氧化-氧化物固体溶液在水系统中的溶解
Taishi Kobayashi1, Yutaro Sato1, Ryutaro Tonna1
1Department of Nuclear Engineering, Kyoto University, Kyotodaigaku-katsura, Nishikyo-ku, Kyoto 615-8540, Japan. kobayashi@nucleng.kyoto-u.ac.jp.
Dalton transactions (Cambridge, England : 2003)
|October 30, 2024
概括
固体溶液和水溶液系统中的氧化还原反应是复杂的. 这项研究揭示了减少剂如何影响氧化物溶解,形成一种减缓过程的保护层.
科学领域:
- 材料科学 材料科学 材料科学
- 地质化学 地质化学
- 核工程 核工程是指核工程.
背景情况:
- 固溶液水溶液 (SSAS) 系统涉及同时发生溶解/沉和氧化还原反应.
- 了解SSAS系统需要对固体溶液溶解有机学的见解,特别是对氧化还原活性成分.
- 氧化-氧化物固体溶液 ((Zr,Ce) O2/(Ce,Zr) O2) 由于 (Ce(III/IV) 的氧化还原活性,在核工业中至关重要.
研究的目的:
- 为了研究氧化物固体溶液的溶解行为.
- 阐明氧化还原反应在溶解过程中的作用,特别是Ce (IV) 减少为Ce (III) 的作用.
- 描述固体阶段,了解溶解过程中保护层的形成.
主要方法:
- 使用粉末X射线衍射 (PXRD) 与瑞特维尔德分析对固态相的全面表征.
- 带有因子分析的X射线吸收光谱学 (XAS) 来确定氧化状态和物种化.
- 在含有或不含减少剂的水溶液中,对溶解行为的实验研究.
主要成果:
- 固体溶液主要由四角-Zr,Ce) O2和立方-Zr,Ce) O2.2组成.
- 浸水在固体-液体界面上启动溶解.
- 将降解剂降低表面Ce (IV) 添加到Ce (III) 中,促进Ce的溶解.
- Ce释放将剩余的固体相与Zr进行丰富,增加了其不可溶性.
- 在固体表面形成了一层保护层,阻碍了进一步的溶解.
结论:
- 氧化-氧化物固体溶液的溶解受到涉及的氧化还原反应的显著影响.
- 将Ce (IV) 降低到Ce (III) 的表面降低增强了的释放,但同时形成了丰富的不溶性层.
- 这种保护层起到屏障作用,最终减缓了固体溶液的整体溶解速度.
更多相关视频
08:29Multi-material Ceramic-Based Components – Additive Manufacturing of Black-and-white Zirconia Components by Thermoplastic 3D-Printing (CerAM - T3DP)
Published on: January 7, 2019
11.3K
09:35Dispersion of Nanomaterials in Aqueous Media: Towards Protocol Optimization
Published on: December 25, 2017
28.3K
相关概念视频
Intermolecular Forces in Solutions
33.1K
The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
33.1K
Recrystallization: Solid–Solution Equilibria
1.0K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
1.0K
Solution Formation
31.4K
There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride.
This selective...
This selective...
31.4K
Factors Affecting Solubility
33.2K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.2K
Common Ion Effect
41.2K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
41.2K
Chemical Reactions in Aqueous Solutions
60.2K
Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
60.2K
