Synthesis, adsorption kinetics and thermodynamics of ureido-functionalized Pb(ii) surface imprinted polymers for selective removal of Pb(ii) in wastewater

Abstract

A novel ureido-functionalized Pb(II)-imprinted polymer (Pb(II)-IIP) was synthesized using Pb(II) ion, γ-ureidopropyltrimethoxysilane, AIBN and EGDMA as template ion, functional monomer, initiator and cross-linking agent, respectively. Pb(II)-IIP was characterized by FTIR and SEM. The effect of initial concentration of Pb(II) ions, adsorption time, temperature and pH values on the adsorption capacity of Pb(II)-IIP were studied. The equilibrium adsorption capacity of Pb(II)-IIP could reach 97.5 mg g⁻¹. Langmuir models were adopted and R² was 0.9908. The adsorption process is endothermic and could occur spontaneously. The relative selectivity coefficients of Pb(II)-IIP were 3.55, 7.02, 3.77 for Pb²⁺/Cd²⁺, Pb²⁺/Cu²⁺, Pb²⁺/Zn²⁺ respectively.