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Bulletin of Materials Science

, Volume 38, Issue 2, pp 565–572 | Cite as

Cetyltrimethylammonium bromide–silica membrane for seawater desalination through pervaporation

  • PUYAM S SINGH
  • SANJAY G CHAUDHRI
  • ANKIT M KANSARA
  • WILHELM SCHWIEGER
  • THANGARAJ SELVAM
  • STEPHANIE REUSS
  • VINOD K ASWAL
Article

Abstract

A simple preparation of mesostructured cetyltrimethylammonium bromide (CTAB)–silica membrane is reported. It effectively desalinates seawater to pure water through pervaporation separation process. The membrane thickness was of nanometer-length-scale obtained by deposition of CTAB–silica colloids on porous polysulfone support. Scanning electron microscopy (SEM), atomic force microscopy (AFM) and transmission electron microscopy (TEM) studies were performed to characterize the membrane while the structure of the colloids in coating solution was probed by small-angle neutron scattering (SANS). The prepared membranes exhibited excellent salt rejection efficiency of 99.9% in desalination of synthetic seawater of 40,000 ppm NaCl by pervaporation at 25C. The pure water flux was in the range of 1–2.6 kg m−2 h depending upon the membrane configuration and thickness. The flux could be greatly enhanced by operating the process at higher temperatures of 40–80C but it was at the cost of decreased salt-rejection efficiency. The initial rejection efficiency and flux of the membrane was found to be restored upon cooling the membrane back to room temperature.

Keywords

Seawater desalination cetyltrimethylammonium bromide–silica membrane pervaporation 

Notes

Acknowledgements

The financial assistance from Council of Scientific & Industrial Research (CSIR), India under the CSIR sponsored schemes of Raman Research Fellowship 2012–13 and CSIR-Empower project OLP-0048 and Bavarian Research Foundation, Germany are gratefully acknowledged. We thank Dr. Joachim Kohlbrecher, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland for the SANS measurements. A.M. Kansara is thankful to AcSIR for Ph.D. registration.

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Copyright information

© Indian Academy of Sciences 2015

Authors and Affiliations

  • PUYAM S SINGH
    • 1
    • 2
  • SANJAY G CHAUDHRI
    • 1
  • ANKIT M KANSARA
    • 1
    • 2
  • WILHELM SCHWIEGER
    • 3
  • THANGARAJ SELVAM
    • 3
  • STEPHANIE REUSS
    • 3
  • VINOD K ASWAL
    • 4
  1. 1.CSIR—Central Salt & Marine Chemicals Research Institute, RO Membrane DisciplineGujaratIndia
  2. 2.Academy of Scientific and Innovative Research (AcSIR-CSMCRI)GujaratIndia
  3. 3.Institute of Chemical Reaction EngineeringUniversity of Erlangen-NürnbergErlangenGermany
  4. 4.Bhabha Atomic Research Centre, Solid State Physics DivisionMumbaiIndia

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