At present, treatment of surface, underground and waste water is viewed as a high priority and many studies deal with this issue. Water can be contaminated by organic pollutants, inorganic pollutants, toxic, heavy metals and their compounds, and many other substances that do not degrade to non-toxic compounds in natural waters. Therefore, it is necessary to prevent accumulation of these substances in water and remove them from environment.In this respect, iron compounds in the high oxidation state (IV, V and VI), called ferrates, are very promising materials to water treatment. Especially, ferrates are able to remove hormones, such as estrogen, or medicines, for example antibiotics, from water. Reactions of ferrates with pollutants occur very quickly and thus, it is difficult to monitor the course of the reaction.This study brings a deeper insight into the mechanism of ferrate reactions with pollutants because, thanks to Mössbauer spectroscopy, we are able to in-situ observe the course of the reaction. Moreover, analyzing the input materials, intermediates and also final products of reaction is possible once this technique is employed. In this regard, the application of Mössbauer spectroscopy for monitoring the reaction of ferrate(VI) with arsenic for removal of arsenic from environment is mentioned.Keywords: Water treatment, ferrates, Mössbauer spectroscopy
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