Membrane and Water Treatment

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Morphological study of synthesized PVDF membrane using different non-solvents for coagulation

  • Yadav, Meenakshi (Department of Chemical Engineering, Malaviya National Institute of Technology) ;
  • Upadhyay, Sushant (Department of Chemical Engineering, Malaviya National Institute of Technology) ;
  • Singh, Kailash (Department of Chemical Engineering, Malaviya National Institute of Technology) ;
  • Chaturvedi, Tarun Kumar (Department of Chemical Engineering, Malaviya National Institute of Technology) ;
  • Vashishtha, Manish (Department of Chemical Engineering, Malaviya National Institute of Technology)
  • Received : 2022.02.04
  • Accepted : 2022.05.31
  • Published : 2022.07.25
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Abstract

Polyvinylidene fluoride (PVDF) flat sheet hydrophobic membranes were prepared using 16 wt% PVDF in Dimethyl acetamide (DMAc) by phase inversion technique for desalination application using Membrane Distillation (MD). In this work, the effect of coagulation mediums such as ethanol and water as well their synergistic behavior on the fabricated PVDF membrane morphology was studied using SEM. Moreover, other characteristics required for the membrane distillation applications namely porosity, hydrophobicity and tensile strength were measured using the gravimetric method, sessile drop method and universal testing machine respectively. It was observed that the membrane morphology paradigm shifted from the finger-like structure to the sponge-like structure on increasing the ethanol concentration in coagulant. The porosity of the fabricated membrane was under the required MD range and found to be 57.3% at 16 weight % of PVDF in DMAc solvent under a pure ethanol coagulant bath. Moreover, the top surface contact angle ranges from 85° to 115° on increasing the bath concentration from CBC 0 to CBC 100 at 16 weight % of PVDF in DMAc solvent.

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References

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