UO2溶解在二碳酸盐溶液中与H2O2:温度的影响.
John McGrady1, Yuta Kumagai1, Yoshihiro Kitatsuji1
1Nuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA) Tokai Ibaraki 319-1195 Japan j.mcgrady@kyotofusioneering.com kumagai.yuta@jaea.go.jp.
RSC advances
|September 25, 2023
概括
温度会影响地下水中的二氧化 (UO2) 溶解. 由于表面物种形成和变化的过氧化分解,较高的温度会减少 (UVI) 在二碳酸盐溶液中的溶解,超过1毫米.
科学领域:
- 核废物管理 核废物管理
- 地质化学 地质化学
- 材料科学是一种材料科学.
背景情况:
- 消耗的核燃料 (UO2) 在容器故障时可以与地下水接触.
- 地下水氧化剂,如过氧化 (H2O2),驱动UO2的氧化溶解.
- 二碳酸盐 (HCO3-) 是一种常见的地下水成分,影响了UO2的行为.
研究的目的:
- 研究温度对二氧化碳酸盐溶液中UO2氧化溶解的影响.
- 分析H2O2分解率和UVI溶解在各种温度和碳酸盐度.
- 确定温度对使用过核燃料长期稳定性的影响.
主要方法:
- 在UO2表面对H2O2分解的实验分析.
- 在二碳酸盐溶液 (0.1-50 mM) 中测量溶解的UVI度.
- 温度变化实验 (10°C至60°C).
主要成果:
- 溶解UVI在二碳酸盐度≥1mM时随着温度的增加而降低.
- 在更高的温度下观察到UVI二碳酸盐表面物种的形成和转向催化H2O2分解.
- 在0.1毫米碳酸盐下,温度与U溶解没有明显的相关性,归因于表面物种的变化.
结论:
- 温度显著影响二氧化碳含有地下水中的二氧化溶解率.
- 了解这些取决于温度的机制对于预测储存库中废核燃料的行为至关重要.
- 一个拟议的途径解释了UO2溶解的变化与温度和二碳酸盐度.
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