金属有机骨架材料MIL-101用于气态碘单质的吸附与释放

摘要

Objective To study the adsorption and release of metal-organic framework MIL-101 for gaseous iodine. Methods Metal-organic framework MIL-101 was synthesized by hydrothermal synthesis method. The prepared MIL-101 was characterized by various techniques such as XRD, SEM, BET, TGA. Adsorption and release of the prepared met-al-organic framework MIL-101 for gaseous iodine was carried out at 75℃. The absorbed material was dissolved in ab-solute ethyl alcohol for iodine release.Results With the passage of the adsorption time, adsorption capacity of met-al-organic framework MIL-101 for gaseous iodine was gradually increased and reached saturated adsorption capacity of 2.61 g(I2)/g(MIL-101) at 8 h. With the passage of the time, iodine absorbed in the prepared material was released gradu-ally.Conclusion The adsorption and release of metal-organic framework MIL-101 for gaseous iodine under high temper-ature has an excellent effect, and it can be recycled in the process of enrichment of iodine. Therefore the material is suita-ble for the adsorption of radioactive gaseous iodide in the steam of nuclear power plant.%目的 研究金属有机骨架材料MIL-101对气态碘单质的吸附与释放.方法 采用水热合成法合成金属有机骨架材料MIL-101,并利用X射线衍射(XRD)、扫描电子显微镜(SEM)、N2吸附脱附等温线等表征方法 对合成的MIL-101样品进行表征.将制备的金属有机骨架材料MIL-101在75℃环境下对气态碘单质进行吸附,将吸附后的材料于无水乙醇溶液中进行碘单质的释放.结果 随着吸附时间的推移,金属有机骨架材料MIL-101对气态碘单质的吸附量逐渐升高,并于8 h逐渐达到饱和吸附量2.61 g(I2)/g(MIL-101).MIL-101在无水乙醇溶液中随着时间的延长,材料吸附的碘单质渐渐释放出来.结论 MIL-101对气态碘单质在较高温度下有着优异的吸附效果,并表现出良好的循环使用性能,适合用于核电站蒸汽中放射性气态碘的吸附.