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

Author:
Liu, Songbai, Wang, Zhan, Ban, Min, Song, Peng, Song, Xufeng, Khan, Bushra
Source:
Journal of membrane science 2018 v.566 pp. 168-180
ISSN:
0376-7388
Subject:
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
Abstract:
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.
Agid:
6134443