Physical and arsenic adsorption properties of maghemite and magnetite sub-microparticles

M. E. Mejia-Santillan, N. Pariona, J. Bravo-C., M. Herrera-Trejo, F. Montejo-Alvaro, A. Zarate, D. L. Perry, A. I. Mtz-Enriquez

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


The topotactic transformation from magnetite to maghemite sub-microparticles was demonstrated by a variety of techniques that include X-ray diffraction, Raman spectroscopy, electron microscopy, Mössbauer spectroscopy, magnetic measurements, and vis-NIR diffuse reflectance. The physical, chemical, and morphological properties of the particles were correlated with their adsorptive properties in water with respect to arsenic (V). The adsorptive properties of the iron oxide are increased by changing the crystal phases involved, specifically, the transformation of magnetite to maghemite. Maghemite sub-microparticles are capable of efficiently decreasing the arsenic content in water from 100 ppb to below the World Health Organization (WHO) guideline of 10 ppb.

Original languageEnglish
Pages (from-to)594-601
Number of pages8
JournalJournal of Magnetism and Magnetic Materials
StatePublished - 1 Apr 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.


  • Diffuse reflectance
  • First-order reversal curve (FORC) diagrams
  • Maghemite
  • Mossbauer spectroscopy
  • Sorption properties


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