Enhanced detoxification of Cr6+ by Shewanella oneidensis via adsorption on spherical and flower-like manganese ferrite nanostructures

Diana S. Raie; Ioannis Tsonas; Melisa Canales; Stefanos Mourdikoudis; Konstantinos Simeonidis; Antonis Makridis; Dimitrios Karfaridis; Shanom Ali; Georgios Vourlias; Peter Wilson; Laurent Bozec; Lena Ciric; Nguyen Thi Kim Thanh

doi:10.1039/D2NA00691J

Enhanced detoxification of Cr⁶⁺ by Shewanella oneidensis via adsorption on spherical and flower-like manganese ferrite nanostructures†

Diana S. Raie,

^ab Ioannis Tsonas,^c Melisa Canales,^d Stefanos Mourdikoudis,

^ab Konstantinos Simeonidis,^e Antonis Makridis,^e Dimitrios Karfaridis,^e Shanom Ali,

^f Georgios Vourlias,^e Peter Wilson,^f Laurent Bozec,^g Lena Ciric^d and Nguyen Thi Kim Thanh

*^ab

Author affiliations

* Corresponding authors

^a Biophysics Group, Department of Physics and Astronomy, University College London, Gower Street, London, UK
E-mail: ntk.thanh@ucl.ac.uk
Web: http://www.ntk-thanh.co.uk

^b UCL Healthcare Biomagnetics and Nanomaterials Laboratories, 21 Albemarle Street, London, UK

^c UCL Electronic and Electrical Engineering, UCL, Gower Street, London, UK

^d Healthy Infrastructure Research Group, Department of Civil, Environmental & Geomatic Engineering, UCL, Gower Street, London, UK

^e Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

^f Environmental Research Laboratory, ClinicalMicrobiology and Virology, University College London Hospitals NHS Foundation Trust, London, UK

^g Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada

Abstract

Maximizing the safe removal of hexavalent chromium (Cr⁶⁺) from waste streams is an increasing demand due to the environmental, economic and health benefits. The integrated adsorption and bio-reduction method can be applied for the elimination of the highly toxic Cr⁶⁺ and its detoxification. This work describes a synthetic method for achieving the best chemical composition of spherical and flower-like manganese ferrite (Mn_xFe_3−xO₄) nanostructures (NS) for Cr⁶⁺ adsorption. We selected NS with the highest adsorption performance to study its efficiency in the extracellular reduction of Cr⁶⁺ into a trivalent state (Cr³⁺) by Shewanella oneidensis (S. oneidensis) MR-1. Mn_xFe_3−xO₄ NS were prepared by a polyol solvothermal synthesis process. They were characterised by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectrometry (XPS), dynamic light scattering (DLS) and Fourier transform-infrared (FTIR) spectroscopy. The elemental composition of Mn_xFe_3−xO₄ was evaluated by inductively coupled plasma atomic emission spectroscopy. Our results reveal that the oxidation state of the manganese precursor significantly affects the Cr⁶⁺ adsorption efficiency of Mn_xFe_3−xO₄ NS. The best adsorption capacity for Cr⁶⁺ is 16.8 ± 1.6 mg Cr⁶⁺/g by the spherical Mn_0.2²⁺Fe_2.8³⁺O₄ nanoparticles at pH 7, which is 1.4 times higher than that of Mn_0.8Fe_2.2O₄ nanoflowers. This was attributed to the relative excess of divalent manganese in Mn_0.2²⁺Fe_2.8³⁺O₄ based on our XPS analysis. The lethal concentration of Cr⁶⁺ for S. oneidensis MR-1 was 60 mg L⁻¹ (determined by flow cytometry). The addition of Mn_0.2²⁺Fe_2.8³⁺O₄ nanoparticles to S. oneidensis MR-1 enhanced the bio-reduction of Cr⁶⁺ 2.66 times compared to the presence of the bacteria alone. This work provides a cost-effective method for the removal of Cr⁶⁺ with a minimum amount of sludge production.

This article is part of the themed collection: Celebrating International Women’s Day: Women in Nanoscience

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Enhanced detoxification of Cr⁶⁺ by Shewanella oneidensis via adsorption on spherical and flower-like manganese ferrite nanostructures†

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