Application on Biopolymers on Mercury Waste Treatment:....

Adsorption of Chitosan Hydrogel Granule with Heavy MetalsSpeaker:
Prof. Chang-Chin Kwan
Providence University, TaiwanAbstract:
Heavy metal pollution in aquatic systems is a pervasive and extremely serious problem. The high cost for cleanup tends to increase. A selective, high-capacity adsorbent process is developed to recover the heavy metals, thus minimizing fouling. Biopolymers such as chitosan and sodium polyglucosamine can be used separately or together for the adsorption studies. A practical example is that at pH 5, the maximum capacity for mercury is 0.4% to 7mg of sodium polyglucosamine per gram of beach sand. Furthermore, a capsule delivering system using chitosan and tripolyphosphate was made. The microcapsules were prepared by emulsification/internal gelification method. The release behavior of Vitamin E from these microcapsules was investigated in phosphate buffered saline (PBS) and hydrophobic medium. Results indicated that the release of Vitamin E is slow but with higher concentrations of chitosan and TPP solutions, a convenient method to encapsulate active ingredients in microcapsules for 10 hours in aqueous PBS solution or 7 hours in the lipo-system can be developed.

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