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Mechanisms of nickel sorption on pyrophyllite: macroscopic and microscopic approaches

Scheidegger, A.M. (Univ. of Delaware, Newark, DE.) ; Fendorf, M ; Sparks, D.L

Soil Science Society of America Journal, 1996-11, Vol.60 (6), p.1763-1772 [Periódico revisado por pares]

Madison, WI: Soil Science Society of America

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Título:
Mechanisms of nickel sorption on pyrophyllite: macroscopic and microscopic approaches
Autor: Scheidegger, A.M. (Univ. of Delaware, Newark, DE.) ; Fendorf, M ; Sparks, D.L
Assuntos: 40 CHEMISTRY ; ADSORCION ; ADSORPTION ; ADSORPTION ISOTHERMS ; Agronomy. Soil science and plant productions ; ALUMINIO ; ALUMINIUM ; ALUMINIUM HYDROXIDES ; Applied sciences ; Biological and medical sciences ; Biological and physicochemical properties of pollutants. Interaction in the soil ; CARACTERISTICAS MORFOLOGICAS SUELO ; CATION ; CATIONES ; Contamination ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Fundamental and applied biological sciences. Psychology ; HIDROXIDOS ; HYDROXYDE ; ION ; IONES ; Ions ; KINETICS ; MATERIALS SCIENCE ; METAL ; METAL LOURD ; METALES ; METALES PESADOS ; MINERALES ; Mineralogy ; MINERAUX ; NICKEL ; NICKEL HYDROXIDES ; NIQUEL ; PH DEL SUELO ; PH DU SOL ; PH VALUE ; Pollution ; POLLUTION DU SOL ; POLUCION DEL SUELO ; PRECIPITACION QUIMICA ; PRECIPITATION CHIMIQUE ; PYROPHYLLITE ; Silicates ; Soil and sediments pollution ; Soil and water pollution ; Soil science ; Soils ; SORPTION ; TRAIT MORPHOLOGIQUE DU SOL ; TRANSMISSION ELECTRON MICROSCOPY ; Water ; X-RAY SPECTRA
É parte de: Soil Science Society of America Journal, 1996-11, Vol.60 (6), p.1763-1772
Notas: P33
T01
9708898
P32
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USDOE
AC03-76SF00098
Descrição: Retention of heavy metal ions on soil mineral surfaces is a crucial process for maintaining environmental quality. A thorough understanding of the sorption mechanisms of heavy metals on soil mineral surfaces is therefore of fundamental importance. This study examined Ni(II) sorption mechanisms on pyrophyllite. The removal of Ni from solution was studied as a function of pH (pH = 5-8.5), initial Ni concentration (1 X 10(-4) to 1 X 10(-2) M), and ionic strength (0.01-1 M). The data suggest that M sorption behavior can be divided into two distinct pH regions. In the lower pH region (i.e., pH 7), relative Ni sorption increased with decreasing ionic strength and initial Ni concentration. The adsorption maximum at pH 7), nickel sorption becomes slow and does not seem to be affected by the ionic strength and the initial N concentration. We employed high-resolution transmission electron microscopy (HRTEM) to ascertain whether any alteration in the surface structure of pyrophyllite could be detected after reaction with Ni at pH 7. Surface deposits, not present on untreated samples, were found. At low Ni sorption densities, surface precipitation seems to occur preferentially along the edges of the particles. Based on the HRTEM findings, and on results from a previous X-ray absorption fine structure spectroscopy (XAFS) study, we hypothesize that the formation of a mixed Ni-Al hydroxide phase on the pyrophyllite surface is responsible for the sorption behavior above pH 7
Editor: Madison, WI: Soil Science Society of America
Idioma: Inglês

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Mechanisms of nickel sorption on pyrophyllite: macroscopic and microscopic approaches

Scheidegger, A.M. (Univ. of Delaware, Newark, DE.) ; Fendorf, M ; Sparks, D.L

Madison, WI: Soil Science Society of America

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