Coagulation mechanism of salt solution-extracted active component in Moringa oleifera seeds.
This study focuses on the coagulation mechanism by the purified coagulant solution (MOC-SC-PC) with the coagulation active component extracted from M. oleifera seeds using salt solution. The addition of MOC-SC-PC tap water formed insoluble matters. This formation was responsible for kaolin coagulation. On the other hand, insoluble matters were not formed when the MOC-SC-PC was added into distilled water. The formation was affected by Ca2+ or other bivalent cations which may connect each molecule of the active coagulation component in MOC-SC-PC and form a net-like structure. The coagulation mechanism of MOC-SC-PC seemed to be an enmeshment of Kaolin by the insoluble matters with the net-like structure. In case of Ca2+ ion (bivalent cations), at least 0.2 mM was necessary for coagulation at 0.3 mgC l-1 dose of MOC-SC-PC. Other coagulation mechanisms like compression of double layer, interparticle bridging or charge neutralization were not responsible for the coagulation by MOC-SC-PC.
Department of Environmental Science, Faculty of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan. tetsuji@environ.hiroshima-u.ac.jp
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Okuda
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Baes
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Nishijima
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Okada
D002413:Cations, Divalent / Q000494:pharmacology; D008956:Models, Chemical; D010679:Philippines; D019685:Rosales / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry; D012965:Sodium Chloride; D012995:Solubility
D002413:Cations, Divalent; D012965:Sodium Chloride