Comparative analysis of the physical, chemical and structural characteristics and performance of manganese greensands
Outram, John G., Couperthwaite, Sara J., & Millar, Graeme J. (2016) Comparative analysis of the physical, chemical and structural characteristics and performance of manganese greensands. Journal of Water Process Engineering, 13, pp. 16-26.
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Greensands have found widespread use in the water treatment industry for the removal of pollutants such as dissolved iron and manganese. Nevertheless, a detailed understanding of the materials used in industry is currently lacking. There is a need to develop improved knowledge of their composition and physical properties in order to discover means of enhancing performance. This study focussed on the evaluation of five commercially available materials and used modern characterization methods such as X-ray diffraction, infrared spectroscopy, Raman microscopy, scanning electron microscopy, energy dispersive spectroscopy, X-ray fluorescence, particle size distribution and surface area measurements, to elucidate differences. None of the samples contained glauconite as a primary phase, in contrast to previous literature. Two samples were found to essentially be quartz supported manganese oxides and the remaining three were predominantly manganese oxide with low levels of hematite, phyllosilicate (montmorillonite) and quartz supports. The manganese species present were mainly pyrolusite (β-MnO2), ramsdellite (R-MnO2), hollandite (α-MnO2) [as cryptomelane (KMnIIMnIV8O16·H2O)] and romanechite ((Ba,H2O)2Mn5O10). Preliminary experiments for the removal of Mn(II) using the commercial greensands showed that the greensands behaviours and removal efficiencies differed greatly between the samples.
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|Item Type:||Journal Article|
|Keywords:||manganese greensand, characterization, manganese oxide coating, manganese removal, wastewater|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Catalysis and Mechanisms of Reactions (030601)|
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2016 Elsevier|
|Copyright Statement:||Licensed under the Creative Commons Attribution; Non-Commercial; No-Derivatives 4.0 International. DOI: 10.1016/j.jwpe.2016.07.006|
|Deposited On:||04 Oct 2016 23:55|
|Last Modified:||11 Oct 2016 04:52|
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