Chemistry Journal of Moldova

DOI: dx.doi.org/10.19261/cjm.2010.05(2).10

Graphical Abstract: Using the Mossbauer spectroscopy and other physical methods it was demonstrated the presence of different iron compounds like β-FeOOH, α-Fe₂O₃, and jarosite mineral type compounds: (R₄N,H₃O)[Fe₃(OH)₆(SO₄)₂] or coordination modes: {RCOO-Fe(L4)-OOCR}1+, {R-CO₂=Fe(X₂)=O₂C-R}n, {R-COO-Fe(X₄)-OOC-R}n, and {(-NCH₂CH₂N-)= Fe(X₂) =(-NCH₂CH₂N-)}, where X= H₂O, OH^-, SO₄^2-., n= from 3- to 1+ in the ion-exchange resins (KU-2, AN-31, AV-17, Varian – AD, EDE-10P) after the contact with sulphate of iron(III) solutions at different conditions: type of solvent, temperature, air atmosphere. In special conditions the ultrafine superparamagnetic particles of Fe₂O₃ have been obtained.


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