Preparation of thermal active nano-materials for application in water desalination and wastewater treatment, Dielectric Study

Document Type : Original Article


1 Water Pollution Control Dep., National Research Center, Dokki, Cairo, Egypt

2 National Research Centre

3 Microwave Physics and Dielectrics Dep., Physics Institute of Research, National Research Centre, Dokki, Giza, Egypt

4 1National Research Centre, Solid State Physics Department, Physics Research Division,33 El Behooth St., Dokki, Giza, Egypt, (Affiliation ID: 60014618).


Recently, Egypt has suffered a sharp shortage of water for different uses. This fact could be aggravated in the very near future. Therefore, the need to valorize the non-conventional water resources is of vital importance. The current study aims to prepare a floating membrane using polyvinyl alcohol (PVA), carboxymethyl cellulose (CMC) polymer, and copper oxide (CuO) for water desalination. The possibility of using the resulting membrane for distillation of the water with brine made using sodium chloride salt was tested. The prepared floating membrane was found to be effective in desalinating water. In addition, CMC/PVA- based composites have been electrically investigated to determine the low delay characteristics of high-frequency signal transmission. The permittivity and loss tangent of these composites were examined over a wide frequency range (10-1-106 Hz) at room temperature, using a broadband dielectric spectrometer (BDS). Experimental results reported low permittivity (~4 to 5) and loss tangent (~1×10-3 to 1.5×10-3) values. These features would make the composites promising in the high-frequency applications and desalination of saline water.


Main Subjects

Volume 65, Issue 13 - Serial Number 13
Special Issue: Chemistry and Global Challenges
December 2022
  • Receive Date: 10 April 2022
  • Revise Date: 09 May 2022
  • Accept Date: 16 May 2022
  • First Publish Date: 16 May 2022