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Ferrate(VI)-prompted removal of metals in aqueous media: mechanistic delineation of enhanced efficiency via metal entrenchment in magnetic oxides.
Environ Sci Technol. 2015 Feb 17; 49(4):2319-27.ES

Abstract

The removal efficiency of heavy metal ions (cadmium(II), Cd(II); cobalt(II), Co(II); nickel(II), Ni(II); copper(II), Cu(II)) by potassium ferrate(VI) (K2FeO4, Fe(VI)) was studied as a function of added amount of Fe(VI) (or Fe) and varying pH. At pH = 6.6, the effective removal of Co(II), Ni(II), and Cu(II) from water was observed at a low Fe-to-heavy metal ion ratio (Fe/M(II) = 2:1) while a removal efficiency of 70% was seen for Cd(II) ions at a high Fe/Cd(II) weight ratio of 15:1. The role of ionic radius and metal valence state was explored by conducting similar removal experiments using Al(III) ions. The unique combination of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), in-field Mössbauer spectroscopy, and magnetization measurements enabled the delineation of several distinct mechanisms for the Fe(VI)-prompted removal of metal ions. Under a Fe/M weight ratio of 5:1, Co(II), Ni(II), and Cu(II) were removed by the formation of MFe2O4 spinel phase and partially through their structural incorporation into octahedral positions of γ-Fe2O3 (maghemite) nanoparticles. In comparison, smaller sized Al(III) ions got incorporated easily into the tetrahedral positions of γ-Fe2O3 nanoparticles. In contrast, Cd(II) ions either did not form the spinel ferrite structure or were not incorporated into the lattic of iron(III) oxide phase due to the distinct electronic structure and ionic radius. Environmentally friendly removal of heavy metal ions at a much smaller dosage of Fe than those of commonly applied iron-containing coagulants and the formation of ferrimagnetic species preventing metal ions leaching back into the environment and allowing their magnetic separation are highlighted.

Authors+Show Affiliations

Regional Centre of Advanced Technologies and Materials, Departments of Physical Chemistry and Experimental Physics, Faculty of Science, Palacký University , Šlechtitelů 11, 783 71 Olomouc, Czech Republic.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25607569

Citation

Prucek, Robert, et al. "Ferrate(VI)-prompted Removal of Metals in Aqueous Media: Mechanistic Delineation of Enhanced Efficiency Via Metal Entrenchment in Magnetic Oxides." Environmental Science & Technology, vol. 49, no. 4, 2015, pp. 2319-27.
Prucek R, Tuček J, Kolařík J, et al. Ferrate(VI)-prompted removal of metals in aqueous media: mechanistic delineation of enhanced efficiency via metal entrenchment in magnetic oxides. Environ Sci Technol. 2015;49(4):2319-27.
Prucek, R., Tuček, J., Kolařík, J., Hušková, I., Filip, J., Varma, R. S., Sharma, V. K., & Zbořil, R. (2015). Ferrate(VI)-prompted removal of metals in aqueous media: mechanistic delineation of enhanced efficiency via metal entrenchment in magnetic oxides. Environmental Science & Technology, 49(4), 2319-27. https://doi.org/10.1021/es5048683
Prucek R, et al. Ferrate(VI)-prompted Removal of Metals in Aqueous Media: Mechanistic Delineation of Enhanced Efficiency Via Metal Entrenchment in Magnetic Oxides. Environ Sci Technol. 2015 Feb 17;49(4):2319-27. PubMed PMID: 25607569.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ferrate(VI)-prompted removal of metals in aqueous media: mechanistic delineation of enhanced efficiency via metal entrenchment in magnetic oxides. AU - Prucek,Robert, AU - Tuček,Jiří, AU - Kolařík,Jan, AU - Hušková,Ivana, AU - Filip,Jan, AU - Varma,Rajender S, AU - Sharma,Virender K, AU - Zbořil,Radek, Y1 - 2015/02/04/ PY - 2015/1/22/entrez PY - 2015/1/22/pubmed PY - 2015/10/20/medline SP - 2319 EP - 27 JF - Environmental science & technology JO - Environ Sci Technol VL - 49 IS - 4 N2 - The removal efficiency of heavy metal ions (cadmium(II), Cd(II); cobalt(II), Co(II); nickel(II), Ni(II); copper(II), Cu(II)) by potassium ferrate(VI) (K2FeO4, Fe(VI)) was studied as a function of added amount of Fe(VI) (or Fe) and varying pH. At pH = 6.6, the effective removal of Co(II), Ni(II), and Cu(II) from water was observed at a low Fe-to-heavy metal ion ratio (Fe/M(II) = 2:1) while a removal efficiency of 70% was seen for Cd(II) ions at a high Fe/Cd(II) weight ratio of 15:1. The role of ionic radius and metal valence state was explored by conducting similar removal experiments using Al(III) ions. The unique combination of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), in-field Mössbauer spectroscopy, and magnetization measurements enabled the delineation of several distinct mechanisms for the Fe(VI)-prompted removal of metal ions. Under a Fe/M weight ratio of 5:1, Co(II), Ni(II), and Cu(II) were removed by the formation of MFe2O4 spinel phase and partially through their structural incorporation into octahedral positions of γ-Fe2O3 (maghemite) nanoparticles. In comparison, smaller sized Al(III) ions got incorporated easily into the tetrahedral positions of γ-Fe2O3 nanoparticles. In contrast, Cd(II) ions either did not form the spinel ferrite structure or were not incorporated into the lattic of iron(III) oxide phase due to the distinct electronic structure and ionic radius. Environmentally friendly removal of heavy metal ions at a much smaller dosage of Fe than those of commonly applied iron-containing coagulants and the formation of ferrimagnetic species preventing metal ions leaching back into the environment and allowing their magnetic separation are highlighted. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/25607569/Ferrate_VI__prompted_removal_of_metals_in_aqueous_media:_mechanistic_delineation_of_enhanced_efficiency_via_metal_entrenchment_in_magnetic_oxides_ L2 - https://doi.org/10.1021/es5048683 DB - PRIME DP - Unbound Medicine ER -