Physics and Chemistry of Minerals

, Volume 45, Issue 9, pp 907–913 | Cite as

Study of Cr(VI) adsorption onto magnetite nanoparticles using synchrotron-based X-ray absorption spectroscopy

  • Yen-Hua Chen
  • Dian-Yu Liu
  • Jyh-Fu Lee
Original Paper


In this study, the efficiency of Cr(VI) adsorption onto nano-magnetite was examined by batch experiments, and the Cr(VI) adsorption mechanism was investigated using synchrotron-based X-ray absorption spectroscopy. Magnetite nanoparticles with a mean diameter of 10 nm were synthesized using an inexpensive and simple co-precipitation method. It shows a saturation magnetization of 54.3 emu/g, which can be recovered with an external magnetic field. The adsorption data fitted the Langmuir adsorption isotherm well, implying a monolayer adsorption behavior of Cr(VI) onto nano-magnetite. X-ray absorption spectroscopy results indicate that the adsorption mechanism involves electron transfer between Fe(II) in nano-magnetite (Fe2+OFe3+2O3) and Cr(VI) to transform into Cr(III), which may exist as an Fe(III)–Cr(III) mixed solid phase. Moreover, the Cr(III)/Cr(VI) ratio in the final products can be determined by the characteristic pre-edge peak area of Cr(VI) in the Cr K-edge spectrum. These findings suggest that nano-magnetite is effective for Cr(VI) removal from wastewater because it can transform highly poisonous Cr(VI) species into nontoxic Cr(III) compounds, which are highly insoluble and immobile under environmental conditions.


Nano-magnetite Cr(VI) adsorption X-ray absorption spectroscopy 


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018
corrected publication June 2018

Authors and Affiliations

  1. 1.Department of Earth SciencesNational Cheng Kung UniversityTainanTaiwan
  2. 2.National Synchrotron Radiation Research CenterHsinchuTaiwan

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