银基分子筛对放射性碘的吸附性能研究

Study on the high efficiency adsorption of silver based molecular sieves for radioiodine

以具有代表性的放射性单质碘和甲基碘作为吸附质,考察了银基分子筛对其的静态吸附容量和吸附热、动力学,通过SEM、EDX mapping、XPS测试材料的微观形貌、元素组成,对吸附机理进行了分析。结果表明,该材料在常温下对单质碘和甲基碘吸附容量分别可达1000,380 mg/g,对甲基碘的吸附过程符合准二级动力学方程和Langmuair吸附等温模型。银基分子筛通过化学吸附处理痕量的放射性碘,而对于较高浓度的放射性碘主要的吸附方式为物理吸附。

The representative radioactive elemental iodine and methyl iodine are selected as adsorbates,and the static adsorption capacity,adsorption heat and kinetics of silver based molecular sieves are investigated.The micro morphology,element composition and adsorption mechanism of the materials are characterized and analyzed by SEM,EDX mapping and XPS tests.The results show that the adsorption capacity of the material for elemental iodine and methyl iodine at room temperature can reach 1000 mg/g and 380 mg/g respectively,and the adsorption process for methyl iodine conforms to the quasi second order kinetic equation and Langmuair adsorption isotherm model.Silver based molecular sieves process trace radioactive iodine through chemical adsorption,while the main adsorption mode for higher concentration radioactive iodine is physical adsorption.