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

Abstract

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 k_{288 K}=2.22×10⁻⁵ s^t-1, k_{298 K}=2.51×10⁻⁵ s⁻¹, and k_{308 K}= 2.95×10⁻⁵ s⁻¹, respectively. The apparent activation energy, E_a is 10.5 kJ/mol, and the adsorption parameters of thermodynamics are ΔH^Θ=13.3 kJ/mol, ΔS^Θ=119 J/(mol·K), and ΔG^Θ 298 K =−22.2 kJ/mol, respectively. The adsorption behavior of D152 resin for Pb²⁺ follows Langmuir model.

Keywords

Pb²⁺ / macroporous weak acid resin / adsorption / thermodynamics

References

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