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首页> 外文期刊>Journal of industrial and engineering chemistry >Flow synthesis of polycrystalline ZIF-8 membranes on polyvinylidene fluoride hollow fibers for recovery of hydrogen and propylene
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Flow synthesis of polycrystalline ZIF-8 membranes on polyvinylidene fluoride hollow fibers for recovery of hydrogen and propylene

机译：聚氟乙烯中空纤维对多晶ZIF-8膜的流动合成，用于回收氢气和丙烯

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摘要

It is highly desirable to prepare defect-free ZIF-8 membranes on commercially attractive scalable polymer hollow fibers, especially on the bore side of the fibers, yet quite challenging. Herein, we report a facile synthesis of well-intergrown ZIF-8 membranes on polyvinylidene fluoride (PVDF) microfiltration hollow fibers by a secondary growth method. Surface modification using a strong base promoted high heterogeneous nucleation, resulting in densely packed ZIF-8 seed layers on the hollow fibers. The seed crystals were secondarily grown under a continuous flow of growth solution to form ZIF-8 membranes with thickness of 1.2 mu m. The prepared ZIF-8 membranes achieved high gas permeances, reaching values of 16,344 x 10(-)(10) mol m(-2) s(-1) Pa-1 for H-2 and 197 x 10(-10) mol m(-2) s(-1) Pa-1 for C3H6. The selectivities for H-2/CH4, H-2/C3H6, H-2/C3H8 and C3H6/C3H8 gas pairs were found to be 12, 57, 160 and 15, respectively. We anticipate that the method could potentially be applied to transform commercial PVDF ultrafiltration/microfiltration hollow fibers commonly used for water separation into high quality ZIF-8 membranes for H-2 purification and C3H6/C3H8 separation. (C) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：非常希望在商业上有吸引力的可伸缩性聚合物中空纤维上制备无紫外ZIF-8膜，特别是在纤维的孔侧，但具有相当具有挑战性的。在此，我们通过二次生长方法报告了在聚偏二氟乙烯（PVDF）微滤中空纤维上的漂白型ZIF-8膜的容易合成。使用强碱的表面改性促进了高异质成核，在中空纤维上产生密集包装的ZIF-8种子层。在连续的生长溶液的连续流动下晶晶二次生长，形成厚度为1.2μm的ZIF-8膜。制备的ZIF-8膜达到高气体渗透性，达到H-2和197×10（-10）摩尔的16,344×10（ - ）（10）摩尔M（-2）S（-1）PA-1的值用于C3H6的M（-2）S（-1）PA-1。 H-2 / CH4，H-2 / C3H6，H-2 / C3H8和C3H6 / C3H8气体对的选择性分别为12,57,160和15。我们预期该方法可能适用于转化商业PVDF超滤/微滤中空纤维，通常用于水分离成高质量的ZIF-8膜，用于H-2纯化和C3H6 / C3H8分离。 （c）2020朝鲜工业与工程化学学会。 elsevier b.v出版。保留所有权利。

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