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Np(V) 在伊利特杜普伊表面的保留

Bianca Schacherl¹, Claudia Joseph¹, Aaron Beck¹

¹Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany.

Environmental science & technology

|July 17, 2023

概括

结构性铁增强了伊利特杜普伊粘土上海的保留,促进了Np的吸附和部分减少到Np. 这对于理解富含粘土的环境中海王星的迁移至关重要.

科学领域:

地质化学地质化学
环境科学环境科学
核化学核化学核化学

背景情况:

了解海王星 (Np) 在粘土环境中的迁移对于核废物管理至关重要.
粘土矿物质,特别是伊利特,在放射性核酸保留中起着重要作用.
结构性铁对粘土中的NP特异和吸附的影响需要进一步研究.

研究的目的:

调查海 (V) 保持机制在伊利特杜普伊 (IdP).
确定结构Fe (II) /Fe (III) 在IdP中对Np吸附和物种化的作用.
在存在IdP时,评估Np (V) 降低到Np (IV) 的潜力.

主要方法:

批量吸附实验使用IdP,怀俄明石和无铁蒙莫里隆石进行.
铁基边缘X射线吸收近边缘结构 (XANES) 和Fe Mössbauer光谱学证实了结构铁.
溶剂提取,Np M₅边缘高能分辨率 (HR-) XANES和Np L₃边缘扩展的X射线吸收细结构 (EXAFS) 用于分析NP特异和协调.

主要成果:

与其他粘土矿物质相比,IdP表现出更高的NP吸附亲和力.
随着pH值的下降,NPp (IV) 的比率增加,在pH值5.5时达到 (24±2) %.
Np特种化分析表明Np (IV/V) 混合物和协调到Fe─O实体,这表明Np (V) 通过结构Fe (II) 减少到Np (IV).

结论:

在IdP中的结构Fe (II) /Fe (III) 显著增强了Np (V) 吸收.
铁 (II/III) 粘土边缘地点作为强大的Np (V) 表面复合伙伴.
通过结构性Fe (II) 将吸附的Np (V) 部分减少到Np (IV) 是一个关键的保留机制.

关键词:

粘土的粘土,就是粘土.扩散扩散是一种扩散.高能分辨率的X射线吸收近边缘结构 (HR-XANES) 光谱学.这就是海王星Neptunium.溶剂提取提取溶剂提取吸收吸收吸收吸收

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