Removal of zinc ions from aqueous solution using micellar-enhanced ultrafiltration at low surfactant concentrations

Micellar-enhanced ultrafiltration (MEUF) of zinc ions (Zn2+) from aqueous solutions using single anionic surfactant sodium dodecyl sulphate (SDS) at low critical micelle concentrations (cmc) (0.2Ã?cmc - 3Ã?cmc) was investigated. When the initial SDS concentration was below the cmc, unexpectedly high...

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Bibliographic Details
Published in:Water S. A. 2007-01, Vol.33 (1), p.129-136
Main Authors: Fang, Yao-Yao, Li, Jian-Bing, Zhang, Zhen, Zeng, Guang-Ming, Qu, Yun-Huan, Yang, Chun-Ping, Huang, Jin-Hui, Xu, Ke
Format: Article
Language:English
Subjects:
Biological and medical sciences
Concentration polarisation
Earth sciences
Earth, ocean, space
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Hydrology
Hydrology. Hydrogeology
Langmuir isotherm
Micellar-enhanced ultrafiltration
Micelle
Sodium dodecyl sulphate
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Summary:Micellar-enhanced ultrafiltration (MEUF) of zinc ions (Zn2+) from aqueous solutions using single anionic surfactant sodium dodecyl sulphate (SDS) at low critical micelle concentrations (cmc) (0.2Ã?cmc - 3Ã?cmc) was investigated. When the initial SDS concentration was below the cmc, unexpectedly high rejection (97.5%) was obtained due to concentration polarisation occurring near the membrane-solution interface. Based on this mechanism, the true rejection of the solute is no longer a function of the initial SDS concentration in the bulk solution but a function of the SDS concentration at the concentration polarisation layer. The removal of Zn2+ at low Zn2+ feed concentrations was very efficient. The characteristics of Zn2+ ion adsorption to surfactant micelle were also studied. The Langmuir model could be used to elucidate the Zn2+ adsorption isotherm to the SDS micelle. The study demonstrates the potential practicality of the MEUF technique for the removal of heavy metal ion pollutants such as Zn2+ at low surfactant concentrations.
ISSN:0378-4738