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Chelation–assisted in situ self-assembly route to prepare the loose PAN–based nanocomposite membrane for dye desalination

Liu, Songbai, Wang, Zhan, Ban, Min, Song, Peng, Song, Xufeng, Khan, Bushra
Journal of membrane science 2018 v.566 pp. 168-180
artificial membranes, desalination, filtration, gentian violet, hydrolysis, magnesium chloride, metal ions, nanocomposites, permeability, polyacrylonitrile, polyethyleneimine, silver chloride, sodium chloride, sodium sulfate, succinic acid, vitamin E
In this work, we presented a facile and novel strategy, chelation–assisted in situ self-assembly, to prepare the loose polyacrylonitrile (PAN)–based nanocomposite membrane for dye desalination. Based on the chelate reaction polyethyleneimine (PEI) with metal ions, an Ag⁺–PEI complex layer was deposited onto the hydrolyzed PAN surface. Then, the chelate complex layer was served as the templates to in-situ synthesize the vitamin E succinate (VES)-functionalized AgCl nanoparticles,which were uniformly distributed on the membrane surface and provided additional transport pathways for water molecules. The prepared nanocomposite membrane achieved the permeability of 106.4, 101.2 and 92.3 L m⁻² h⁻¹ MPa⁻¹, which was 20–50% higher in comparison with that of the pure Ag⁺–PEI@HPAN membrane, with corresponding rejections of 99.2%, 99.5% and 99.8% to crystal violet, acid fuchsin and congo red solution at the concentration of 0.1 g L⁻¹. Meanwhile, this membrane possessed a low inorganic salts rejection (6.2%, 9.6% 8.3% and 12.8% for MgCl2, NaCl, MgCl2 and Na2SO4) and good stability during the 60 h filtration of dye-salt mixture. We anticipate that this novel route could be applied to prepare the polymer-supported nanocomposite membrane with enhanced separation performance.