Functionalized
Graphene Sheets Embedded in Chitosan
Nanocomposite Membranes for Ethanol and Isopropanol Dehydration via
Pervaporation
Suhas
P. Dharupaneedi
Raghu V. Anjanapura
Jeong
M. Han
Tejraj M. Aminabhavi
10.1021/ie502751h.s001
https://acs.figshare.com/articles/journal_contribution/Functionalized_Graphene_Sheets_Embedded_in_Chitosan_Nanocomposite_Membranes_for_Ethanol_and_Isopropanol_Dehydration_via_Pervaporation/2254273
Pervaporation 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.
2014-09-17 00:00:00
alternative membrane separation process
contact angle
FGS
surface hydrophilicity
mixture
distillation technique
nanocomposite membrane
chitosan membranes
profilometry techniques
water molecules
Diffusion values
XRD
wt
ethanol
energy demand
isopropanol
solution processable nanocomposite membranes
water selectivity
SEM
Chitosan Nanocomposite Membranes
functionalized graphene sheets
pervaporative dehydration
Functionalized Graphene Sheets
Arrhenius activation energy parameters
membrane tortuosity
chitosan matrix
Isopropanol Dehydration
separation factor