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)
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Abstract
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 |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| 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 |
| Publisher: | Elsevier |
| ISSN: | 0045-6535 |
| ISSN (Online): | 1879-1298 |
| Published Online: | 07 October 2014 |
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