在铁 (氧化) 氧化物上吸附期间的抗同位素分离
Jiabei Luo1,2, Xianjun Xie1,2, Jianbo Shi1,2
1State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution, China University of Geosciences, Wuhan 430078, China.
Environmental science & technology
|December 23, 2023
概括
在Sb (V) 吸附到铁 (oxyhydr) 氧化物时,发生了反 (Sb) 同位素分离. 这项研究揭示了吸附机制,并为未来的Sb同位素研究提供了基础.
科学领域:
- 地质化学 地质化学
- 环境科学 环境科学
- 同位素地球化学 同位素地球化学
背景情况:
- 反 (Sb) 的命运受到吸附过程的显著影响.
- 对于吸附过程中的Sb同位素分离及其潜在机制的了解有限.
研究的目的:
- 在铁 (氧化) 氧化物上实验性地研究Sb(V) 吸附.
- 阐明与这种吸附过程相关的Sb同位素分离效应和机制.
主要方法:
- 实验研究了Sb(V) 吸附在铁酸盐和酸盐上的作用.
- 利用扩展的X射线吸收细结构 (EXAFS) 分析来确定吸附复杂结构.
- 运用密度函数理论 (DFT) 来计算吉布斯自由能量和梅耶尔债券顺序.
主要成果:
- 在吸附过程中观察到显著的Sb同位素分离,对于铁和戈石 (Δ123Sb_solution-mineral = 1.20 ± 0.02‰和2.35 ± 0.04‰,分别) 的不同程度.
- 已识别的内球表面复合,包括单核双边缘共享 (2E) 和双核双角共享 (2C) 复合体.
- 建立了Sb-Fe原子距离,结合强度 (Sb(OH) 6- > 2E > 2C) 和同位素分离的程度之间的相关性.
结论:
- 在Sb (V) 吸附到铁 (oxyhydr) 氧化物时,证实了Sb同位素分离.
- 结合环境和结构配置决定了Sb同位素分离机制.
- 这项研究为未来对同位素及其分离过程的研究奠定了基础.
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