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Functionalized Graphene Sheets Embedded in Chitosan Nanocomposite Membranes for Ethanol and Isopropanol Dehydration via Pervaporation
journal contribution
posted on 2014-09-17, 00:00 authored by Suhas
P. Dharupaneedi, Raghu V. Anjanapura, Jeong
M. Han, Tejraj M. AminabhaviPervaporation is an important alternative
membrane separation process
compared to the distillation technique, and a relatively high separation
factor is required to lower the energy demand. Solution processable
nanocomposite membranes prepared by incorporating functionalized graphene
sheets (FGS) loaded in various concentrations into the chitosan matrix
have been employed for the pervaporative dehydration of ethanol and
isopropanol. Incorporation of FGS leads to an increase of surface
hydrophilicity of the chitosan membranes along with an increase in
membrane tortuosity that was favorable to the selective permeation
of water molecules. The nanocomposite membrane containing 2.5 wt %
FGS gave the highest selectivities of 7781 and 1093 for isopropanol–water
and ethanol–water mixtures, respectively, when tested for 10
wt % water-containing feed mixture. Membranes were characterized by
wide-angle XRD, SEM, contact angle, and optical profilometry techniques.
The Flory–Huggins theory was employed to estimate the polymer–solvent
interaction parameter. Diffusion values and Arrhenius activation energy
parameters provided quantitative evidence for the observed increase
in water selectivity at higher loading of FGS.
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Keywords
alternative membrane separation processcontact angleFGSsurface hydrophilicitymixturedistillation techniquenanocomposite membranechitosan membranesprofilometry techniqueswater moleculesDiffusion valuesXRDwtethanolenergy demandisopropanolsolution processable nanocomposite membraneswater selectivitySEMChitosan Nanocomposite Membranesfunctionalized graphene sheetspervaporative dehydrationFunctionalized Graphene SheetsArrhenius activation energy parametersmembrane tortuositychitosan matrixIsopropanol Dehydrationseparation factor
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