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

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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.