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Magnetic properties of biogenic selenium nanomaterials

  • Emerging Trends in Biotechnology for Sustainable Development and Pollution Prevention
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Abstract

Bioreduction of selenium oxyanions to elemental selenium is ubiquitous; elucidating the properties of this biogenic elemental selenium (BioSe) is thus important to understand its environmental fate. In this study, the magnetic properties of biogenic elemental selenium nanospheres (BioSe-Nanospheres) and nanorods (BioSe-Nanorods) obtained via the reduction of selenium(IV) using anaerobic granular sludge taken from an upflow anaerobic sludge blanket (UASB) reactor treating paper and pulp wastewater were investigated. The study indicated that the BioSe nanomaterials have a strong paramagnetic contribution with some ferromagnetic component due to the incorporation of Fe(III) (high-spin and low-spin species) as indicated by electron paramagnetic resonance (EPR). The paramagnetism did not saturate up to 50,000 Oe at 5 K, and the hysteresis curve showed the coercivity of 100 Oe and magnetic moment saturation around 10 emu. X-ray photoelectron spectroscopy (XPS) and EPR evidenced the presence of Fe(III) in the nanomaterial. Signals for Fe(II) were observed neither in EPR nor in XPS ruling out its presence in the BioSe nanoparticles. Fe(III) being abundantly present in the sludge likely got entrapped in the extracellular polymeric substances (EPS) coating the biogenic nanomaterials. The presence of Fe(III) in BioSe nanomaterial increases the mobility of Fe(III) and may have an effect on phytoplankton growth in the environment. Furthermore, as supported by the literature, there is a potential to exploit the magnetic properties of BioSe nanomaterials in drug delivery systems as well as in space refrigeration.

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All the data generated in this study has been included in this article.

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Acknowledgments

The authors express gratitude to Dr YM Frappart (University of Paris Descartes, France) for his help in EPR data recording.

Funding

The design of the study and collection of data was supported through Erasmus Mundus Joint Doctorate Environmental Technologies for Contaminated Solids, Soils, and Sediments (ETeCoS3) (FPA no. 2010-0009). The analysis and interpretation of data and writing of the manuscript were supported by the fellowship provided by the Ministry of Human Resource Development (MHRD), Government of India, to the first author to pursue her PhD.

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RD carried out data analysis and interpretation. RD critically analyzed the data and wrote the manuscript with support from AG. NJ, SW, and DS carried out XPS experiments. EG and SG carried out EPR and magnetism experiments, respectively. RJ conceptualized the study and prepared samples for analysis with support from NJ and SW. PL supervised the study.

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Correspondence to Rewati Dixit or Rohan Jain.

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The authors declare that they have no competing interests.

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Responsible Editor: Santiago V. Luis

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Dixit, R., Gupta, A., Jordan, N. et al. Magnetic properties of biogenic selenium nanomaterials. Environ Sci Pollut Res 28, 40264–40274 (2021). https://doi.org/10.1007/s11356-020-11683-2

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  • DOI: https://doi.org/10.1007/s11356-020-11683-2

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