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Ultrafiltration of surfactant solutions
Radosław Urbański1, Elzbieta Góralska, Hans-Joerg Bart
1Institute of Chemical Technology and Engineering, Poznań University of Technology, Pl. Skłodowskiej-Curie 2, 60-965 Poznań, Poland.
Journal of Colloid and Interface Science
|November 18, 2005
Summary
Hexadecyltrimethylammonium bromide (CTAB) and alkylpolyglucoside (APG) surfactants are suitable for ultrafiltration, showing high permeability and low secondary resistance. Sodium dodecyl sulfate (SDS) is less suitable due to gel layer formation and high resistance.
Area of Science:
- Colloid and Surface Science
- Membrane Science and Technology
Background:
- Ultrafiltration is a key separation process for colloid solutions.
- Surfactant properties significantly impact membrane performance.
Purpose of the Study:
- To evaluate the ultrafiltration behavior of hexadecyltrimethylammonium bromide (CTAB), sodium dodecyl sulfate (SDS), and alkylpolyglucoside (APG) through hydrophilic membranes.
- To determine the effects of experimental conditions on permeate flux and secondary resistance.
Main Methods:
- Ultrafiltration of surfactant solutions using regenerated cellulose membranes (10,000 mol wt cut-off).
- Analysis of permeate flux, secondary resistance, and surfactant concentration in permeate.
- Investigation of electrolyte effects on ultrafiltration.
Main Results:
- CTAB and APG demonstrated high permeability and low secondary resistance, indicating suitability for ultrafiltration.
- SDS exhibited poor performance due to gel layer formation and high secondary resistance.
- Electrolytes had a minor negative impact on ultrafiltration fluxes, except for SDS solutions.
Conclusions:
- CTAB and APG are effective surfactants for ultrafiltration, offering high flux and low fouling.
- SDS is not recommended for ultrafiltration under the studied conditions due to significant membrane fouling.
- Surfactant migration and concentration polarization are critical factors affecting ultrafiltration efficiency.