Adsorption of Pb(II) in Aqueous Solution on SQD-85 Resin

Abstract

The adsorption and desorption behaviours of Pb(II) on SQD-85 resin were investigated using batch and column methods. Batch adsorption studies were carried out with different pH, contact time and temperature. In the batch system, the SQD-85 resin exhibited the highest Pb(II) uptake as 476 mg/g at 298 K, at an initial pH value of 6.00. The process was very fast initially and equilibrium time was observed within 50 h. And the adsorption data gave better fits with Langmuir isotherms. The thermodynamic parameters such as DG, which were all negative, indicated that the adsorption of Pb(II) ions onto SQD-85 resin was spontaneous and the positive value of DH showed that the adsorption was endothermic in nature. Pb(II) adsorbed on SQD-85 resin can be completely eluted by 0.1 mol/L HCl. Thomas model was applied to experimental column data to determine the characteristic parameters of column useful for process design. Finally, the SQD-85 resin can be regenerated and reused. The sorption of Pb(II) on SQD-85 resin from simulated seawater is also studied.