Technical Papers
May 27, 2022

Synthesis of Hybrid PVDF–PTFE Membrane Using Nonhazardous Solvent for Ethanol–Water Separation through Membrane Distillation

Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 26, Issue 4

Abstract

This work was focussed on synthesizing a polyvinylidene fluoride (PVDF)–polytetrafluoroethylene (PTFE) hybrid flat sheet membrane using a nonhazardous solvent dimethyl sulfoxide (DMSO) for ethanol–water separation via vacuum membrane distillation (VMD). The base polymer (PVDF) concentrations were varied from 12 wt% to 16 wt% and the copolymer (PTFE) loading were ranged from 1 wt% to 2 wt% (e.g., 1.0 wt%, 1.5 wt%, and 2.0 wt%). The morphological characteristics, porosity, and contact angle (CA) were examined for the synthesized membranes. An increased CA was observed when PTFE loading was increased in the dope solution. The addition of PTFE to the dope solution efficiently diminished the formation of micro voids and increased the hydrophobicity of the membrane with improved characteristics. Membrane pore size, porosity, and thickness increased significantly from 0.17 µm to 0.21 µm, 48.37% to 67.79%, and 79.31 µm to 107.62 µm, respectively, within the studied range. A pure PVDF membrane CA of 88° was increased to 117.3° for 2 wt% loaded PTFE in PVDF. The synthesis of PVDF–PTFE hybrid membranes that used DMSO as a solvent and distilled water as a nonsolvent in a coagulation bath appears to be viable for membrane preparation via phase inversion to provide a reliable and sustainable separation process with a safer environment. The performance of the synthesized membrane was studied for flux and the separation factor. The maximum ethanol flux and separation factor obtained were 11 kg/m2/h and 7.0, respectively. This work suggests that the PVDF–PTFE hybrid flat sheet membranes could be used for ethanol separation in VMD.

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Acknowledgments

The research group gratefully acknowledge the material research center, MNIT Jaipur, Dr. U. K. Arun Kumar (MNIT Jaipur) for support during the experimental work.

Notation

The following symbols are used in this paper:
A
effective area of used membrane (m2);
J
permeate flux (kg/m2h);
mp
mass of dry membrane (g);
mb
mass of wet membrane (g);
W
weight of permeate (kg);
xE
mole fraction of ethanol in feed side;
yE
mole fraction of ethanol in permeate side;
Δt
time of separation (h);
ɛ
porosity of the membrane (%);
ρp
density of membrane (g/cm);
γSL
interacting force for solid and liquid phase;
γSV
interacting force for solid and vapor phase;
γLV
interacting force for liquid and vapor phase;
ρb
density of isopropanol (g/cm3); and
θ
contact angle (°).

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Go to Journal of Hazardous, Toxic, and Radioactive Waste
Journal of Hazardous, Toxic, and Radioactive Waste
Volume 26Issue 4October 2022

History

Received: Aug 23, 2021
Accepted: Mar 17, 2022
Published online: May 27, 2022
Published in print: Oct 1, 2022
Discussion open until: Oct 27, 2022

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Dept. of Chemical Engineering, MNIT, Jaipur 302017, Rajasthan, India. ORCID: https://orcid.org/0000-0001-6480-9042
Priya Pal
Dept. of Chemical Engineering, MNIT, Jaipur 302017, Rajasthan, India.
Md. Oayes Midda
Dept. of Chemical Engineering, MNIT, Jaipur 302017, Rajasthan, India.
S. P. Chaurasia [email protected]
Dept. of Chemical Engineering, MNIT, Jaipur 302017, Rajasthan, India (corresponding author). Emails: [email protected];[email protected]

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