Chemija / Chemistry
 ISSN 0235-7216 ISSN 2424-4538 (online) |
2013 m. Nr. 2 Heavy metal sorption onto chitosan and chitosan-citrate derivatives
Practical application of chitosan as a sorbent is limited due to its low sorption rates and insufficient mechanical stability to use in filtering systems. In order to improve the sorption properties the chemical modification with citrate has been performed. The sorption rates and capacities were evaluated by determination of the sorbed heavy metal ion amounts. The heavy metal uptake by chitosan increases with decrease in particle size and introduction of citrate. Citrate also enhances sorption capacity. The quantities of citrate introduced into chitosan determine its sorption behavior. The sorption onto chitosan or chitosan containing small amounts of citrate proceeds according to the pseudo-second order kinetic equation and fits the Freundlich equation under equilibrium conditions. The sorption onto chitosan containing high amounts of citrate (>0.1 mol g–1) is more complicated. The chitosan-citrate derivative was characterized using potentiometric titrations, Raman and FT-IR investigations.
Keywords: chitosan, citrate, modification, FT-IR investigations, Raman spectroscopy |
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