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Membrane Water Treatment Volume 6, Number 1, January 2015 , pages 27-42 DOI: https://doi.org/10.12989/mwt.2015.6.1.027 |
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Preparation of bi-polar membranes and their application to hypochlorite production |
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Jung Sik Kim, Eun Hye Cho, Ji Won Rhim, Chan Jong Park and Soo-Gil Park
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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 F2 gas against N2 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. | ||
| Key Words | ||
| aminated polysulfone; bi-polar membrane; hypochlorite; sulfonated poly (phenylene oxide); surface fluorination | ||
| Address | ||
| (1) Jung Sik Kim, Soo-Gil Park: Department of Industrial Engineering Chemistry, Chungbuk National University, 52 Naesudong-ro, Heungdeok-gu, Cheongju, Chungbuk 361-763 Korea; (2) Eun Hye Cho, Ji Won Rhim, Chan Jong Park: Department of Chemical Engineering, Hannam University, 1646 Yuseongdae-ro, Yuseong-gu, Daejeon 305-811 Korea. | ||
