混乱的麦金诺石 (FeSm) 的结构演化及其对吸收的影响
Sookyung Kim1, Young-Soo Han2, Kim F Hayes3
1Department of Geological Sciences, BK21 School of Earth and Environmental Systems, Pusan National University, Busan 46241, South Korea.
Environmental science & technology
|November 11, 2025
概括
衰老失调的麦克纳石 (FeSm) 影响的去除,随着时间的推移,效率下降. 这项研究揭示了FeSm和物种变化的结构变化,挑战其作为静态吸收剂的作用.
科学领域:
- 环境化学环境化学
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
背景情况:
- 无序的麦克纳石 (FeSm) 在硫化环境中对的封存至关重要.
- 对于FeSm的结构演变及其对吸附的影响仍然不太了解.
研究的目的:
- 在各种pH条件下研究FeSm对吸附的老化影响.
- 确定FeSm在老化过程中的结构变化及其对物种形成的影响.
主要方法:
- 使用铁和的K边缘X射线吸收光谱 (XAS).
- 在pH值4.9-9.1下检查的吸收,在60天内含量为1mM.
主要成果:
- 铁的老化导致缺陷愈合和颗粒生长,降低了去除效率.
- 在中性和基本pH下,As (III) 的去除显著下降,而As (V) 的去除在所有pH下降.
- 衰老促进了对硫化的零价 (As(0) 形成,特别是在酸性至中性pH下.
结论:
- FeSm是一种动态的吸收剂,而不是静态的吸收剂,老化会显著改变其分离能力.
- 了解FeSm的结构演变是提高长期去除策略的关键.
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