Synthesis of Goethite α-FeOOH Particles by Air Oxidation of Ferrous Hydroxide Fe(OH)2 Suspensions: Insight on the Formation Mechanism

Klupp Taylor R, Encina ER, Distaso M, Taylor RNK, Peukert W (2015)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2015

Journal

Crystal Growth & Design American Chemical Society

Book Volume: 15

Pages Range: 194-203

Journal Issue: 1

DOI: 10.1021/cg501191h

Abstract

Iron oxide and iron oxyhydroxide particles, particularly, the goethite \textgreeka-FeOOH phase, are environmentally friendly materials and are used in various technological applications as adsorbents, precursors of Fe powders for magnetic recording media, and pigments. In this work, the formation process of \textgreeka-FeOOH by air oxidation of Fe(OH)2 suspensions has been studied. The effects of the air flow rate, as well as of the reactant concentration ratio, R (=[(OH)$-$]/[Fe(II)]), on the reaction product were analyzed. It has been found that the morphology and the size of the \textgreeka-FeOOH particles can be modified by means of the air flow rate. Furthermore, by performing a detailed microscopic analysis of the morphology of the initial, intermediate, and final reaction products, we have obtained evidence of epitaxial growth of \textgreeka-FeOOH on the Fe(OH)2 substrate. It is suggested that the similarity between the anion arrangements in both phases facilitates this process. Based on these results, a pathway for the formation of \textgreeka-FeOOH in highly alkaline medium is proposed in which the size and shape of the initial Fe(OH)2 particles plays a significant role in the formation the \textgreeka-FeOOH particles obtained upon completion of the oxidation process.

Authors with CRIS profile

Robin Klupp Taylor Professur für Nanostructured Particles Ezequiel Roberto Encina Lehrstuhl für Partikelsynthese (LFG) Monica Distaso Sonderforschungsbereich 953/3 Synthetische Kohlenstoffallotrope Wolfgang Peukert Lehrstuhl für Partikelsynthese (LFG)

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials (EAM) Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)

How to cite

APA:

Klupp Taylor, R., Encina, E.R., Distaso, M., Taylor, R.N.K., & Peukert, W. (2015). Synthesis of Goethite α-FeOOH Particles by Air Oxidation of Ferrous Hydroxide Fe(OH)2 Suspensions: Insight on the Formation Mechanism. Crystal Growth & Design, 15(1), 194-203. https://doi.org/10.1021/cg501191h

MLA:

Klupp Taylor, Robin, et al. "Synthesis of Goethite α-FeOOH Particles by Air Oxidation of Ferrous Hydroxide Fe(OH)2 Suspensions: Insight on the Formation Mechanism." Crystal Growth & Design 15.1 (2015): 194-203.

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