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Title: Influence of hydrophobicity on retention in nanofiltration of aqueous solutions containing organic compounds
Authors: Braeken, Leen ×
Ramaekers, Rita
Zhang, Y
Maes, Guido
Van der Bruggen, Bart
Vandecasteele, Carlo #
Issue Date: Jan-2005
Publisher: Elsevier science bv
Series Title: Journal of membrane science vol:252 issue:1-2 pages:195-203
Abstract: This paper investigates the influence of molecular size and hydrophobicity of dissolved organic compounds in aqueous solution on retention. In a first part, the influence of hydrophobicity was investigated for organic molecules with a similar molecular weight below the molecular weight cut-off (MWCO) of the membrane and a different hydrophobicity, expressed by the logarithm of the octanol-water partition coefficient (log P). A good correlation was found between the hydrophobicity and the retention: molecules with a high log P (hydrophobic) generally had a low retention, while molecules with a negative log P (hydrophilic) showed a high retention. This could be explained by hydration of the molecules. In a second part, the correlation between the retention of molecules with a molecular weight above the MWCO of the membrane and their hydrophobicity was studied. It was found that a high hydrophobicity lowers the retention, but the influence of hydrophobicity decreases if the molecular size (compared to the MWCO of the membrane) increases. Finally, the influence of adsorption on retention was investigated. An increase in permeate concentration and thus a decrease of the corresponding retention, as a function of time, was observed for hydrophobic compounds, until saturation of the membrane was reached (steady-state retention). (c) 2004 Elsevier B.V. All rights reserved.
URI: 
ISSN: 0376-7388
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Process Engineering for Sustainable Systems Section
Chemistry - miscellaneous
Quantum Chemistry and Physical Chemistry Section
Sustainable Chemical Process Technology TC, Technology Campus Diepenbeek
Sustainable Chemical Process Technology TC
× corresponding author
# (joint) last author

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