 15.1 at 60 °C. The effect of operation temperature is also studied. The performance benchmarking shows that PDMS/DLA-ZIF-90 MMM exhibits superior pervaporation performance to most other PDMS-based membranes, and may therefore shed valuable insights to the development of high-performance ZIF-based MMMs for organic recovery.