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Citation: Li Yu-Hong, Zhao Kong-Shuang, Hikida Takumi. Dielectric Spectroscopy and Its Analysis for the System of Reverse Osmosis Membrane UTC-70 in Aqueous Solution[J]. Acta Physico-Chimica Sinica, ;2003, 19(06): 523-527. doi: 10.3866/PKU.WHXB20030609 shu

Dielectric Spectroscopy and Its Analysis for the System of Reverse Osmosis Membrane UTC-70 in Aqueous Solution

1.
1Department of Chemistry,Beijing Normal University,Beijing　100875; Japan Science and Technology Corporation,Kawaguchi,Japan

Received Date: 28 November 2002
Available Online: 15 June 2003

This paper reported the dielectric properties of the reverse osmosis membrane UTC-70 in NaCl and KCl aqueous solution of different concentrations,studied by dielectric relaxation theory of bilamellar structure.The membrane/aqueous systems had an interfacial polarization behavior that their conductance and capacity displayed a sudden increasing and decreasing in the frequency range of 103～104 Hz.The dielectric parameters of the systems were obtained by nonlinear curve fitting.The relaxation intensity and the characteristic relaxation frequency increasd with the electrolyte concentration supporting the theory of the interfacial polarization.Furthermore,the dielectric characteristics of the systems was analyzed and the phase parameters including the dielectric constant and the conductivity of the membrane were obtained.It was found that the reverse osmosis membrane UTC-70 had a very low density of permanent negative charges.In electrolytes of low concentration the membrane behaved like an ion-exchange membrane.The conductivity ratio of the membrane phase to the aqueous phase first decreased and then approched to a constant as the electrolyte concentration increasesd.This is attributed to the Donnan effect of the permanent charges in the membrane.
- Dielectric spectroscopy;Reverse osmosis membrane UTC-70;Interfacial polarization;Conductivity
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