Adsorption of Pb2+ on macroporous weak acid adsorbent resin from aqueous solutions: Batch and column studies

The adsorption properties of a novel macroporous weak acid resin (D152) for Pb2+ were investigated with chemical methods. The optimal adsorption condition of D152 resin for Pb2+ is at pH 6.00 in HAc-NaAc medium. The statically saturated adsorption capacity is 527 mg/g at 298 K. Pb2+ adsorbed on D152 resin can be eluted with 0.05 mol/L HCl quantitatively. The adsorption rate constants determined under various temperatures are k288 K=2.22×10−5 st-1, k298 K=2.51×10−5 s−1, and k308 K= 2.95×10−5 s−1, respectively. The apparent activation energy, Ea is 10.5 kJ/mol, and the adsorption parameters of thermodynamics are ΔHΘ=13.3 kJ/mol, ΔSΘ=119 J/(mol·K), and ΔGΘ 298 K =−22.2 kJ/mol, respectively. The adsorption behavior of D152 resin for Pb2+ follows Langmuir model.