Application of maghemite nanoparticles as sorbents for the removal of Cu(II), Mn(II) and U(VI) ions from aqueous solution in acid mine drainage conditions.

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dc.contributor.author Etale, A.
dc.contributor.author Tutu, H.
dc.contributor.author Drake, D.C.
dc.date.accessioned 2016-11-09T13:52:18Z
dc.date.available 2016-11-09T13:52:18Z
dc.date.issued 2016-06
dc.identifier.citation Etale, A., Tutu, H. and Drake, D.C. en_ZA
dc.identifier.issn 2190-5487 (Print)
dc.identifier.issn 2190-5495 (Online)
dc.identifier.uri http://hdl.handle.net/10539/21437
dc.description.abstract The adsorptive removal of Cu(II), Mn(II) and U(VI) by maghemite nanoparticles (NPs) was investigated under acid mine drainage (AMD) conditions to assess NP potential for remediating AMD-contaminated water. The effects of time, NP and metal concentration, as well as manganese and sulphate ions were quantified at pH 3. Adsorption of all three ions was rapid, and equilibrium was attained in 5 min or less. 56 % of Cu, 53 % of Mn and 49 % of U were adsorbed. In addition, adsorption efficiencies were enhanced by >= 10 % in the presence of manganese and sulphate ions, although Cu sorption was reduced in 1: 2 Cu-to-Mn solutions. Adsorption also increased with pH: 86 % Cu, 62 % Mn and 77 % U were removed from solution at pH 9 and increasing initial metal concentrations. Increasing NP concentrations did not, however, always increase metal removal. Kinetics data were best described by a pseudo-second-order model, implying chemisorption, while isotherm data were better fitted by the Freundlich model. Metal removal by NPs was then tested in AMD-contaminated surface and ground water. Removal efficiencies of up to 46 % for Cu and 54 % for Mn in surface water and 8 % for Cu and 50 % for Mn in ground water were achieved, confirming that maghemite NPs can be applied for the removal of these ions from AMD-contaminated waters. Notably, whereas sulphates may increase adsorption efficiencies, high Mn concentrations in AMD will likely inhibit Cu sorption. en_ZA
dc.language.iso en en_ZA
dc.publisher Springer en_ZA
dc.rights © The Author(s) 2014. This article is published with open access at Springerlink.com en_ZA
dc.subject Copper en_ZA
dc.subject Manganese en_ZA
dc.subject Uranium en_ZA
dc.subject Adsorption en_ZA
dc.subject Acid mine drainage en_ZA
dc.title Application of maghemite nanoparticles as sorbents for the removal of Cu(II), Mn(II) and U(VI) ions from aqueous solution in acid mine drainage conditions. en_ZA
dc.type Article en_ZA
dc.journal.volume 6 en_ZA
dc.journal.title Applied Water Science en_ZA
dc.description.librarian SP2016 en_ZA
dc.citation.doi 10.1007/s13201-014-0217-3 en_ZA
dc.citation.epage 197 en_ZA
dc.citation.issue 2 en_ZA
dc.citation.spage 187 en_ZA


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