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4824781 
Journal Article 
Uranium Sorption by Glutamate Glucan: A Modified Chitosan. Part I: Equilibrium Studies 
Saucedo, I; Guibal, E; Roussy, J; Roulph, C; Le Cloirec, P 
1993 
Chitosan, a natural polymer, was modified by an oxo-2-glutaric acid substitution and a subsequent reduction to form glutamate glucan. This modified chitosan was then used to examine the sorption of uranium from dilute aqueous waste streams. The main parameters that play an important part in sorption mechanisms are the pH and the total metal concentration. Other parameters such as temperature, agitation and particle size of the sorbent show a restricted effect on the sorption equilibrium. The maximum uptake capacity, obtained at pH 5-6, reaches approximately 500 mg U/g. At pH 5, a sorption monolayer is predominant; at higher pH, the sorption becomes more complicated. Surface precipitation adsorption is the probable cause for the adsorption multilayer mechanism. (See also W93-07097) (Author's abstract) 
*Chitosan; *Industrial wastewater; *Sorption; *Uranium; *Wastewater treatment; Hydrogen ion concentration; Particle size; Temperature