DES changed the diffusion rate of amine monomer to prepare high-performance composite reverse osmosis membrane
Among the commonly used methods to improve the performance of composite films,interfacial polymerization(IP),a key step to regulate the formation of composite films,is a simple and effective method,however,the influence of deep eutectic solvents in the process of interfacial polymerization is relatively rare,and a polyamide composite reverse osmosis membrane is prepared by introducing deep eutectic solvents(DES with a molar ratio of 1∶2)into the interfacial polymerization process.The structure and physicochemical properties of composite films were characterized by Fourier infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),field emission scanning electron microscopy(SEM)and atomic force microscopy(AFM).The effect of DES addition on the performance of reverse osmosis membrane was investigated,and the effect of viscosity on the diffusion rate of amine monomer was systematically analyzed.When the DES addition amount was 5％,the composite membrane had the best comprehensive performance,with a flux of 63L/(m2·h)and a retention rate of 99％.The results showed that the incorporation of DES reduced the surface roughness,hydrophilicity and electronegativity,and increased the flux of the composite reverse osmosis membrane modified by DES compared with the unmodified composite membrane.This work was of great significance for the preparation of high-performance composite membranes.
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