الفهرس 
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Abstract
In this work, we use orange stem powder (OrB) as biosorbent for the extraction of iron (III) from aqueous solutions. The overall results indicated that the orange stem powder is an effective and low cost biosorbent for the extraction process, in which the kinetic, thermodynamic and isotherm properties of extraction process was studied. But the leaching of cellulose or lignin from the wood matrix in acidic and alkaline medium is a problem which necessitates the treated of a biosorbent to prevent the loss of its active components through leaching. So we use lignin (LigOB) extracted from orange biosorbent (OrB) for preparation new chelating (Lig-NO2B, Lig-NH2B, and Lig-N=N-OxB) as stable biosorbents to overcome the leaching of orange biosorbent components. These biosorbents were used for sorption of Fe(III) and conclude that Lig-N=N-OxB has the ability to separate iron from pharmaceutical vitamin drugs.
Lignin alkyd resin (LA-Resin) was prepared via polycondensation reaction between lignin, palmatic acid and glycerol, then used as new stable biosorbent for the sorption Mo(V) and conclude that LA-Resin has the ability to separate Mo(V) pharmaceutical vitamin drugs and biological samples. The effect of different factors including pH, contact shaking time, initial concentration, solution temperature and the dynamic expriments have been investigated. Kinetic and equilibrium studies showed that pseudo-second order and Langmuir adsorption isotherm model fitted very well for the experimental results. Besides, the sorption process was spontaneous, endothermic in nature.