Improve the removal of Th(IV) ion by using the inorganic complexing agent in the structure of Amberlite resin

An Amberlite XAD-4 resin loaded with a tetradentate Schiff base bis(2-hydroxybenzaldehyde)-1,2-ethylendiimine (HL) was used for the removal of thorium ions from aqueous solution.(HL). Under optimal conditions (pH=5, adsorbent dosage 0.1 g, contact time 45 min. and at temperature of 25oC) for thorium ions (20 mg/L) were quantitatively removed from 20 ml of the sample solution. A shift for uptake of the metal ions vs. pH curves towards lower pH the values by applying the loaded resin with Schiff base compared with unloaded ones (about ΔpH0.5=1.9). The kinetic data corresponds well to the pseudo-second-order equation. This model predicts chemisorption for the adsorption. Thermodynamic investigation reveals that the adsorption process of the studied ions is entropy driven.

کلیدواژه ها:

Amberlite XAD-4 ، Th(IV) ، Schiff base ، Adsorption