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    Structural parameters reduction in polyamide forward osmosis membranes via click modification of the polysulfone support

    Year: 2020

    Journal: Colloid Surf. A-Physicochem. Eng. Asp., Volume 585, JAN 20

    Authors: Zhou, Jin; He, Heng-Li; Sun, Fei; Su, Yu; Yu, Hai-Yin; Gu, Jia-Shan

    Organizations: National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21371008]; key research project of Anhui provincial education department [KJ2019A0867]

    Keywords: Forward osmosis; Thin-film composite polyamide membrane; Methoxypolyethylene glycol; Click chemistry; Internal concentration polarization; Structural parameter

    To reduce the structural parameter of composite polyamide (PA) forward osmosis membrane, the support polysulfone (PSf) was prepared by blending PSf/PSf-g-methoxypolyethylene glycol (PSf/PSf-g-mPEG) with the mPEG weight molecular weights of 200, 500, 1000 and 1900 g/mol at the PSf/PSf-g-mPEG weight ratios of 4:1 and 9:1, respectively. The composite membranes were prepared as the following steps: (1) propargyl mPEGs preparation; (2) chloromethylation and azidation of PSf; (3) PSf-g-mPEG preparation via click chemistry; (4) PSf/PSf-g-mPEG blended support membrane preparation by phase separation; (5) polyamide active layer formation through interfacial polymerization between phenylenediamine and 1,3,5-benzenetricarbonyl trichloride on the support membrane. The successful synthesis of the polymers and preparation of the composite membranes were certified with Fourier transform infrared spectroscopy, nuclear magnetic resonance, X-ray photoelectron spectroscopy analysis, field emission scanning electron microscope and energy dispersive spectrometer. The pure water fluxes of the blended support membranes were sharply increased; the maximum pure water flux was gained for the PSf/PSf-g-mPEG500 blended membrane. For the composite polyamide (PA) membrane, the water flux was improved drastically, while the rejection to the salt remained unchanged in the reverse osmosis system; the pure water flux rose dramatically and the structure parameter (S) dropped significantly in the forward osmosis system.
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