Preparation of a new Cu(II)-imprinted pyridine-functionalized silica gel sorbent and its adsorption characteristic

Abstract

A new sorbent of Cu(II)-imprinted pyridine-functionalized silica gel (Cu-IIP/SiO2) was prepared with molecular surface-imprinting technique for selective solid-phase extraction (SPE) of Cu(II). The Cu-IIP/SiO2 had better adsorption capacity and selectivity for Cu(II) then non-imprinnted polymer. The maximum static adsorption capacity for Cu(II) was 20.67 mg g-1 and 13.36 mg g-1 for the ion-imprinted and non-imprinted sorbents, respectively. The time of adsorption equilibrium was 10 min, and the quantitative desorption only needed 3 min with 0.1 mol L-1 HCl as the eluant. The adsorption kinetic and isotherm of the Cu-IIP/SiO2 were agreed with pseudo-second-order kinetic model and Langmuir adsorption model, respectively. The Cu-IIP/SiO2 was recycled ten times and the absorption capacity was no significant decrease.