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Membrane Water Treatment   Volume 2, Number 3, July 2011, pages 137-145
Surfactant enhanced filtration performances of monochlorophenol isomers through low-pressure membrane
Yogesh Kumar, H. Brahmbhatt, G. S. Trivedi and A. Bhattacharya

Abstract     [Buy Article]
    Membrane processes are major breakthrough for the removal of organic pollutants in water remediation. The separations of solutes depend on nature of the membranes and solutes. The separation performance depends on the nature of the solutes (i.e., molecular volume, polarity, and hydrophobicity) for the same membrane. As 4-chlorophenol is of more dipolemoment compared to 2-chlorophenol, the orientation of the molecule enables it pass through the pores of the membrane, which is of negatively charged and thus separation order follows: 2-chlorophenol > 4-chlorophenol. Hydrophobicity factor also supports the order. Addition of sodium dodecyl sulfate (SDS) to chlorophenol solution shows remarkable increase in separation performance of the membrane. The improvement in separation is 1.8 and 1.5 times for 4- and 2- chlorophenol consecutively in case of 0.0082 M SDS (1cmc = 0.0082 M) in the solution. 4-chlorophenol has better attachment tendency with SDS because of its relatively more hydrophobic nature and thus reflects in performance i.e. the separation performance of 4-chlorophenol with SDS through the membrane is better compared to 2-chlorophenol.
Key Words
    thin film composite; membrane; surfactant; chlorophenol; hydrophobicity
Reverse Osmosis Discipline, Central Salt and Marine Chemicals Research Institute
(Council of Scientific and Industrial Research), G. B. Marg, Bhavnagar-364021, Gujarat, India

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