Synthesis and Evaluation of Peptide-Manganese Dioxide Nanocomposites as Adsorbents for the Removal of Strontium Ions.

In this study, a novel organic-inorganic hybrid material IIGK@MnO 2 (2-naphthalenemethyl-isoleucine-isoleucine-glycine-lysine@manganese dioxide) was designed as a novel adsorbent for the removal of strontium ions (Sr 2+ ). The morphology and structure of IIGK@MnO 2 were characterized using TEM, AFM, XRD, and XPS. The results indicate that the large specific surface area and abundant negative surface charges of IIGK@MnO 2 make its surface rich in active adsorption sites for Sr 2+ adsorption. As expected, IIGK@MnO 2 exhibited excellent adsorbing performance for Sr 2+ . According to the adsorption results, the interaction between Sr 2+ and IIGK@MnO 2 can be fitted with the Langmuir isotherm and pseudo-second-order equation. Moreover, leaching and desorption experiments were conducted to assess the recycling capacity, demonstrating significant reusability of IIGK@MnO 2 .