有机酸盐对短程有序铁纳米相的结构和组成的影响
Zhengzheng Chen1,2, Jeffrey Paulo H Perez1, Glen J Smales3
1GFZ German Research Center for Geosciences Telegrafenberg 14473 Potsdam Germany zhchen@gfz-potsdam.de jpperez@gfz-potsdam.de.
Nanoscale advances
|May 16, 2024
概括
有机酸盐 (OP) 显著改变化 (FHY) 纳米粒子的形成和特性. 增加酸盐水平减少了表面积,改变了铁酸盐的结合,影响了生物地质化学循环.
科学领域:
- 地质化学 地质化学
- 环境科学 环境科学
- 纳米技术 纳米技术
背景情况:
- 有机酸盐 (OP) 是细胞的重要营养素,与铁酸盐 (FHY) 等铁相相互作用.
- 铁 (FHY) 在生物地球化学过程中起着至关重要的作用,包括碳储存和铁储存.
- OP对FHY形成,结构和特性的影响在很大程度上仍然未被描述.
研究的目的:
- 研究一种模型有机酸盐,β-糖酸盐 (GP),如何影响铁酸盐 (FHY) 纳米颗粒的合成,结构和特性.
- 为了确定不同酸盐与铁 (P/Fe) 比率对GP-FHY沉物特性的影响.
- 阐明FHY与GP相互作用时的结合环境和结构变化.
主要方法:
- 在受控的名义摩拉P/Fe比率 (0.01到0.5) 上通过共沉合成GP-FHY纳米粒子.
- 使用测定固体P/Fe比率,特定表面积和孔隙结构的技术,对沉物进行表征.
- 使用光谱或衍射方法分析Fe-P局部结合环境和协调化学.
主要成果:
- 所有GP-FHY沉物都表现出0.22的最大固体P/Fe比率,无论最初的标称比率如何.
- 随着名义P/Fe比率的增加,特定表面积从290到3 m2g-1大幅下降,同时孔隙结构崩.
- Fe-P 键从低 P/Fe 的双牙双核转变为高 P/Fe 的单牙单核,改变了 Fe 多面体的协调和连接性.
结论:
- 在FHY形成过程中,GP阻碍了Fe的聚合,从而形成高度依赖P/Fe比率的结构.
- 在GP-FHY纳米相中观察到的结构和结合变化对它们在涉及Fe-P和碳物种的水生生地化学反应中的作用有影响.
- 了解这些相互作用对于预测自然环境中铁和的命运和功能至关重要.
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