A mixed matrix membrane for butanol pervaporation based on micron-sized silicalite-1 as macro-crosslinkers
A mixed matrix membrane for butanol pervaporation based on micron-sized silicalite-1 as macro-crosslinkers
复制标题
基于微米级Silicalite-1作为大交联剂的丁醇渗透汽化混合基质膜
DOI：
10.1016/j.memsci.2017.03.052
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发表时间：
2017-07-01
影响因子：
9.5
通讯作者：
Tan, Tianwei
中科院分区：
文献类型：
--
作者：
Hu, Song;Ren, Wenqiang;Tan, Tianwei
在此，我们报告了一种用于制造用于从稀水溶液中回收丁醇的有效膜的方法，该方法使用表面改性的硅沸石-1的微米级颗粒作为聚二甲基硅氧烷（PDMS）基质内的宏观交联剂。在这项工作中，硅沸石-1的纳米和微米尺寸的颗粒合成和表面改性的烷氧基硅烷的范围内的混合基质膜（MMM）的制造，以尽量减少不希望的空隙。此外，Silicalite-1颗粒在MMM中具有双重功能，不仅提供高选择性的传输通道，而且在成膜过程中与PDMS的羟基反应。将微米级正丙基三甲氧基硅烷（PTMS）改性的silicalite-1以63wt%的负载量掺入PDMS膜中，获得了最高的分离性能。在55 ℃下从1.5wt%的水溶液中分离正丁醇时，获得了72.9的高分离因子和1156 g/m2·h的归一化总通量。与纯PDMS膜相比，分离因子和正丁醇通量分别提高了83.6%和19.7%。最重要的是，具有非常高的分离因子和通量，这里开发的优化的混合基质渗透蒸发膜可以使经济上可行的从发酵原料生产正丁醇。
Herein, we report a method for the fabrication of an efficient membrane for butanol recovery from dilute aqueous solution using micron-sized particles of surface modified silicalite-1 as macro-crosslinkers within a polydimethylsiloxane (PDMS) matrix. In this work, silicalite-1 of nano-and micron-sized particles were synthesized and surface modified with a range of alkyloxysilanes in the fabrication of mixed matrix membranes (MMMs) in order to minimize the undesirable voids. Moreover, silicalite-1 particles in MMMs have a double function which not only provided transport channels of high selectivity, but also reacted with the hydroxyl groups of PDMS during membrane formation. The highest separation performance was obtained by incorporating micron-sized n-propyltrimethoxysilane (PTMS)-modified silicalite-1 into the PDMS membrane at a loading of 63 wt%. A high separation factor of 72.9 and a normalized total flux of 1156 g/m(2)h were obtained in separating n-butanol from a 1.5 wt% aqueous solution at 55 degrees C. Compared to the pure PDMS membrane, the separation factor and normalized butanol flux were increased by 83.6% and 19.7%, respectively. Most importantly, having a very high separation factor and flux, the optimized mixed matrix pervaporation membrane developed here may enable the economically viable production of n-butanol from fermentation feedstock.