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TZUNTIL:20230326T010000Z
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DTSTART:20201025T030000
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RDATE:20211031T030000
RDATE:20221030T030000
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DTSTAMP:20260831T155058Z
DESCRIPTION:Antimony is a contaminant of increasing scientific interest. Al
 though it is already known that Sb mobility is greatly influenced by Fe hy
 droxides\, this study is the first to investigate its effect on the produc
 t of the oxidation of Fe(II) containing solutions. The products of the rap
 id oxidation of Fe(II) in aerated solutions at pH 7 at molar ratios of Fe:
 Sb of 100:1\, 25:1\, 10:1\, 4:1 and a Sb free control treatment were ident
 ified as lepidocrocite at higher and as feroxyhyte at lower Fe:Sb ratios v
 ia XRD and TEM measurements. Additional PO43- extractions and a desorption
  experiment using the dried solids originating from the oxidation experime
 nt verified the hypothesis that instead of surface adsorption\, up to up t
 o 16.21 mol% of the Fe(III) had been substituted by Sb(V) in the crystal s
 tructure. This caused structural disorder in the lepidocrocite crystals an
 d resulted in the switch to feroxyhyte as reaction product at ratios of Fe
 :Sb 10:1 and lower. An additional desorption experiment revealed a very lo
 w remobilization due to the incorporation into the crystal structure. This
  is the first evidence of feroxyhyte formation from Fe(II) oxidation\, and
  the high degree of substitution introduces coprecipitation as a promising
  new approach for the treatment of Sb-contaminated waters.
DTSTART;TZID=Europe/Berlin:20210614T090000
DTEND;TZID=Europe/Berlin:20210614T235959
LOCATION:Zoom
SUMMARY:Sven FreiLaura Wegner: Ferrous iron oxidation in the presence of an
 timonate: Mutual effects on iron mineral products and antimony sequestrati
 on
TRANSP:TRANSPARENT
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