Synthesis of Hematite (α-Fe₂O₃) Nanostructures by Thermal Oxidation of Iron Sheet for Cr (VI) Adsorption

Abstract:

In this study, hematite (α-Fe₂O₃) nanostructures were synthesized via thermal oxidation of Fe sheet in dry air and in water vapor. SEM images show nanoblades and nanowires growing on the surface of the sheet. Samples synthesized in water vapor generally produced larger nanostructures while samples oxidized in higher temperatures formed taller and slender nanostructures. The α-Fe₂O₃ nanostructures were used as adsorbent for Cr (VI) in acidic medium. Chromium removal was highest with the samples synthesized at 650°C in water vapor with 95% efficiency. Kinetic and thermodynamic studies revealed that the adsorption process strongly followed pseudo-second order kinetics model and is endothermic. The process also follows the Langmuir adsorption isotherm model, suggesting that the process is described by homogeneous, monolayer adsorption. Adsorption of Cr (VI) onto hematite may be attributed to the electrostatic reaction between the positively charged hematite adsorbent and negative chromium ion.

• Periodical: Key Engineering Materials (Volume 775)
• Pages: 395-401
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.775.395
• Online since: August 2018
• Authors: Christian Laurence E. Aquino*, Mikko James C. Bongar, Anfernee B. Silvestre, Mary Donnabelle L. Balela
• Keywords: Cr (VI) Adsorption, Hematite Nanostructures, Thermal Oxidation

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