Membrane and Water Treatment

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Dehydration and pore swelling effects on the transfer of PEG through NF membranes

  • Received : 2012.06.12
  • Accepted : 2013.03.15
  • Published : 2013.04.25
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Abstract

In order to investigate the significance of "salting-out" and "pore swelling" effects on the nanofiltration of neutral solutes, rejection properties of two NF ceramic and polymeric membranes were studied with single polyethyleneglycol (PEG) solution and mixed PEG/inorganic electrolyte solutions. For both membranes, the rejection rate of PEG was found to decrease significantly in the presence of ions. In the case of the ceramic membrane (rigid pores), this phenomenon was imputed to the sole partial dehydration of PEG molecules induced by the surrounding ions. This assumption was confirmed by the lowering of the PEG rejection rates which followed the Hofmeister series. Experimental data were used to compute the resulting decrease in the Stokes radius of PEG molecules in the presence of the various salts. Concerning the polymeric membrane, the decrease in the rejection rate was found to be systematically higher than for the ceramic membrane. The additional decrease was then ascribed to the swelling of the pores. The experimental data of rejection rates were then used to compute the variation in the mean pore radius in the presence of the various salts. The pore swelling phenomenon due to accumulation of counterions inside pores was supported by electrokinetic charge density measurements.

Keywords

References

  1. Afonso, M.D., Hagmeyer, G. and Gimbel, R. (2001), "Streaming potential measurements to assess the variation of nanofiltration membranes surface charge with the concentration of salt solutions", Sep. Purif. Technol., 22-23, 529-541. https://doi.org/10.1016/S1383-5866(00)00135-0
  2. Bargeman, G., Vollenbroek, J.M., Straatsma, J., Schroën, C.G.P.H. and Boom, R.M. (2005), "Nanofiltration of multi-component feeds. Interactions between neutral and charged components and their effect on retention", J. Membr. Sci., 247(1-2), 11-20. https://doi.org/10.1016/j.memsci.2004.05.022
  3. Bouchoux, A., Roux-de Balmann, H. and Lutin, F. (2005), "Nanofiltration of glucose and sodium lactate solutions: variations of retention between single-and mixed solute solutions", J. Membr. Sci., 258(1-2), 123-132. https://doi.org/10.1016/j.memsci.2005.03.002
  4. Bouranene, S., Szymczyk, A., Fievet, P. and Vidonne, A. (2007), "Influence of inorganic electrolytes on the retention of polyethyleneglycol by a nanofiltration ceramic membrane", J. Membr. Sci., 290(1-2), 216-221. https://doi.org/10.1016/j.memsci.2006.12.031
  5. Bruni, L. and Bandini, S. (2008), "The role of the electrolyte on the mechanism of charge formation in polyamide nanofiltration membranes", J. Membr. Sci., 308(1-2), 136-151. https://doi.org/10.1016/j.memsci.2007.09.061
  6. Fievet, P., Sbai, M., Szymczyk, A. and Vidonne, A. (2003), "Determining the ζ-potential of plane membranes from tangential streaming potential measurements: Effect of the membrane body conductance", J. Membr. Sci., 226(1-2), 227-236. https://doi.org/10.1016/j.memsci.2003.09.007
  7. Hunter, R.J. (1981), Zeta potential in Colloid Science, Principles and Applications, Academic Press, San Diego, CA, USA.
  8. Kunz, W., Henle, J. and Ninham, B.W. (2004), "Zur Lehre von der Wirkung der Salze (about the science of the effect of salts): Franz Hofmeister's historical papers", Curr. Opin. Colloid Interface Sci., 9(1-2), 19-37. https://doi.org/10.1016/j.cocis.2004.05.005
  9. Labbez, C., Fievet, P., Szymczyk, A., Aoubiza, B., Vidonne, A. and Pagetti, J. (2001), "Theoretical study of the electrokinetic and electrochemical behaviors of two-layer composite membranes", J. Membr. Sci., 184(1), 79-95. https://doi.org/10.1016/S0376-7388(00)00611-6
  10. Luo, J. and Wan, Y. (2011), "Effect of highly concentrated salt on retention of organic solutes by nanofiltration polymeric membranes", J. Membr. Sci., 372(1-2), 145-153. https://doi.org/10.1016/j.memsci.2011.01.066
  11. Mandale, S. and Jones, M. (2008), "Interaction of electrolytes and non-electrolytes in nanofiltration", Desalination, 219(1-3), 262-271. https://doi.org/10.1016/j.desal.2007.06.005
  12. Schaep, J., Vandecasteele, C., Wahab Mohammad, A. and Bowen, W.R. (2001). "Modelling the retention of ionic components for different nanofiltration membranes", Sep. Purif. Technol., 22-23, 169-179. https://doi.org/10.1016/S1383-5866(00)00163-5
  13. Szymczyk, A., Fatin-Rouge, N. and Fievet, P. (2007), "Tangential streaming potential as a tool in modelling of ion transport through nanoporous membrane", J. Colloid Interface Sci., 309(2), 154-160.
  14. Yaroshchuk, A.E., Boiko, Y.P. and Makovetskiy, A.L. (2002), "Filtration potential across membranes containing selective layers", Langmuir, 18(13), 5154-5162. https://doi.org/10.1021/la025503s
  15. Zydney, A.L. (1997), "Stagnant film model for concentration polarization in membrane systems", J. Membr. Sci., 130(1-2), 275-281. https://doi.org/10.1016/S0376-7388(97)00006-9

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