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KMID : 1059519980420060672
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Journal of the Korean Chemical Society
1998 Volume.42 No. 6 p.672 ~ p.678
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Effect of Molecular Weight of Chitosan on Flocculation of Suspended Solids in Rhodamine 6G-Sodium Dodecyl Sulfate System
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Kim Sung-Hyun
Nah Jae-Woon
Oh Jeong-Sun
Song Ki-Dong
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Abstract
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Chitin was extracted from crab shell of Portuns triberculatus and deacethylated to yield chitosan with various molecular weights. 'ne absorption and the fluorescence spectra of Rhodamine 6G(Rh 6G)-sodium dodecyl sulfate(SDS) and Rh 6G-chitosan systems were obtained. From the spectra, we observed that the absorption and the fluorescence intensity of Rh 6G-SDS system decreased when S/D(the concentration of SDS to that of Rh 6G ratio) was below or at 32, while they increased when S/D was above 32. From the suspended solid(SS) removal rate and the transmittance of Rh 6G-SDS-chitosan system, we found that when S/D ratio was 32 its flocculating behaviour was much stronger than Rh 6G-SDS system. As the concentration and the molecular weight of chitosan increased, we also found that S/D range was extended from 32 to 100. With increasing the molecular weight of chitosan, the SS removal rate increased around pH 2-9 but decreased remarkably at pH > 12.
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