Hydrolysis of uranium and thorium in surface-modified bentonite under hydrothermal conditions

被引：10

作者：

Giaquinta, DM

Soderholm, L

Yuchs, SE

Wasserman, SR

机构：

[1] Chemistry Division, Argonne National Laboratory, Argonne, IL 60439-4831

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1997年 / 249卷 / 1-2期

关键词：

D O I：

10.1016/S0925-8388(96)02823-X

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The speciation of (UO2)(2+)- and Th4+-exchanged bentonite clay samples was probed by X-ray absorption spectroscopy (XAS). Surface modification reactions using hydrophobic silanes were performed in order to ascertain the effects of excluding the free exchange of external water from the clay gallery. Hydrothermal conditions were used to mimic potential geologic conditions in a nuclear waste storage facility. Both the (UO2)(2+) and Th4+ samples showed evidence of polymeric hydrolysis products similar to the fluorite structure known for both UO2 and ThO2.

引用

页码：142 / 145

页数：4

共 34 条

[1] SORPTION OF TRACE CONSTITUENTS FROM AQUEOUS-SOLUTIONS ONTO SECONDARY MINERALS .1. URANIUM [J].