Shen Liang, Liu Wei, Lu Yanqiu, Fang Chenyi, Zhang Sui
Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117576, Singapore.
Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Resources and Environment, Southwest University, Chongqing, 400715, China.
Mater Horiz. 2023 Oct 2;10(10):4562-4570. doi: 10.1039/d3mh00798g.
A pervaporation membrane with fast and selective permeation is key to improving the recovery efficiency of volatile organic compounds from water. Here, we synthesize a new type of nanofiller-conjugated microporous polymer (CMP) to fabricate polydimethylsiloxane (PDMS)-based mixed matrix membranes (MMMs) and explore their application in the recovery of organic solvents from water pervaporation. Due to their good dispersibility in the dope solvent and compatibility with PDMS, uniform MMMs without discrete particle phases or aggregates are prepared. Interestingly, CMP nanosheets play a unique role as a nano-surfactant in enhancing both the sorption and diffusion coefficients, realizing unprecedented fast recovery of organic solvents from water. The total flux of the as-fabricated membranes can be enhanced from 74.8 to 406.2 kg μm h and the separation factor is increased from 118.7 to 526.6 when using 5 wt% ethyl acetate aqueous solution as the feed at 50 °C. In addition, the CMP-incorporated PDMS membranes are also effective in recovering a wide range of organic compounds from water, including ethanol, acetone, tetrahydrofuran and acetonitrile.
具有快速和选择性渗透的渗透汽化膜是提高从水中回收挥发性有机化合物效率的关键。在此，我们合成了一种新型的纳米填料共轭微孔聚合物（CMP），以制备基于聚二甲基硅氧烷（PDMS）的混合基质膜（MMM），并探索其在通过渗透汽化从水中回收有机溶剂中的应用。由于它们在铸膜溶剂中具有良好的分散性以及与PDMS的相容性，制备出了没有离散颗粒相或聚集体的均匀MMM。有趣的是，CMP纳米片在提高吸附和扩散系数方面起着独特的纳米表面活性剂作用，实现了前所未有的从水中快速回收有机溶剂。当在50°C下使用5 wt%的乙酸乙酯水溶液作为进料时，所制备膜的总通量可从74.8提高到406.2 kg μm h，分离因子从118.7提高到526.6。此外，掺入CMP的PDMS膜在从水中回收多种有机化合物（包括乙醇、丙酮、四氢呋喃和乙腈）方面也很有效。
