Tham Hui Min, Japip Susilo, Hua Dan, Chung Tai-Shung
NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore, 117456, Singapore.
Department of Chemical&Biomolecular Engineering, National University of Singapore, Singapore, 117585, Singapore.
ChemSusChem. 2018 Aug 9;11(15):2612-2619. doi: 10.1002/cssc.201800740. Epub 2018 Jul 10.
Ultrafiltration-level polyacrylonitrile (PAN) flat sheet membranes were chemically modified through cross-linking and hydrolysis to provide a suitable surface for the growth of a selective layer composed of a Zn benzene-1,4-dicarboxylic acid (Zn(BDC)) metal-organic framework (MOF). Unlike typical membrane modification methods or conventional MOF synthesis procedures, deionized (DI) water was the only solvent used for each of the modification steps. To better understand the layer-by-layer MOF growth process, several MOF growth conditions were also studied, including the effects of solution concentration, growth temperature, membrane immersion time and the number of layers. Subsequently, organic solvent nanofiltration (OSN) was used to test the effectiveness of the modifications and compare the performances of the fabricated membranes. With the appropriate combination of the MOF growth conditions, the layer-by-layer method was used to produce an OSN membrane with an isopropanol permeance of 2.39 L m h bar and an 86 % rejection of the dye Brilliant Blue R (M 825.97 g mol ).
通过交联和水解对超滤级聚丙烯腈（PAN）平板膜进行化学改性，以提供一个适合由锌苯-1,4-二甲酸（Zn(BDC)）金属有机框架（MOF）组成的选择层生长的表面。与典型的膜改性方法或传统的MOF合成程序不同，去离子水（DI）是每个改性步骤中唯一使用的溶剂。为了更好地理解逐层MOF生长过程，还研究了几种MOF生长条件，包括溶液浓度、生长温度、膜浸泡时间和层数的影响。随后，使用有机溶剂纳滤（OSN）来测试改性的有效性，并比较所制备膜的性能。通过MOF生长条件的适当组合，采用逐层法制备了一种有机溶剂纳滤膜，其对异丙醇的渗透通量为2.39 L m⁻² h⁻¹ bar⁻¹，对染料亮蓝R（分子量825.97 g mol⁻¹）的截留率为86%。
