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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 s-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 -HΘ=13.3 kJ/mol, -SΘ=119 J/(mol·K), and -GΘ298 K =-22.2 kJ/mol, respectively. The adsorption behavior of D152 resin for Pb2+ follows Langmuir model.
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 s-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 -HΘ = 13.3 kJ / mol, -SΘ = 119 J / (mol · K), and -G Θ298 K = -22.2 kJ / mol, respectively. The adsorption behavior of D152 resin for Pb2 + follows Langmuir model.