Homogeneous thin layers of lepidocrocite, green rust incorporating chloride anions (GRCl GR1) and green rust incorporating sulphate anions (GRSO4 GR2) were successfully electrodeposited onto tin dioxide substrate (SnO2).
Characterisation of green rust was done through FTIR, TEM, XRD and Mössbauer spectroscopy.
It was oxidised later into carbonated green rust GR CO32−) by dissolved O2.
A key role for green rust in the Precambrian oceans and the genesis of iron formations.
Oxidation of iron leads to the formation of green rust as intermediate product and ferrihydrite as ultimate product.
The synthesis via GR consists in converting a green rust thin film into lepidocrocite thin film by galvanostatic oxidation.
Corrosion deposits were characterized by a specific structure built of iron sulfides (FeS), sulfated green rust (GR SO42−)), magnetite (Fe3O4), Fe III) oxyhydroxides (FeOOH), chukanovite (Fe2(OH)2carbonatedonated green rust (GR CO32−)) and some calcareous deposits.
Three oxidation products have been obtained, siderite, am-FeOOH with adsorbed carbonate or bicarbonate ions and green rust GR1 CO3).
The predominant compound was α-FeOOH in the 25%/saturation soil, carbonate green rust in the saturated soil.
These experiments show the potential of green rust in mine water treatment, especially as it is able to remove problematic elements such as Al and Zn.
Natural green rust was added to different mine waters as either a wet, reduced material or a dry, partially oxidised material.
