Membrane and Water Treatment

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PVDF/h-BN hybrid membranes and their application in desalination through AGMD

  • Moradi, Rasoul (Department of Chemical Engineering, School of Engineering and Applied Science, Khazar University) ;
  • Shariaty-Niassar, Mojtaba (Transport Phenomena & Nanotechnology Laboratory, School of Chemical Engineering, College of Engineering, University of Tehran) ;
  • Pourkhalili, Nazila (Department of Chemical Engineering, School of Engineering and Applied Science, Khazar University) ;
  • Mehrizadeh, Masoud (Department of Chemical Engineering, School of Engineering and Applied Science, Khazar University) ;
  • Niknafs, Hassan (Department of Chemical Engineering, School of Engineering and Applied Science, Khazar University)
  • Received : 2016.11.22
  • Accepted : 2017.12.20
  • Published : 2018.07.25
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Abstract

A new procedure to produce poly(vinylidene fluoride)/boron nitride hybrid membrane is presented for application in membrane distillation (MD) process. The influence of hexagonal boron nitride (h-BN) incorporation on the performance of the polymeric membranes is studied through the present investigation. For this aim, h-BN nanopowders were successfully synthesized using the simple chemical vapor deposition (CVD) route and subsequent solvent treatments. The resulting h-BN nanosheets were blended with poly(vinylidene fluoride) (PVDF) solution. Then, the prepared composite solution was subjected to phase inversion process to obtain PVDF/h-BN hybrid membranes. Various examinations such as scanning electron microscopy (SEM), wettability, permeation flux, mechanical strength and liquid entry pressure (LEP) measurements are performed to evaluate the prepared membrane. Moreover, Air gap membrane distillation (AGMD) experiments were carried out to investigate the salt rejection performance and the durability of membranes. The results show that our hybrid PVDF/h-BN membrane presents higher water permeation flux (${\sim}18kg/m^2h$) compared to pristine PVDF membrane. In addition, the experimental data confirms that the prepared nanocomposite membrane is hydrophobic (water contact angle: ${\sim}103^{\circ}$), has a porous skin layer (>85%), as well competitive fouling resistance and operational durability. Furthermore, the total salt rejection efficiency was obtained for PVDF/h-BN membrane. The results prove that the novel PVDF/h-BN membrane can be easily synthesized and applied in MD process for salt rejection purposes.

Keywords

References

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