Cao Hui, Jiang Ziyue, Tang Jing, Zhou Qiong
College of New Energy and Materials, China University of Petroleum, Beijing 102249, China.
The Experimental High School Attached to Beijing Normal University, Beijing 102249, China.
Polymers (Basel). 2023 Dec 1;15(23):4600. doi: 10.3390/polym15234600.
Composite polymolecular separation membranes were prepared by combining multi-branched ZIF-L with high-porosity electrospinning nanofibers PI. Meanwhile, PDA and PEI were introduced into the membrane in order to improve its adhesion. The new membrane is called the "PI@PDA@PEI/ZIF-L-4" composite membrane. Compared with the PI@PDA@PEI/ZIF-8 composite membrane, the new membrane's filtration rates for heavy metal ions such as Cd, Cr, and Pb were increased by 7.0%, 6.6%, and 9.3%, respectively. Furthermore, the new membrane has a permeability of up to 1140.0 L·m·h·bar, and displayed a very stable performance after four repeated uses. The separation mechanism of the PI@PDA@PEI/ZIF-L composite membrane was analyzed further in order to provide a basis to support the production of separation membranes with a high barrier rate and high flux.
通过将多支化的ZIF-L与高孔隙率的静电纺丝纳米纤维PI相结合，制备了复合多分子分离膜。同时，将PDA和PEI引入到膜中以提高其附着力。这种新膜被称为“PI@PDA@PEI/ZIF-L-4”复合膜。与PI@PDA@PEI/ZIF-8复合膜相比，新膜对Cd、Cr和Pb等重金属离子的过滤速率分别提高了7.0%、6.6%和9.3%。此外，新膜的渗透率高达1140.0 L·m·h·bar，并且在四次重复使用后表现出非常稳定的性能。进一步分析了PI@PDA@PEI/ZIF-L复合膜的分离机理，以便为支持生产具有高阻隔率和高通量的分离膜提供依据。
