Preparation and Adsorption Properties of Lanthanide Ion Surface-Imprinted Polymer Based on Reaming MCM-41

In this paper, APTES was used as the functional monomer, reamed MCM-41 was used as the carrier, and epichlorohydrin was used as the crosslinking agent to prepare the Lanthanide ion-imprinted polymer, La-IIP. The effects of pH, time, temperature, and initial concentration on La-IIP adsorption were investigated, and the adsorption mechanism was discussed by fitting the adsorption data to various kinetic and thermodynamic models. The results showed that La-IIP reached adsorption equilibrium in 20 min at 338 K and pH = 5, and the maximum adsorption capacity was 272.2 mg/g. The La-IIP adsorption process conformed to the Langmuir adsorption model, and La-IIP showed strong selectivity for La(III) in the presence of interfering ions with similarproperties. 2 M hydrochloric acid solution was used to eluate La-IIP and re-adsorb lanthanum ion solution. After elution of La-IIP for five times, the adsorption remained at the initial value of 81%. It shows that La-IIP has stability and reusability.