Figure 5
XAFS spectroscopic data.
Normalized (edge jump 1) Fe K-edge XANES spectra of the SFeC material, together with Fe+3-oxide, -ohyxydroxide, - (hydrated)oxyhydroxide, -sulphate (hematite, goethite, ferrihydrite, jarosite) and Fe2+ reference materials (pyrite, Fe2+-chloride, Fe2+-sulphate). A natural mixed-valence phase, namely magnetite (Fe3O4), is also presented (a). Experimental Fe K-edge EXAFS signal of SFeC material together with the Fe K-edge EXAFS signals of the Fe3+ and Fe2+ reference materials, as processed using the Athena software (b). The Fourier transform (FT) of the Fe K-edge EXAFS spectrum of the SFeC material together with the FT of Fe-oxyhydroxide (goethite) and Fe-(hydrated) -oxyhydroxide (ferrihydrite) reference materials (c,d). Normalized As K-edge XANES spectra of the OAsL material, in comparison with As2S3 (orpiment), FeAsS (arsenopyrite), As2O3, NaAsO2, Ni3(AsO4)2.2H2O (annabergite) and FeAsO4.2H2O (scorodite) reference materials (e). The Fourier transform (FT) of the As K-edge EXAFS spectrum of the OAsL material together with the FT of the As2S3 (orpiment) reference material (f).
