
TY  - JOUR
A1  - Atkinson, RJ 
T1  - The formation of iron(III) oxide hydroxides from iron(II) oxalate
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1976
VL  - 29
IS  - 10
SP  - 2149
EP  - 2158
KW  - 
UR  - https://doi.org/10.1071/CH9762149 
N2  - FeC2O4,2H2O(s) suspensions in sodium hydroxide solutions were oxidized by a fast air-bubble flow at room temperature until complete reaction had occurred. With amounts of NaOH in the range OH/Fe initial mole ratio &#8804;1.0, the reaction is     FeC2O4, 2H2(s)+ OH-(aq)+ ¼O2(g) &#8594; &#8532;&#947;FeOOH(s)+1/3Fe(C2O4)33-(aq)+13/6H2O  With OH/Fe mole ratio &#8805; 2.0 the reaction is     FeC2O4, 2H2(s)+ 2OH-(aq)+ ¼O2(g) &#8594; &#945;FeOOH(s)+(C2O4)33-(aq)+ 5/2 H2O    Mixtures of goethite (&#945;-FeOOH) and lepidocrocite (&#947;-FeOOH) form at intermediate OH/Fe mole ratio. The oxidation process occurs in a solid-phase intermediate product. Comparisons with similar oxidations of iron(11)sulphate solutions showed that &#947;-FeOOH formation was favoured and &#945;-FeOOH formation inhibited in the iron(11) oxalate oxidation. These differences are related to pH and dissolved iron concentrations. 
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