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