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http://dx.doi.org/10.14579/MEMBRANE_JOURNAL.2015.25.5.447

Hypochlorite Production by Using SPEEK/APSf and SPEEK/APEI Bipolar Membranes Modified by the Direct Fluorination  

Kim, Ka young (Department of Advanced Materials and Chemical Engineering, Hannam University)
Cheong, Seong Ihl (Department of Advanced Materials and Chemical Engineering, Hannam University)
Rhim, Ji Won (Department of Advanced Materials and Chemical Engineering, Hannam University)
Publication Information
Membrane Journal / v.25, no.5, 2015 , pp. 447-455 More about this Journal
Abstract
In this study, Polysulfone (PSf) and polyetherimide (PEI) as the anion exchange polymers were aminated in the different ratio whereas the polyether ether ketone (PEEK) as the cation exchange polymer was sulfonated. The bipolar membranes of SPEEK (sulfonated PEEK)/APSf (aminated PSf) and SPEEK/APEI (aminated PEI) were prepared by the double-casting method. The surfaces of bipolar membranes were fluorinated in accordance with the amination ratio and applied to produce the hypochlorite. As the amination increased, the hypochlorite concentration is also increased. Typically, for SPEEK/APSf 3 : 1 membrane, the produced hypochlorite concentration was 61.0 ppm and its durability was 220 min for the non-fluorinated membrane while for the fluorinated membrane, the concentration of 58.6 ppm and its durability lasted 570 min. Also for SPEEK/APEI 3 : 1 membrane, the hypochlorite concentrations of 60.1 ppm and 58.3 ppm for before- and after-fluorination, respectively were observed whereas the durability was remarkably developed from 150 min to 440 min. Therefore, the surface fluorination takes an important role for the development of the membrane durability.
Keywords
hypochlorite production; bi-polar membrane; aminated polysulfone; surface fluorination; sulfonated poly ether ether ketone;
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