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Remediation of Cr(VI) by biogenic magnetic nanoparticles: An x-ray magnetic circular dichroism study

The contamination of groundwater by toxic Cr(VI) ions is a topic of major international concern. In this paper the remediation of Cr(VI) was investigated by exploiting the high surface area and redox potential of biomineralised magnetite nanoparticles. Using state-of-the-art x-ray synchrotron techniques it was possible to show that Cr(VI) was reduced at the magnetite surface and incorporated into the nanoparticles in a non-toxic form as Cr(III), thus demonstrating the huge potential of these nanoparticles for remediation applications. Many other groups have since followed up this work and the paper was selected as a Biophysics highlight for the journal.