Removal and Recovery of Mo(IV) from Aqueous Solutions by D201 Resin: Adsorption and Column Studies

The adsorption and desorption properties of D201 resin for Mo(IV) have been investigated in CH3COOH-CH3COOAc medium. A series of experiments were-conducted in a batch system to assess the effect of the system variables, i.e., initial pH, contact time and temperature. The optimal pH for the adsorption was 5.5 and the maximum adsorption capacity Was 501.4 mg/g at 298 K. The apparent adsorption rate constant were k(288-K) = 2.69 x 10(-5) S-1; k(308 K) = 4.37 x 10(-5) s(-1); k(313 K) = 4.61 x 10(-5) S-1, respectively. The adsorption isotherms data fitted well to Langmuir Model. Finally, Mo(IV) could be eluted by using 1.25 mol/LNaOH solution and the resin can be regenerated and reused without apparent decrease of adsorption capacity.