Frontiers of Chemical Science and Engineering

, Volume 10, Issue 4, pp 562–574 | Cite as

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

  • Baicang Liu
  • Chen Chen
  • Pingju Zhao
  • Tong Li
  • Caihong Liu
  • Qingyuan Wang
  • Yongsheng Chen
  • John Crittenden
Research Article

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.

Keywords

thin-film composite forward osmosis amphiphilic copolymer interfacial polymerization poly(ethylene glycol) 

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Copyright information

© Higher Education Press and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Baicang Liu
    • 1
    • 2
  • Chen Chen
    • 3
  • Pingju Zhao
    • 1
    • 2
  • Tong Li
    • 4
  • Caihong Liu
    • 5
  • Qingyuan Wang
    • 1
    • 2
  • Yongsheng Chen
    • 6
  • John Crittenden
    • 6
  1. 1.College of Architecture and EnvironmentSichuan UniversityChengduChina
  2. 2.Institute of New Energy and Low Carbon TechnologySichuan UniversityChengduChina
  3. 3.Litree Purifying Technology Co., LtdHaikouChina
  4. 4.Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijingChina
  5. 5.State Key Laboratory of Urban Water Resource and EnvironmentHarbin Institute of TechnologyHarbinChina
  6. 6.School of Civil and Environmental EngineeringGeorgia Institute of TechnologyAtlantaUSA

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