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Surface modification of monolithic PolyHIPE Polymers for anionic functionality and their ion exchange behavior

Lookup NU author(s): Dr Bulent Keskinler, Professor Galip Akay

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Abstract

Monolithic PolyHIPE Polymer (PHP), being a highly porous, low density, open cellular material was produced by polymerization of a high internal phase emulsion (HIPE) in which the polymerizable continuous phase consisted of monomers, styrene (STY), and divinyl benzene (DVB). The inner dispersed phase (90 vol %) was an aqueous solution containing 0.4 wt % potassium persulphate as initiator. The resulting porous structure had 12% crosslinking density. Surface chemistry of the monoliths was modified by chloromethylation and amination to impart anionic functionality. Surface modified monoliths had ion exchange capacity of 3.01 meq/g, and had the ability to uptake water about 10 times of its mass. It was used Cr (VI) ion removal from aqueous solution. The experimental results investigated for both the Langmuir and the Dubinin-Radushkevich adsorption models. The maximum Cr (VI) adsorptions are 126.6 mg Cr (VI)/g and 129.3 mg Cr (VI)/g, respectively. The mean free energy E of adsorption is 11.18 kJ/mol according to the Dubinin-Radushkevich adsorption model, indicating that the adsorption occurs through a chemical ion-exchange process and it is not diffusion limited. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42286.


Publication metadata

Author(s): Barlik N, Keskinler B, Kocakerim MM, Akay G

Publication type: Article

Publication status: Published

Journal: Journal of Applied Polymer Science

Year: 2015

Volume: 132

Issue: 29

Print publication date: 05/08/2015

Online publication date: 18/04/2015

Acceptance date: 31/03/2015

ISSN (print): 0021-8995

ISSN (electronic): 1097-4628

Publisher: Wiley-Blackwell

URL: http://dx.doi.org/10.1002/app.42286

DOI: 10.1002/app.42286


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