In this study, MnO2/zeolite composites (MnO2@Z4As) were synthesized via a one-pot self-assembly reaction using low-cost kaolinite minerals as the starting material. The successful embedding of MnO2 nanoparticles within the zeolite matrix was confirmed through structural characterization. The highest capacity for Sr2+ adsorption was observed for MnO2@Z4A-9 at 177.49 mg/g, representing a 39.96% increase compared to zeolite 4A (Z4A) alone. The process displayed characteristics consistent with the Langmuir model and pseudo-second-order kinetic behavior, indicating that the adsorption was monolayer chemisorption. However, competing ions, such as Ca2+ and Na+, significantly hindered Sr2+ adsorption. In seawater, MnO2@Z4A-9 removed 98.4% of Sr2+ at a 10 g/L dosage. The dual adsorption mechanism of Sr2+ adsorption on MnO2@Z4As has been elucidated, comprising ion exchange with Na+ in the zeolite and the hydroxyl complexation with MnO2. This study offers a cost-effective strategy for Sr2+ removal from seawater.
Cite this Article (APA)
Zi, C., Haihua, L., Xiaowu, P., Qian, Y., Ling, W., Lingyi, W., Yaxin, G., Xianggang, L., Jinlong, J., Ping, M., Yuezhou, W. (2025). One-pot hydrothermal synthesis of MnO2/zeolite composite and its efficacy in Sr2+ removal. Arabian Journal of Chemistry. https://doi.org/10.25259/ajc_59_2025
