Effect of Surface Chemistry, Solution pH, and Ionic Strength on the Removal of Herbicides Diuron and Amitrole from Water by an Activated Carbon Fiber

A study was conducted on the effects of carbon surface chemistry, solution pH, and ionic strength on the removal of diuron and amitrole from aqueous solutions by adsorption on an as-received and oxidized activated carbon fiber. Results obtained were explained by the surface characteristics of the ad...

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Bibliographic Details
Published in:Langmuir 2007-01, Vol.23 (3), p.1242-1247
Main Authors: Fontecha-Cámara, M. A, López-Ramón, M. V, Álvarez-Merino, M. A, Moreno-Castilla, C
Format: Article
Language:English
Subjects:
Adsorbents
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
Surface physical chemistry
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Summary:A study was conducted on the effects of carbon surface chemistry, solution pH, and ionic strength on the removal of diuron and amitrole from aqueous solutions by adsorption on an as-received and oxidized activated carbon fiber. Results obtained were explained by the surface characteristics of the adsorbents and the characteristics of the herbicide molecules. Under the experimental conditions used, diuron uptake was much higher than that of amitrole, despite its larger molecular dimensions, due to the lesser water solubility, greater hydrophobicity, and larger dipolar moment of diuron compared with amitrole. Uptake variations associated with differences in carbon surface oxidation, solution pH, and ionic strength were explained by corresponding changes in electrostatic, hydrophobic, and van der Waals interactions.
ISSN:0743-7463
1520-5827
DOI:10.1021/la062200f