AI Article Synopsis
- Traditional piperazine-based polyamide membranes have a trade-off between selectivity (ability to separate different molecules) and permeance (how fast liquids pass through), which new macrocycle membranes aim to improve.
- The study introduces three macrocyclic building blocks (2N, 3N, and 4N) to create polyamide membranes with nanoscale pores through interfacial polymerization, showing that the 4N-based membranes outperformed the others in both permeance and molecular weight cutoff.
- The resulting covalent organic network membranes demonstrated excellent performance in filtering and stability against fouling, making them promising for applications like wastewater treatment and precise molecular separation.
Article Abstract
Traditional piperazine-based polyamide membranes usually suffer from the intrinsic trade-off relationship between selectivity and permeance. The development of macrocycle membranes with customized nanoscale pores is expected to address this challenge. Herein, we introduce 1,4-diazacyclohexane (2N), 1,4,7-triazacyclononane (3N), and 1,4,8,11-tetraazacyclotetradecane (4N) as molecular building blocks to construct the nanoarchitectonics of polyamide membranes prepared from interfacial polymerization (IP). The permeance of covalent organic network membranes follows the trend of 4N-TMC > 3N-TMC > 2N-TMC, while the molecular weight cutoff (MWCO) also follows the same trend of 4N-TMC > 3N-TMC > 2N-TMC, according to their nanopore size of the membranes. The microporosity, orientation, and surface chemistry of covalent organic network membranes can be rationally designed by macrocycle building units. The ordered nanoarchitectonics allows the membranes to attain an excellent performance in graded molecular sieving. Importantly, the novel covalent organic network membranes with tunable nanoarchitectonics prepared from macrocycle building units exhibited high water permeance (32.5 LMH/bar) and retained long-term stability after 100 h of test and bovine serum albumin fouling. These results reveal the enormous potential of 3N-TMC and 4N-TMC membranes in saline textile wastewater treatments and precise molecular sieving.
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| http://dx.doi.org/10.1021/acsami.3c17579 | DOI Listing |
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