ZIF-67/PEBA杂化膜分离水中乙酸乙酯

ZIF-67/PEBA Hybrid membranes for ethyl acetate separation from aqueous solutions

为了提升从水溶液中回收乙酸乙酯的渗透汽化分离效率,将疏水ZIF-67颗粒填充到聚醚共聚酰胺(PEBA)中,制备得到ZIF-67/PEBA杂化膜。通过扫描电镜(SEM)、能谱(EDS)、接触角测量、傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)、热重(TGA)和溶胀度测试等手段对ZIF-67和杂化膜的物理化学性质进行表征,通过渗透汽化实验考察ZIF-67质量分数、进料质量分数和温度对膜分离性能的影响。结果表明ZIF-67与PEBA基质之间为物理共混,杂化膜疏水性增强。随着ZIF-67质量分数的增加,总渗透通量先降低后升高,分离因子先升高后降低,当ZIF-67质量分数为5%时分离因子最高;随着进料质量分数或温度增加,总渗透通量和分离因子均增加,最大总渗透通量为2299g·m^(-2)·h^(-1),最大分离因子为122。研究为渗透汽化技术工业化应用提供了必要的基础数据和理论依据。

Hydrophobic ZIF-67 incorporated hybrid poly(ether-block-amide)(PEBA)membranes were prepared in order to improve their pervaporation performance for the recovery of ethyl acetate from aqueous solutions.The physical and chemical properties of ZIF-67 and ZIF-67/PEBA hybrid membranes were studied by SEM,EDS,contact angle measurement,FTIR,XRD,TGA and swelling experiments.The effects of ZIF-67 concentration,feed concentration and temperature on the membrane performance was systematically investigated,which revealed only physical interaction between ZIF-67 and PEBA matrix,and the hydrophobicity of the ZIF-67/PEBA hybrid membranes was higher than that of the pristine PEBA membrane.With the increase of ZIF-67 loading content,the total flux decreased initially and then increased while the maximum separation factor was obtained at 5%ZIF-67 loading.With increasing feed concentration and feed temperature,the total flux and separation factor increased with the maximum values of 2299 g×m^(-2)×h^(-1) and 122,respectively.This study can provide necessary basic information and theoretical basis for the industrialization of pervaporation techniques for ethyl acetate separation from aqueous solutions.