Enhanced Ethanol Separation by Corona-Modified Surface MWCNT Composite PDMS/PES.PVP Membrane
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Ethanol separation factor and total flux for a fabricated composite polydimethylsiloxane/polyethersulfone polyvinylpyrrolidone (PDMS/PES.PVP) membrane in the pervaporation process were obtained at 6.25 and 440 g/m2 h, respectively. In order to improve the separation of ethanol as a renewable resource from water, the composite PDMS surface was modified by corona treatment, and the treated surface was coated by multi-walled carbon nanotubes (MWCNTs). Implementation of corona treatment for surface modification leads to enhancement in the ethanol separation factor using a MWCNT surface-coated membrane. Based on the obtained data, for a corona time of 6 min and corona input power of 360 W, the ethanol separation factor was improved from 6.25 to 9.3 and also a total flux of 280 g/m2 h was obtained. Therefore, application of the novel fabricated PDMS/PES.PVP composite membrane with surface modification by corona treatment and MWCNT coating in the pervaporation process at the desired condition has significantly improved the ethanol separation factor (48.8%).
Authors gratefully acknowledge Biotechnology Research Lab., Noshirvani University of Technology, and the Rangin Plast Company for the facilities provided to conduct the present research. Also, special thanks are extended to the Nezhadgholi and Alizadeh Foundation (Babol, Iran) for the financial support of the present research through a research grant.
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