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Reanalysis of the Schwertmannite structure and the incorporation of SO42- groups: An IR, XAS, WAXS and simulation study
Schwertmannite is a poorly crystallized iron oxyhydroxide with essential structural sulfate that can be a major component in acid mine drainage environments. Original characterization work concluded that the sulfate was largely contained within tunnels of an ordered akaganeite-like structure based on powder XRD, analysis of IR spectra, and sulfate extraction procedures [1]. Since the original description, problems have emerged with the nature of the tunnel sulfate, and with the interpretation of the IR spectra. Other related work has shown that it is now possible to determine sulfate-iron oxide inner sphere binding unambiguously from the S K-edge XANES spectrum. Hence a reassessment of the evidence for the original schwertmannite structure was deemed necessary and timely
Characterization of NOM and its adsorption by iron oxide coated sand (IOCS) using UV and fluorescence spectroscopy
[[abstract]]The removal of natural organic matter (NOM) by adsorption onto iron oxide coated sand (IOCS) can be interpreted based on analysis of the absorbance and fluorescence spectra of the water before and after treatment. The useful spectral parameters include SUVA254, the widths of the benzenoid and electron transfer absorbance bands (WBz, and WET, respectively), the ratio of the absorbance intensities of these two bands (AET/ABz), and the wavelength of the emission maximum (λmaxem). These parameters appear to reflect both the activated aromatic content in the sample and its average molecular weight, and are good indicators of the adsorbability of NOM onto IOCS. A multi-parametric spectroscopic approach for online monitoring of NOM and its reactions can be valuable for both practical treatment studies and for fundamental explorations of NOM reactivity.[[incitationindex]]SCI[[incitationindex]]EI[[booktype]]紙