Adsorption of iron cyanide complexes onto clay minerals, manganese oxide, and soil.
J Environ Sci Health A Tox Hazard Subst Environ Eng
; 45(11): 1391-6, 2010 Sep.
Article
en En
| MEDLINE
| ID: mdl-20665323
ABSTRACT
The adsorption characteristics of an iron cyanide complex, soluble Prussian blue KFe(III)[Fe(II)(CN)(6)], were evaluated for representative soil minerals and soil at pH 3.7, 6.4 and 9.7. Three specimen clay minerals (kaolinite, montmorillonite, and illite), two synthesized manganese oxides (birnessite and cryptomelane), and a Drummer soil from Indiana were used as the adsorbents. Surface protonation of variable charge sites increased with decreasing pH yielding positively charged sites on crystal edges and enhancing the attractive force between minerals and iron cyanide complexes. Anion adsorption on clays often is correlated to the metal content of the adsorbent, and a positive relationship was observed between iron or aluminum content and Prussian blue adsorption. Illite had high extractable iron and adsorbed more ferro-ferricyande anion, while kaolinite and montmorillonite had lower extractable iron and adsorbed less. However, less pH effect was observed on the adsorption of iron cyanide to manganese oxides. This may due to the manganese oxide mediated oxidation of ferrocyanide [Fe(II)(CN)(6)(4-)], to ferricyanide [Fe(III)(CN)(6)(3-)], which has a low affinity for manganese oxides.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Óxidos
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Contaminantes del Suelo
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Residuos Peligrosos
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Compuestos de Manganeso
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Silicatos de Aluminio
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Ferricianuros
Idioma:
En
Revista:
J Environ Sci Health A Tox Hazard Subst Environ Eng
Asunto de la revista:
TOXICOLOGIA
Año:
2010
Tipo del documento:
Article
País de afiliación:
Estados Unidos