硝酸溶液中镎在硅胶上的吸附行为研究
ADSORPTION BEHAVIOR OF NEPTUNIUM ON SILICA GEL IN NITRIC ACID SOLUTION
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摘要: 研究了硝酸溶液中Np(Ⅳ),Np(Ⅴ)和Np(Ⅵ)在硅胶上的吸附行为。实验结果表明,三种价态的镎在硅胶上吸附2～4h达到平衡;镎在硅胶上的吸附分配系数随温度的升高而增加;氧化还原剂初始浓度对镎在硅胶上的吸附影响不大;三种价态的镎的吸附规律符合Langmuir吸附等温线,镎在硅胶上的吸附属于单分子层吸附。从吸附热的数据可判断三种价态的镎在硅胶上的吸附属于化学吸附,为吸热过程。Abstract: The adsorption behavior of Np(Ⅳ), Np(Ⅴ) and Np(Ⅵ) on silica gel in nitric acid solutions is studied.The results show that the adsorption equilibrium can be reached within 2 to 4 hours.Adsorption distribution coefficients increase with the increasing of temperature.The concentrations of redox reagents have light effects on adsorption within the studied concentration range.The adsorption isotherm of neptunium on silica gel corresponds to the form of Langmuir isotherm.From the data of adsorption heat it is concluded that the adsorption of neptunium on silica gel in nitric acid solutions belongs to chemical adsorption and the adsorption process is an endothermic reaction.
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