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Received July 18, 2008
Accepted October 23, 2008
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An evaluation on PAH degradation and characteristics as media of PVA-derivative hydrogels prepared by using a CGA technique
Department of Marine Environmnetal Engineering/Institute of Marine Industry, Gyeongsang National University, Tongyeong 650-160, Korea 1Department of Energy & Environmental Engineering, Soonchunhyang University, Asan 336-745, Korea
daechul@sch.ac.kr
Korean Journal of Chemical Engineering, March 2009, 26(2), 403-410(8), 10.1007/s11814-009-0068-z
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Abstract
We manufactured PVA-derived hydrogels wth some crosslinkers by using a foam generation technique. Amino acids gels showed remarkably higher swelling ratios, probably because of the highly crosslinked network along with hydrogen bonds. Boric acid and starch would catalyze dehydration while structuring to result in much lower water content and accordingly high gel content, leading to less elastic, hard gels. Bulky materials such as ascorbic acid or starch produced, in general, large pores, and also nicotinamide, highly hydrophobic, was likely to enlarge its pore size, thus leading to reduced swelling. Hydrophilic (or hydrophobic), functional groups which are involved in the reaction or physical linkage, and bulkiness of crosslinkers were found to be more critical to the crosslinking structure and its density than molecular weights that seemed to be closely related to pore sizes. The average sizes of pores were 20 μm for methionine, 10-15 μm for citric acid, 50-70 μm for L-ascorbic acid, 30-40 μm for nicotinamide, and 70-80 μm for starch. Also, amino acid and glucose gels were more elastic than the others. The elasticity of a gel was reasonably correlated with its water content or swelling ratio. On the other hand, L-ascorbic acid among glucose, methionine, citric acid and vitamins, imparted not only the most favorable physical properties and the greatest cell density but also the highest PAH degradation on its derivative gels. The higher biomass ensured the higher degradation rate. The maximum cell density was 0.267 mg/g-hydrogel and degradation rates and efficiencies ranged 0.013-0.007 mM/mg/day and 92-48%, respectively.
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References
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Baker JP, Siegel RA, Macromol. Rapid Commun., 17(6), 409 (1996)
Wu JZ, Sassi AP, Blanch HW, Prausnitz JM, Polymer, 37(21), 4803 (1996)
Park TG, HoffamanAS, J. Appl. Polym. Sci., 46, 659 (1992)
Donaldson E, Cuy J, Nair P, Ratner B, J. Macromol. Symp., 227, 115 (2005)
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Morehead NR, Eadie BJ, Lake B, Landrum PD, Berner D, Chemosphere, 15, 403 (1986)
