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Polyelectrolyte adsorption study on polyethersulfone membrane during polymer-enhanced ultrafiltration by electrochemical impedance spectroscopy

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Abstract

Electrochemical impedance spectroscopy (EIS) was used to study the fouling produced due to the adsorption of poly(vinyl sulfonic acid) on polyethersulfone membrane during metal ion recovery by polymer-enhanced ultrafiltration (PEUF). A solution of PVSA (40 mM in monomeric unit and pH 3.0, 4.5, and 6.0) was placed in a ultrafiltration cell, and then a stream of metal ions (2.0 mM in Co2+, Ni2+, Cu2+, Zn2+, Cd2+, and Pb2+) was passed from reservoir to cell. Fouled membranes were studied by EIS at low and intermediate frequencies. Measurements of hydrodynamic permeability and ATR-FTIR spectra were also obtained. Different relaxation processes were observed with characteristic frequencies (f 0) ~ 78 kHz and f 0 ~ 3562 kHz for active layer and clean membrane, respectively, while the frequencies for the fouled membrane f 0 = ~79.4 and f 0 = ~2511.9 kHz (pH 3.0). The value of f 0 could not be defined at pH 6.0. The relaxation times obtained were in the order of ×10−5 and ×10−3 s approximately for all cases. Our results suggest that relaxation mechanisms, at intermediate frequencies, can mainly be associated to polarization processes or to the migration of charge carriers.

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Acknowledgments

The authors thank FONDECYT (Grants No. 1070542 and 1061018) and CIPA for financial support; M. Palencia acknowledges to “Comisión Nacional de Investigación, Ciencia y Tecnología” (CONYCT-Chile) and “Centro de Investigación de Polímeros Avanzados” (CIPA-Chile) for partial financing of the Ph.D. Thesis.

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Authors and Affiliations

  1. Department of Polymer, Faculty of Chemistry, University of Concepción, Casilla 160-C, Concepción, Chile

    M. Palencia & B. L. Rivas

  2. Department of Analytic and Inorganic Chemistry, University of Concepción, Casilla 160-C, Concepción, Chile

    E. Pereira

  3. Group of Development and Application of New Materials, Pontificia Bolivariana University, Montería, Colombia

    A. Arrieta

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  1. M. Palencia
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  2. B. L. Rivas
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  3. E. Pereira
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  4. A. Arrieta
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Correspondence to B. L. Rivas.

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Palencia, M., Rivas, B.L., Pereira, E. et al. Polyelectrolyte adsorption study on polyethersulfone membrane during polymer-enhanced ultrafiltration by electrochemical impedance spectroscopy. Polym. Bull. 65, 145–156 (2010). https://doi.org/10.1007/s00289-009-0236-7

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  • DOI: https://doi.org/10.1007/s00289-009-0236-7

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