화학공학소재연구정보센터
Polymer(Korea), Vol.20, No.5, 902-909, September, 1996
MB-SDS계내에서 키토산의 응집거동에 관한 연구
Flocculating Behavior of Chitosan in MB-SDS System
초록
Wolfrom법에 의해 게껍질로부터 얻은 키틴을 탈아세틸화시켜 키토산을 제조하였다. Methylene blue (MB)-키토산계 및 MB-sodium dodecyl sulfate (SDS)계의 상호작용에 있어서 키토산의 첨가효과를 분광학적으로 고찰하였고, 이들 계에 있어서 pH 및 부유물질 (SS)의 제거율 등 응집효과에 대해 검토해 보았다. MB-키토산계내에서 키토산의 농도가 증가함에 따라 단위체의 흡광도의 증가로 회합이 일어나지 않음을 알 수 있었다. 그러나 SDS≤1 mM에서는 키토산을 첨가한 MB-키토산-SDS계의 흡광도가 MB-SDS계보다 더 감소하므로써 다분자 회합체의 회합이 더욱 촉진됨을 알 수 있었다. 그리고 MB-키토산-SDS계와 MB-SDS계 사이의 흡광도차를 보면, isopropyl alcohol과 ethyl alcohol은 약 30% 그리고 ethylene glycohol은 약 40%에서 흡광도차가 가장 크게 증가하였다. 한편, 응집효과에서 키토산의 농도를 2배로 증가하면, SS 제거율은 약 2배로 증가하였다. 그리고 pH 6∼9에서 SS 제거율이 가장 좋은 응집효과를 가지는 반면, pH 12 이상에서는 가장 낮은 응집효과를 가졌다. 또한, MB-키토산-SDS계에 첨가한 유기용매는 흡광도차가 가장 큰 농도에서 SS 제거율이 현저히 감소됨을 알 수 있었다.
Chitin was obtained from crab shell by Wolfrom's method and chitosan was deacethylated from chitin. The interaction of MB-chitosan and MB-chitosan-SDS system was examined by means of spectrophotometer. The flocculation effect of pH and removal rate of suspended solid (SS) was studied. With increasing the concentration of chitosan in MB-chitosan system, the disassociation occurred by means of increasing absorbance of monomer. When [SDS] ≤ 1 mM, the absorbance of MB-chitosan-SDS system decreased more than that of MB-SDS system. It promoted greatly the aggregation of polymer. The differential absorbance between MB-chitosan-SDS and MB-SDS system increased greatly at 30% isopropyl alcohol, 30% ethyl alcohol and 40% ethylene glycohol. When the concentration of chitosan increases twice, the removal rate of SS was doubled. The removal rate of SS had the high flocculation at pH 6∼9, but at above than pH 12 it had the low flocculation. It was reduced in HB-chliosan-SDS system with organic solvent.
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