Boron separation performance by adsorption on bimetallic MIL-100 series materials

Metal-organic framework (MOF) materials exhibit excellent boron adsorption and isotope separation abilities, but their mechanisms are still unclear and require additional research. In this study, MIL-100(Fe), which has excellent comprehensive performance in boron adsorption and isotope separation among MOF materials, was selected to systematically investigate its boron adsorption and isotope separation performance. Based on this material, five MIL-100 (Fe 3+ , X 2+ ) bimetallic materials were prepared by doping different divalent metal ions, and the changes in the adsorption and separation capacities before and after doping were compared. The influence of different metal doping on adsorption was investigated. It was found that doping metal ions effectively increased the coordination of unsaturated metal sites in the materials, which improved the adsorption process and caused positive and effective isotopic separation. The isotopic separation factor of doping the alkali earth metal ion Ca 2+ was increased significantly from 1.033 to 1.092.