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聚合物支撑的柔性有机二氧化硅杂化膜的制备与异丙醇脱水应用研究

作者：李亚楠¹，廖明佳²，龚耿浩¹

单位： 1天津工业大学材料科学与工程学院，分离膜与膜过程国家重点实验室，天津 300387；2重庆化工职业学院，重庆401228

关键词：聚砜支撑膜；桥联型有机二氧化硅，流延法；蒸汽渗透；异丙醇脱水

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2021,41(6):27-34

摘要：

以1, 2-二（三乙氧基硅基）乙烷（BTESE）为硅源前驱体，通过溶胶-凝胶法在多孔聚合物基底上沉积桥联微孔有机二氧化硅活性分离层，制得高性能聚合物支撑的柔性有机二氧化硅“层杂化”膜。采用场发射扫描电子显微镜（SEM）、傅里叶变换衰减全反射红外光谱仪（ATR-FTIR）与X射线光电子能谱仪（XPS）等手段系统的考察了支撑体孔径大小以及有机二氧化硅溶胶浓度对有机二氧化硅层的形貌以及杂化硅微孔网络的影响。随后，该膜应用于异丙醇/水混合液（异丙醇：90 wt%）的蒸汽渗透脱水。研究发现，通过改变溶胶浓度和基膜孔径，可有效调控柔性有机二氧化硅“层杂化”膜的结构与成膜质量，最终获得具有高性能的柔性有机二氧化硅杂化膜。结果表明，随着BTESE溶胶浓度的增加，BTESE层厚度呈线性增加，溶胶浓度为5 wt%时，BTESE层厚约300 nm，分离因子最高可达1200，水通量约为1.77 kg/（m2 h）。此外，聚合物基膜的孔径尺寸也明显影响有机二氧化硅活性层在其上的沉积量并最终影响该膜的分离性能。

Using 1,2-bis(triethoxysilyl)ethane(BTESE) as a single precursor, an organosilica layer with high perm-selectivity was successfully deposited onto a porous polymer substrate via scalable sol-gel flow-induced deposition method. The effect of pore sizes of supports and concentrations of BTESE sol for the morphology of BTESE layer and nanoscale hybrid organosilica networks were examined using SEM, ATR-FTIR and XPS. In addition, the layered hybrid membranes were applied to the vapor permeation dehydration of isopropanol–water (90/10 wt%) solutions at 105℃. We investigated the influence of pore sizes of supports and concentrations of BTESE sol for the formation of the organosilica layer that covered the porous polymeric supports. We found that the thickness of BTESE layer increased linearly with an increase in concentration of BTESE sols. The layered membrane demonstrated a water flux of 1.77 kg m−2h−1 and a separation factor of 1200 when using BTESE sol with concentration of 5 wt%, whose thickness was 500 nm. Also, different pore sizes of polymeric supports exerted on the formation of the BTESE layer along with the effect on membrane performance.

基金项目：

天津市自然科学基金（18JCYBJC43300）；天津市科技计划项目（20ZYJDJC00100）；重庆市教育委员会科学技术研究基金（KJQN201904501）

作者简介：

李亚楠（1995-），女，山东德州市人，硕士生，研究方向为柔性有机二氧化硅复合膜的制备及其应用，E-mail：naumlee@163.com

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