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Artículo

Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dye

Zanini, Graciela PilarIcon ; Avena, Marcelo JavierIcon ; Fiol, Sarah; Arce, Florencio
Fecha de publicación: 04/2006
Editorial: Pergamon-Elsevier Science Ltd
Revista: Chemosphere
ISSN: 0045-6535
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
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Resumen

The binding between an oxazine dye and a humic acid was studied in aqueous solutions in the pH range 4-10 and in the supporting electrolyte (KCl) range 0.001-0.1 M. A rather simple spectrophotometric method was developed to construct binding isotherms under conditions were traditional centrifugation or filtration methods fail. The use of this method is possible because humic acid molecules have the ability of changing the spectrum of dye molecules, and this ability is used to quantify the isotherms. All binding isotherms have a Langmuirian shape. The amount of bound dye is strongly dependent on the ionic strength and less dependent on the pH of the solution. The binding is rather strong and mainly driven by non-electrostatic forces. Whereas the Langmuir binding constant is independent of the pH and electrolyte concentration, the number of assessable sites in humic acid for binding oxazine increases by increasing pH and decreasing electrolyte concentration. These results can be directly related to the flexibility of humic acid molecules, which can swell at high pH and low ionic strength, increasing consequently the availability of binding sites. The results also indicate that humic substances may strongly affect the mobility and fate of dyes and related pollutants in the environment.
Palabras clave: BINDING ISOTHERMS , DYES , HUMIC SUBSTANCES , ORGANIC POLLUTANTS
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/95348
DOI: http://dx.doi.org/10.1016/j.chemosphere.2005.08.053
URL: https://www.sciencedirect.com/science/article/pii/S0045653505011288
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Articulos(INQUISUR)
Articulos de INST.DE QUIMICA DEL SUR
Citación
Zanini, Graciela Pilar; Avena, Marcelo Javier; Fiol, Sarah; Arce, Florencio; Effects of pH and electrolyte concentration on the binding between a humic acid and an oxazine dye; Pergamon-Elsevier Science Ltd; Chemosphere; 63; 3; 4-2006; 430-439
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