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

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:451

Article

Mejia-Santillan, M. E.^1,2  Pariona, N.³  Bravo-C, J.²  Herrera-Trejo, M.¹  Montejo-Alvaro, F.¹  Zarate, A.⁴  Perry, D. L.⁵  Mtz-Enriquez, A. I.^1,4 

[1] Ctr Invest & Estudios Avanzados, IPN Unidad Saltillo, Av Ind Met 1062,Parque Ind Ramos Arizpe, Saltillo 25900, Coahuila, Mexico

[2] Univ Nacl Mayor San Marcos, Lab Anal Suelos, Lima, Peru

[3] Inst Ecol AC, Red Estudios Mol Avanzados, Carretera Antigua Coatepec 351, Xalapa 91070, Veracruz, Mexico

[4] Univ Catolica Norte, Fac Ciencias, Dept Fis, Casilla 1280, Antofagasta, Chile

[5] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

关键词: Maghemite;    Sorption properties;    First-order reversal curve (FORC) diagrams;    Mossbauer spectroscopy;    Diffuse reflectance;   

DOI  :  10.1016/j.jmmm.2017.11.111

来源: Elsevier

【 摘 要 】

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, Mossbauer 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 submicroparticles are capable of efficiently decreasing the arsenic content in water from 100 ppb to below the World Health Organization (WHO) guideline of 10 ppb. (C) 2017 Elsevier B. V. All rights reserved.

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