Adsorption characteristics of a phenoxy acetic acid herbicide on activated carbon.
The adsorption of 2,4-dichlorophenoxyacetic acid (2,4-D) by two powdered coal activated carbons was studied in aqueous solution. The modelling of the adsorption equilibrium showed that the adsorption of 2,4-D fitted a Langmuir isotherm. Adsorption was influenced by the activated carbon type, adsorbent concentration and solution characteristics. The adsorption was found to decrease with an increase in pH over the range 1.5-9. Maximum adsorption occurred at pH approximately 2.5, which corresponds to the 2,4-D pKa value. The amount of 2,4-D adsorbed was also found to depend on the NaCl concentration.
Laboratoire de Chimie Physique (Equipe Photocatalyse et Environnement), Université Ibnou Zohr, Faculté des Sciences, Agadir,  Morocco.
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M
Belmouden
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Assabbane
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YA
Ichou
D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry*; D000327:Adsorption; D002606:Charcoal; D004784:Environmental Monitoring; D006540:Herbicides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration
D006540:Herbicides; D002606:Charcoal; D015084:2,4-Dichlorophenoxyacetic Acid