Cesium sorption on UO2: systematic experimental and model studies for surface sites characterization.

被引：0

作者：

Rodriguez-Villagra, N. ^{[1
,2
]}

Alonso, U. ^{[1
]}

Cobos, J. ^{[1
]}

机构：

[1] Ctr Invest Energet Medioambientales & Tecnol CIEMA, Ave Complutense 40, Madrid 28040, Spain

[2] CSIC, Estn Biol Donana, Ave Americo Vespucio 26, Seville 41092, Spain

来源：

JOURNAL OF NUCLEAR MATERIALS | 2025年 / 606卷

关键词：

Surface sites density; Acid-base titration; Deep geological repository; Spent nuclear fuel; Geological disposal; UO2; URANIUM-OXIDES; ADSORPTION; DENSITIES;

D O I：

10.1016/j.jnucmat.2025.155614

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The maximum sorption capacity of Cs+ onto the powdered UO2 surface, obtained from experimental sorption isotherms (0.1 mol L- 1 NaClO4 at 25 degrees C and pH=6.3), was found to be 6.3 center dot 10- 5 mol center dot g- 1 . Potentiometric titration data, also in 0.1 mol L- 1 NaClO4, were modeled using the double diffuse layer model, yielding acidity constants of pKa1= 3.2 f 0.15 and pKa2=-10.8 f 0.15. The dissolution of UO2 at pH between 2 and 12 was measured at a solid-to-liquid ratio of 40 g center dot L-1 in 0.1 mol L- 1 NaClO4 and the determined solubility product obtained was pK s,U (OH)4 =-(3.2 f 0.2).

引用

页数：4

共 47 条

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