Membrane and Water Treatment

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Preparation of bi-polar membranes and their application to hypochlorite production

  • Kim, Jung Sik (Department of Industrial Engineering Chemistry, Chungbuk National University) ;
  • Cho, Eun Hye (Department of Chemical Engineering, Hannam University) ;
  • Rhim, Ji Won (Department of Chemical Engineering, Hannam University) ;
  • Park, Chan Jong (Department of Chemical Engineering, Hannam University) ;
  • Park, Soo-Gil (Department of Industrial Engineering Chemistry, Chungbuk National University)
  • Received : 2014.06.04
  • Accepted : 2014.12.05
  • Published : 2015.01.25
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Abstract

In this study, poly (phenylene oxide) (PPO) and poysulfone (PSf) were sulfonated and aminated respectively. Both sulfonated poly (phenylene oxide) (SPPO) and aminated polysulfone (APSf) were characterized via the measurement of FT-IR, swelling degree, ion exchange capacity (IEC), and ion conductivity. Then the surfaces of these membranes were modified by surface fluorination using 2000 ppm $F_2$ gas against $N_2$ gas for 1 h at room temperature. The surface fluorinated SPPO and APSf membranes were characterized again to determine any differences between the pristine and fluorinated membranes. In total, 3 types of bi-polar membranes were prepared by varying the IEC of the APSf and having a fixed value for the IEC of the SPPO. The hypochlorite concentration generated by using the surface fluorinated membranes was dependent on the IEC of the APSf and ranged from 683 to 826 ppm, while there was a considerable improvement in the durability of the surface fluorinated membranes as they remained intact even after operating for 4 h.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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