Investigation of the strontium (Sr(II)) adsorption of 18-crown-6 based polymer

The development of efficient and reusable Sr2+ adsorbent materials holds great significance for nuclear energy development and environmental protection. In order to address the low crown ether content in crown ether-based solid-phase adsorbents, this study employed condensation polymerization using di(aminobenzo)-18-crown-6 as monomers to prepare polymer materials and porous membranes. The adsorption kinetics, adsorption isotherm, and recyclability of the crown ether-based polymer were comprehensively investigated for Sr2+ adsorption. The results showed that the adsorption behavior of the polymer towards Sr2+ followed a pseudo-first-order kinetic model and Langmuir adsorption model, with a maximum adsorption capacity of 4.6 mg/g. Furthermore, even after five cycles, the adsorption performance of the polymer material for Sr2+ showed no significant decline. This study provides a new perspective for the development of long-lasting and highly efficient Sr2+ adsorbent materials.