来自海洋沉积物的纳米晶体酸中加多的原子尺度结构
Alain Manceau1,2, Andrea Giacomelli2, Yan Li1
1European Synchrotron Radiation Facility (ESRF) 38043 Grenoble France alain.manceau@esrf.fr.
概括
深海沉积物中的稀土元素和伊特 (REY) 不存在于无酸盐,而是无形矩阵中. 这种原子结构解释了通过酸液的容易回收,这对于资源提取至关重要.
科学领域:
- 海洋地质学 海洋地质学
- 地质化学 地质化学
- 材料科学是一种材料科学.
背景情况:
- 深海沉积物中含有重要的稀土元素和 (REY) 在酸盐中.
- 了解REY的原子结构对于高效的提取和加工至关重要.
- 目前的方法缺乏对这些沉积物中REY的化学形式的原子级洞察力.
研究的目的:
- 为了阐明REY沉积物中加多 (Gd) 的原子尺度局部结构.
- 为了研究深海酸中REY的化学形式和粘合环境.
- 了解REY的结构对矿产加工和回收的影响.
主要方法:
- 高能分辨率光检测扩展的X射线吸收细结构 (HERFD-EXAFS) 光谱.
- 密度函数理论 (DFT) 的计算.
- 对来自克拉里安-克利珀顿断裂区 (CCFZ) 的REY沉积物的分析.
主要成果:
- 加多 (Gd) 不被纳入阿帕结构或作为Ce-PO4沉物.
- Gd与Ca和PO4结合在一个无形矩阵内的有缺陷的 apatite-like环境中.
- 在无形矩阵内,Gd和Y很可能在中等距离上分离,而不是分散.
- REY被困在无形矩阵中解释了由于结构不稳定性而通过酸漏容易恢复.
结论:
- HERFD-EXAFS和DFT是用于复杂矩阵中微量元素的原子级分析的强大补充工具.
- 在CCFZ沉积物中,REY的无形矩阵结构促进了酸和回收.
- 这项研究为了解海洋环境中的REY丰富和回收提供了显微基础.
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