Thiocyanate adsorption on ferrihydrite and its fate during ferrihydrite transformation to hematite and goethite

Vu, H. P. and Moreau, J. W. (2015) Thiocyanate adsorption on ferrihydrite and its fate during ferrihydrite transformation to hematite and goethite. Chemosphere, 119, pp. 987-993. (doi: 10.1016/j.chemosphere.2014.09.019) (PMID:25303658)

Full text not currently available from Enlighten.


Thiocyanate (SCN−) is a toxic contaminant produced by industrial processes such as gold ore cyanidation and coal coking. The potential for remediation by adsorption of SCN− on ferrihydrite, the influence of sulfate (SO42−) on SCN− adsorption, and the fate of adsorbed SCN− during ferrihydrite aging were studied using macroscopic techniques complemented with attenuated total reflectance–Fourier transform infrared analysis (ATR–FTIR), X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). Results showed that adsorption of SCN− was strongly affected by the concentration of electrolyte (NaNO3) and pH, with decreases in concentration of NaNO3 and pH leading to increased SCN− adsorption. The adsorption isotherms can be described by the Langmuir model. While at lower concentrations (0.52–1.04 mM), the presence of SO42− had little impact on SCN− adsorption, at a higher concentration (2.08 mM), SCN− adsorption was significantly inhibited. ATR–FTIR data confirmed that SCN− was bound as an outer-sphere complex on ferrihydrite, and this mechanism was not influenced by changes in pH or electrolyte concentration. XRD data showed that ferrihydrite transformed to a mixture of hematite and goethite at 75 °C and pH 5 in the presence and absence of SCN−. Partitioning data revealed that during ferrihydrite transformation, all adsorbed SCN− was released into solution.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Moreau, Dr John
Authors: Vu, H. P., and Moreau, J. W.
College/School:College of Science and Engineering > School of Geographical and Earth Sciences > Earth Sciences
Journal Name:Chemosphere
ISSN (Online):1879-1298
Published Online:07 October 2014

University Staff: Request a correction | Enlighten Editors: Update this record