Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions

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To elucidate the influence of bi-substitution on the structural and hyperfine properties of goetites, two series of (Al,Co)- and (Mn,Co)-substituted goethites were synthesized in alkaline media by aging several ferrihydrites with different Al/Co and Mn/Co ratios. The samples were fully characterized...

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Autores principales:	Tufo, Ana Elisabeth, Ramos, Cinthia Paula, Sileo, Elsa Ester
Publicado:	2015
Materias:	Al- Co- Co-ferrite Hyperfine properties Mn-goethites Multi-substitution Rietveld refinement Adsorption Alkalinity Aluminum Chemical analysis Cobalt Crystallite size Ferrite Particle size Particle size analysis Scanning electron microscopy Specific surface area Structural properties X ray diffraction BET surface area measurement Co ferrites Hyperfine characterization Hyperfine magnetic fields Hyperfines Inhomogeneous distribution Ssbauer spectroscopies Technological applications Manganese adsorption aluminum cobalt dissolution ferrite goethite ion isotopic ratio manganese particle size Rietveld analysis size distribution
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00092541_v414_n_p16_Alvarez http://hdl.handle.net/20.500.12110/paper_00092541_v414_n_p16_Alvarez
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00092541_v414_n_p16_Alvarez
record_format	dspace
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Al- Co- Co-ferrite Hyperfine properties Mn-goethites Multi-substitution Rietveld refinement Adsorption Alkalinity Aluminum Chemical analysis Cobalt Crystallite size Ferrite Particle size Particle size analysis Rietveld refinement Scanning electron microscopy Specific surface area Structural properties X ray diffraction BET surface area measurement Co ferrites Hyperfine characterization Hyperfine magnetic fields Hyperfines Inhomogeneous distribution Ssbauer spectroscopies Technological applications Manganese adsorption aluminum cobalt dissolution ferrite goethite ion isotopic ratio manganese particle size Rietveld analysis size distribution
spellingShingle	Al- Co- Co-ferrite Hyperfine properties Mn-goethites Multi-substitution Rietveld refinement Adsorption Alkalinity Aluminum Chemical analysis Cobalt Crystallite size Ferrite Particle size Particle size analysis Rietveld refinement Scanning electron microscopy Specific surface area Structural properties X ray diffraction BET surface area measurement Co ferrites Hyperfine characterization Hyperfine magnetic fields Hyperfines Inhomogeneous distribution Ssbauer spectroscopies Technological applications Manganese adsorption aluminum cobalt dissolution ferrite goethite ion isotopic ratio manganese particle size Rietveld analysis size distribution Tufo, Ana Elisabeth Ramos, Cinthia Paula Sileo, Elsa Ester Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
topic_facet	Al- Co- Co-ferrite Hyperfine properties Mn-goethites Multi-substitution Rietveld refinement Adsorption Alkalinity Aluminum Chemical analysis Cobalt Crystallite size Ferrite Particle size Particle size analysis Rietveld refinement Scanning electron microscopy Specific surface area Structural properties X ray diffraction BET surface area measurement Co ferrites Hyperfine characterization Hyperfine magnetic fields Hyperfines Inhomogeneous distribution Ssbauer spectroscopies Technological applications Manganese adsorption aluminum cobalt dissolution ferrite goethite ion isotopic ratio manganese particle size Rietveld analysis size distribution
description	To elucidate the influence of bi-substitution on the structural and hyperfine properties of goetites, two series of (Al,Co)- and (Mn,Co)-substituted goethites were synthesized in alkaline media by aging several ferrihydrites with different Al/Co and Mn/Co ratios. The samples were fully characterized by chemical analyses, X-ray diffraction (XRD) and Mössbauer spectroscopy; scanning electron microscopy (SEM), zeta potential and BET surface area measurements were also performed. All the solids presented only an α-FeOOH-like structure, with the exception of two preparations with high Co concentrations that developed two phases, goethite and small amounts of the Co-ferrite (CoFe2O4). The cell parameters in the Co-substituted goethites were markedly smaller than that of the pure sample indicating a oxidation of Co(II) to Co(III) before the incorporation step. In the Co+Mn series the metal substitution followed the trend Co~Mn, and in the Co+Al series the trend was Al>Co, and in both cases the incorporation of Co decreased the crystallite size of the samples. The metal-for-Fe incorporation changed the specific surface areas and the morphology of the acicular formed particles. Cobalt containing samples had the highest SSA, while Mn-containing samples had the lowest SSA. The IEP values of the bi-substituted samples were similar to that of pure α-FeOOH, but mono-substitution by Mn and Al diminished the isoelectric points. The low IEP values detected in Mn-goethite (5.8) and Al-goethite (5.2) could be respectively ascribed to an inhomogeneous distribution of Mn(III), and to the different basicity properties of the surface Fe-OH and Al-OH groups. The hyperfine magnetic field Bhf, increased quasi linearly with the incorporation of Co in both series. In the Co-Mn series the effect was attributed to variations in particle size distribution, in contrast the marked increase observed in the Co-Al series can be attributed to the decrease in the content of diamagnetic ion Al(III). The results indicate that simultaneous substitutions produce substantial changes in the structural, surface and hyperfine properties of goethites. As the characteristics of the dissolution and adsorption processes of the goethites greatly depend on particle size, BET areas and surface charge of the solids, the reported results will allow us to predict changes in the chemical reactivity and adsorption of the multi-substituted goethites. Also the data on hyperfine properties will help to elucidate the probable substitution in natural samples. The fact that Co-incorporation in bi-substituted samples greatly decreased the particle size increasing the specific surface area is an important parameter for technological applications in adsorption removal processes. © 2015 Elsevier B.V.
author	Tufo, Ana Elisabeth Ramos, Cinthia Paula Sileo, Elsa Ester
author_facet	Tufo, Ana Elisabeth Ramos, Cinthia Paula Sileo, Elsa Ester
author_sort	Tufo, Ana Elisabeth
title	Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
title_short	Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
title_full	Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
title_fullStr	Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
title_full_unstemmed	Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
title_sort	chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00092541_v414_n_p16_Alvarez http://hdl.handle.net/20.500.12110/paper_00092541_v414_n_p16_Alvarez
work_keys_str_mv	AT tufoanaelisabeth chemicalstructuralandhyperfinecharacterizationofgoethiteswithsimultaneousincorporationofmanganesecobaltandaluminumions AT ramoscinthiapaula chemicalstructuralandhyperfinecharacterizationofgoethiteswithsimultaneousincorporationofmanganesecobaltandaluminumions AT sileoelsaester chemicalstructuralandhyperfinecharacterizationofgoethiteswithsimultaneousincorporationofmanganesecobaltandaluminumions
_version_	1768544301726302208
spelling	paper:paper_00092541_v414_n_p16_Alvarez2023-06-08T14:33:39Z Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions Tufo, Ana Elisabeth Ramos, Cinthia Paula Sileo, Elsa Ester Al- Co- Co-ferrite Hyperfine properties Mn-goethites Multi-substitution Rietveld refinement Adsorption Alkalinity Aluminum Chemical analysis Cobalt Crystallite size Ferrite Particle size Particle size analysis Rietveld refinement Scanning electron microscopy Specific surface area Structural properties X ray diffraction BET surface area measurement Co ferrites Hyperfine characterization Hyperfine magnetic fields Hyperfines Inhomogeneous distribution Ssbauer spectroscopies Technological applications Manganese adsorption aluminum cobalt dissolution ferrite goethite ion isotopic ratio manganese particle size Rietveld analysis size distribution To elucidate the influence of bi-substitution on the structural and hyperfine properties of goetites, two series of (Al,Co)- and (Mn,Co)-substituted goethites were synthesized in alkaline media by aging several ferrihydrites with different Al/Co and Mn/Co ratios. The samples were fully characterized by chemical analyses, X-ray diffraction (XRD) and Mössbauer spectroscopy; scanning electron microscopy (SEM), zeta potential and BET surface area measurements were also performed. All the solids presented only an α-FeOOH-like structure, with the exception of two preparations with high Co concentrations that developed two phases, goethite and small amounts of the Co-ferrite (CoFe2O4). The cell parameters in the Co-substituted goethites were markedly smaller than that of the pure sample indicating a oxidation of Co(II) to Co(III) before the incorporation step. In the Co+Mn series the metal substitution followed the trend Co~Mn, and in the Co+Al series the trend was Al>Co, and in both cases the incorporation of Co decreased the crystallite size of the samples. The metal-for-Fe incorporation changed the specific surface areas and the morphology of the acicular formed particles. Cobalt containing samples had the highest SSA, while Mn-containing samples had the lowest SSA. The IEP values of the bi-substituted samples were similar to that of pure α-FeOOH, but mono-substitution by Mn and Al diminished the isoelectric points. The low IEP values detected in Mn-goethite (5.8) and Al-goethite (5.2) could be respectively ascribed to an inhomogeneous distribution of Mn(III), and to the different basicity properties of the surface Fe-OH and Al-OH groups. The hyperfine magnetic field Bhf, increased quasi linearly with the incorporation of Co in both series. In the Co-Mn series the effect was attributed to variations in particle size distribution, in contrast the marked increase observed in the Co-Al series can be attributed to the decrease in the content of diamagnetic ion Al(III). The results indicate that simultaneous substitutions produce substantial changes in the structural, surface and hyperfine properties of goethites. As the characteristics of the dissolution and adsorption processes of the goethites greatly depend on particle size, BET areas and surface charge of the solids, the reported results will allow us to predict changes in the chemical reactivity and adsorption of the multi-substituted goethites. Also the data on hyperfine properties will help to elucidate the probable substitution in natural samples. The fact that Co-incorporation in bi-substituted samples greatly decreased the particle size increasing the specific surface area is an important parameter for technological applications in adsorption removal processes. © 2015 Elsevier B.V. Fil:Tufo, A.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ramos, C.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Sileo, E.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00092541_v414_n_p16_Alvarez http://hdl.handle.net/20.500.12110/paper_00092541_v414_n_p16_Alvarez

Chemical, structural and hyperfine characterization of goethites with simultaneous incorporation of manganese, cobalt and aluminum ions

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