APTES改性ZIF-L/PEBA混合基质膜强化渗透汽化分离苯酚研究

渗透汽化(PV)膜分离是一种高效节能、无污染的化工分离技术，在有机废水处理领域的应用潜力巨大。以3-氨丙基三乙氧基硅烷(APTES)改性二维ZIF-L(AZLs)，将其引入聚醚嵌段酰胺(PEBA)内制备AZLs/PEBA混合基质膜，用于分离水溶液中的苯酚。系统表征了所制膜的微结构与物化特性，考察了APTES添加量、AZLs填充量、操作温度、料液浓度等对膜分离性能的影响。结果表明：AZLs均匀分散在PEBA基质中，表明两者具有良好的界面相容性。AZLs的加入使得膜疏水性增强而表面自由能降低，从而提高了PEBA膜的选择性。当分离80℃、1000 mg/kg苯酚水溶液时，AZLs/PEBA膜总通量可达2046 g/(m²·h)，分离因子为25.4，并且具有一定的稳定性。所制AZLs/PEBA混合基质膜在含酚废水处理方面具有应用前景。

APTES-modified ZIF-L/PEBA mixed matrix membranes for enhancing phenol perm-selective pervaporation

As an efficient, energy-saving, and pollution-free chemical separation technology, pervaporation(PV) has great application potential for organic wastewater treatment. In this study, the AZLs were synthesized by modifying two-dimensional ZIF-L with 3-aminopropyltriethoxysilane(APTES). The AZLs were incorporated into the poly(ether-block-amide)(PEBA) to prepare AZLs/PEBA mixed matrix membranes for phenol separation from aqueous solution. The membrane microstructures and physicochemical properties were characterized in detail. Effects of the APTES addition amount, AZLs loading, operating temperature, and feed concentration on separation performance of the membranes were investigated. The AZLs were uniformly dispersed within PEBA matrix, indicating their good interfacial compatibility. The addition of AZLs increased the hydrophobicity and reduced the surface free energy of PEBA membrane, thereby enhancing membrane selectivity. The AZLs/PEBA membrane had a total flux of 2046 g/(m²·h) and a separation factor of 25.4 in separating 1000 mg/kg phenol aqueous solution at 80℃. The AZLs/PEBA membrane also displayed a certain stability. The as-prepared AZLs/PEBA mixed matrix membranes were promising candidates in the phenolic wastewater treatment.