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Membrane Water Treatment
  Volume 3, Number 1, January 2012 , pages 25-34

New CPS-PPEES blend membranes for CaCl2 and NaCl rejection
Chitrakar Hegde, Arun M Isloor, Mahesh Padaki, Ahmad Fauzi Ismail and Lau W.J

    Carboxylated polysulfone (CPS), poly (1,4-phenylene ether ethersulfone) (PPEES), membranes were prepared and used for the separation of NaCl and CaCl2, in efficient way with less energy consumption. In this work, nanofiltration and reverse osmosis membranes were employed to the salt rejection behavior of the different salt solutions. The influence of applied pressure (1-12 bar), on the membrane performance was assessed. In CM series of membranes, CM1 showed maximum of 97% water uptake and 36% water swelling, whereas, CM4 showed 75% water uptake and 28% water swelling. In RCM series, RCM1 showed 85% water uptake and 32% water swelling whereas, in RCM4 it was 68% for water uptake and 20% for water swelling. Conclusively reverse osmosis membranes gave better rejection whereas nanofiltration membrane showed enhanced flux. CM1 showed 58% of rejection with 12 L/(m2 h) flux and RCM1 showed 55% of rejection with 15 L/(m2 h) flux for 0.1 wt.% NaCl solution. Whereas, in 0.1 wt.% CaCl2 solution, membrane CM1 showed 78% of rejection with 12 L/(m2 h) flux and RCM1 showed 63% rejection with flux of 9 L/(m2 h).
Key Words
    carboxylated polysulfone; NF; RO; synthesis; rejection
Chitrakar Hegde : Department of Chemistry, Nitte Meenakshi Institute of Technology, Yelahanka, Bangalore-64, India
Arun M Isloor, Mahesh Padaki : Membrane Technology Division, Department of Chemistry, National Institute of Technology-Karnataka, Surathkal, Mangalore 575 025, India
Ahmad Fauzi Ismail and Lau W.J : Advanced Membrane Science & Technology Centre (AMTEC), Universiti Teknologi Malaysia,
81310 UTM, Skudai, Johor, Malaysia

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