Confirmation of the assignment of vibrations of goethite: An ATR and IES study of goethite structure

Liu, Haibo, Chen, Tianhu, Qing, Chengsong, Xie, Qiaoqin, & Frost, Ray L. (2013) Confirmation of the assignment of vibrations of goethite: An ATR and IES study of goethite structure. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 116, pp. 154-159.

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Transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM/EDS) and X-ray diffraction (XRD) were used to characterize the morphology of synthetic goethite. The behavior of the hydroxyl/water molecular units of goethite and its thermally treated products were characterized using Fourier transform-infrared emission spectroscopy (FT-IES) and attenuated total reflectance–Fourier transform infrared (ATR–FTIR) spectroscopy. The results showed that all the expected vibrational bands between 4000 and 650 cm−1 including the resolved bands (3800–2200 cm−1) were confirmed. A band attributed to a new type of hydroxyl unit was found at 3708 cm−1 and assigned to the FeO–H stretching vibration without hydrogen bonding. This hydroxyl unit was retained up to the thermal treatment temperature of 500 °C. On the whole, seven kinds of hydroxyl units, involving three surface hydroxyls, a bulk hydroxyl, a FeO–H without hydrogen bonding, a nonstoichiometric hydroxyl and a reversed hydroxyl were observed, and three kinds of adsorbed water were found in/on goethite.

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ID Code: 62801
Item Type: Journal Article
Refereed: Yes
Keywords: Goethite structure, Surface hydroxyls, Infrared spectroscopy, Hydroxyl, Hydrogen bonding
DOI: 10.1016/j.saa.2013.06.102
ISSN: 13861425
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Elsevier B.V.
Copyright Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, [Volume 116, (December 2013)] DOI: 10.1016/j.saa.2013.06.102
Deposited On: 25 Sep 2013 23:36
Last Modified: 04 Jan 2016 13:18

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