Atomic scale structure and surface chemistry of Fe oxides/carbonates-based composites precipitated at various temperatures via urea-supported hydrothermal synthesis

摘要: Abstract This is the first report of atomic-scale structure in iron oxides/carbonates based composites produced at various autoclave temperatures from divalent Fe(II) precursor. It also one works which demonstrates how EXAFS simulation can be utilized to additionally characterize metal compound-based materials estimate their properties associated with surface reactivity. Here we examine greatly temperature within a practical range 120–180 °C affects composition, structure, chemistry and adsorptive anion removal three Fe-oxides/carbonates-built synthesized via urea-supported hydrothermal precipitation. Divalent precursor was used promote redox transformations consequently increase number phases/compounds. Complementary tools EXAFS, XPS FTIR allowed entire regardless crystallinity. defined that strongly influenced both ratios between two substances (Fe oxides Fe carbonates) each material speciation compound. Stronger reducing conditions higher intensified generation FeCO3-containing fraction growing 20.6 56.2–75.6% fabricated 120, 150 180 °C, respectively. In neither composites, local around simulated using oscillations reproduced arrangement any known individual phase oxide or carbonate. The data on performance samples six aqueous anions supported recently proposed methodological suggestion associates an extended x-ray absorption fine main atoms (here, Fe) outer shells exchange ability. this paper, made another observation for time relates further fitted solely O physisorbed water.