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Thin-film composite forward osmosis membranes with substrate layer composed of polysulfone blended with PEG or polysulfone grafted PEG methyl ether methacrylate

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Abstract

To advance commercial application of forward osmosis (FO), we investigated the effects of two additives on the performance of polysulfone (PSf) based FO membranes: one is poly(ethylene glycol) (PEG), and another is PSf grafted with PEG methyl ether methacrylate (PSf-g-PEGMA). PSf blended with PEG or PSf-g-PEGMA was used to form a substrate layer, and then polyamide was formed on a support layer by interfacial polymerization. In this study, NaCl (1 mol∙L–1) and deionized water were used as the draw solution and the feed solution, respectively. With the increase of PEG content from 0 to 15 wt-%, FO water flux declined by 23.4% to 59.3% compared to a PSf TFC FO membrane. With the increase of PSf-g-PEGMA from 0 to 15 wt-%, the membrane flux showed almost no change at first and then declined by about 52.0% and 50.4%. The PSf with 5 wt-% PSf-g-PEGMA FO membrane showed a higher pure water flux of 8.74 L∙m–2∙h–1 than the commercial HTI membranes (6–8 L∙m–2∙h–1) under the FO mode. Our study suggests that hydrophobic interface is very important for the formation of polyamide, and a small amount of PSfg-PEGMA can maintain a good condition for the formation of polyamide and reduce internal concentration polarization.

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Correspondence to Baicang Liu.

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Liu, B., Chen, C., Zhao, P. et al. Thin-film composite forward osmosis membranes with substrate layer composed of polysulfone blended with PEG or polysulfone grafted PEG methyl ether methacrylate. Front. Chem. Sci. Eng. 10, 562–574 (2016). https://doi.org/10.1007/s11705-016-1588-9

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  • DOI: https://doi.org/10.1007/s11705-016-1588-9

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