Highly flexible and robust self-standing covalent organic framework (COF) membranes with rapid preparation are important but technically challenging for achieving precise separation. Herein , a novel imine-based 2D soft covalent organic framework (SCOF) membrane with a large area of 226.9 cm 2 , via ingeniously selecting an aldehyde flexible linker and a trigonal building block, is reported. The soft 2D covalent organic framework membrane is rapidly formed (≈5 min) based on the sodium dodecyl sulfate (SDS) molecular channel constructed at the water/dichloromethane (DCM) interface, which is the record-fast SCOF membrane formation and 72 times faster than that in the reported literature. MD simulation and DFT calculation elucidate that the dynamic, self-assembled SDS molecular channel facilitates faster and more homogeneous transfer of amine monomers in the bulk, thereby forming a soft 2D self-standing COF membrane with more uniform pores. The formed SCOF membrane exhibits superb sieving capability for small molecules, robustness in strong alkaline (5 mol L −1 NaOH), acid (0.1 mol L −1 HCl), and various organic solutions, and sufficient flexibility with a large curvature of 2000 m −1 for membrane-based separation science and technology.
To remove carbamazepine (CBZ) from aqueous environment, the method of using activated carbon fiber as a cathode with enhanced electric/ferric iron/peroxydisulfate (ACF-E/ Fe 3+ /PDS) process was studied. The highest CBZ removal ratio of 97.76% was achieved in 30 min, which was unchanged after 10 cycles of ACF in the ACF-E/Fe 3+ /PDS process. Meanwhile, the concentration of total iron ions in the effluent decreased as it was deposited on the ACF surface. The results of free radical inhibition experiments revealed that sulfate radical (SO 4 −• ) played the leading role in the removal of CBZ. Compared with the E/Fe 3+ /PDS process, the electrical energy consumption was significantly reduced by 8 times in the ACF-E/Fe 3+ /PDS process. In addition, the toxicities of CBZ and its byproducts were reduced in the ACF-E/ Fe 3+ /PDS process by the toxicity test. Therefore, the ACF-E/Fe 3+ /PDS process can be used as a sustainable, efficient, and lowtoxicity method for the treatment of pollutants in water.
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