Magnetically-modified natural biogenic iron oxides for organic xenobiotics removal

0440669 - ÚVGZ 2016 RIV IR eng J - Journal Article
Šafařík, Ivo - Filip, J. - Horská, Kateřina - Nowakova, M. - Tuček, J. - Šafaříková, Miroslava - Hashimoto, H. - Takada, J. - Zbořil, R.
Magnetically-modified natural biogenic iron oxides for organic xenobiotics removal.
International Journal of Environmental Science and Technology. Roč. 12, č. 2 (2015), s. 673-682. ISSN 1735-1472. E-ISSN 1735-2630
R&D Projects: GA MŠMT(CZ) LH11111; GA MŠMT LH12190
Institutional support: RVO:67179843
Keywords : Biogenic iron oxides * Leptothrix ochracea * Magnetic fluid * Magnetic adsorbents * Xenobiotics
Subject RIV: EI - Biotechnology ; Bionics
Impact factor: 2.344, year: 2015

Biogenic iron oxides have been collected from a water stream and subsequently magnetically modified using water-based magnetic fluid. Both natural and magnetically modified materials have been characterized in detail using wavelength dispersive X-ray fluorescence spectrometry, X-ray powder diffraction, Mössbauer spectroscopy, electron microscopy and BET surface area measurements. The natural material is composed of 2-line ferrihydrite, forming hollow microtubules—sheaths of Leptothrix ochracea, and detrital components. As a result of the ferrofluid modification, maghemite nanoparticles were identified on the surface of the treated material. The active surface area of the bulk, magnetically-modified sample was 148 m2 g−1. The magnetically modified material was tested as inexpensive magnetically responsive adsorbent for the removal of selected organic xenobiotics, namely organic dyes, from aqueous solutions. The observed maximum adsorption capacities ranged between 34.3 and 97.8 mg of dye per 1 g of adsorbent.
Permanent Link: http://hdl.handle.net/11104/0243826