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Surface segregation of fluorinated modifying macromolecule for hydrophobic/hydrophilic membrane preparation and application in air gap and direct contact membrane distillation

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Essalhi, M. and Khayet Souhaimi, Mohamed (2012) Surface segregation of fluorinated modifying macromolecule for hydrophobic/hydrophilic membrane preparation and application in air gap and direct contact membrane distillation. Journal of membrane science, 417 . pp. 163-173. ISSN 0376-7388

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Official URL: http://dx.doi.org/10.1016/j.memsci.2012.06.028


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Abstract

A fluorinated surface modifying macromolecule (SMM) was synthesized and blended into the casting solution of polyetherimide used as host polymer. A composite porous hydrophobic/hydrophilic membrane was prepared by the phase inversion technique in a single casting step. The membrane was characterized by different techniques. During membrane formation, SMM migrates to the top membrane surface increasing its hydrophobicity and decreasing its pore size, nodule size and roughness parameters. The thickness of the porous hydrophobic top layer was found to be around 4 mu m. The membrane was used for desalination by air gap membrane distillation and direct contact membrane distillation. The experiments were performed for different sodium chloride aqueous solutions and various operating conditions. The water production rate was found to be high for direct contact membrane distillation because of the low resistance to mass transport achieved by the diminution of the water vapour transport path length through the hydrophobic thin top-layer of the membrane.


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Additional Information:

© 2012 Elsevier B.V. M. Essalhi is thankful to Middle East Desalination Research Centre (MEDRC) for the grant (Project 06-AS-02). The authors acknowledge the I+D+I Project MAT2010-19249 (Spanish Ministry of Science and Innovation). M. Khayet would like to thank Prof. Matsuura for his help and fruitful discussions.

Uncontrolled Keywords:Hydrophobic ceramic membranes; Atomic-force microscopy; Hollow-fiber membranes; Composite membranes; Fluoride membranes; Desalination; Water; Layer; Optimization; Enhancement
Subjects:Sciences > Physics > Thermodynamics
ID Code:25994
Deposited On:27 Jun 2014 07:05
Last Modified:14 Mar 2016 15:35

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