Investigation on the elementary process of organic molecules ? iron oxide minerals interaction based on nanoscale interfacial characterization

考察了氧化铁矿物赤铁矿(Fe2O)和针铁矿(FeOOH)的粒度、形貌和聚集状态对其表面化学状态和化学反应活性的影响。针对赤铁矿，采用抗坏血酸和透射电子显微镜进行批量实验，研究赤铁矿的溶解速度与晶体形态和大小的关系。对于针铁矿，用原子力显微镜和X射线光电子能谱分析了针铁矿的晶体形态和表面化学组成，并用不同的温度合成了针铁矿样品。综上所述，针状、片状和小颗粒(50 Nm)等高度各向异性的形貌对氧化铁矿物的表面化学和化学反应活性有显著影响。

We investigated the influence of particle size, morphology and aggregation state on surface chemical state and chemical reactivity of the most typical iron oxide minerals, hematite (Fe2O3) and goethite (FeOOH). For hematite, this study focuses on the relation between the dissolution rate of hematite and crystal morphology and size by batch experiment using ascorbic acid and TEM. For goethite, crystal morphology and surface chemistry were examined using AFM and XPS; the analyzed goethite samples were synthesized by different temperature. In summary, highly anisotropic morphology such as needle- and platelet-shape and small particle size (< 50 nm) significantly affect the surface chemistry and chemical reactivity of iron oxide minerals.