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In the study, a sorbent based on alginate-modified polyurethane (APU) was prepared using alginate and 2,4-toluene diisocyanate (2, 4 T야) and used for removal of for ammonium ion from water. Physical characterization of APU was conducted according to the ...

In the study, a sorbent based on alginate-modified polyurethane (APU) was prepared using alginate and 2,4-toluene diisocyanate (2, 4 T야) and used for removal of for ammonium ion from water. Physical characterization of APU was conducted according to the BET method. Surface analysis using electron scanning electron microscope (SEM) / dispersive spectrometer (EDS). The structure of APU was confirmed by Fourier transform infrared (FT-IR) spectroscopy and proton nuclear magnetic resonance (1H-NMR) spectroscopy. Adsorption isotherm experiments and kinetic sorption experiments were performed. The result summarized from this study are as follows. Result of adsorption isotherms were more adequately described by the Freundlich model than Langmuir model. Result of kinetic adsorption experiments were more properly fitted by pseudo-second order model than pseudo-first order model. The optiumem pH for ammonium ion adsorption of APU was found to be within the pH range (pH 3-7). Three different temperature level of 15, 25 and 35℃ were set in this experiment. Adsorption capacity of ammonia ion on APU enhanced with temperature increase. FT-IR and 1H-NMR and analysis confirmed that a chemical bonding between phenyl group of alginte and carboxy group of polyurethane had been established. The carboxy group of alginate on APU was intact and available for specific interaction with positively charged ammonium ion. Adsorption capacity of the APU for ammonium ion was enhanced due to alcoholic and carboxylic functional groups of alginate. Therefore, APU can effectively be applied for removal of ammonium ion.

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