Sunlight-Driven Transformation of Ferrihydrite via Ligand-to-Metal Charge Transfer: The Critical Factors and Arsenic Repartitioning

-edge EXAFS spectroscopy revealed that As was consecutively incorporated into the structures of goethite and lepidocrocite in the form of As(V) regardless of primary As speciation. These findings shed novel insights into low-crystalline iron oxide transformation and element migration driven by sunlight in natural environments.