Adsorption characteristics of a phenoxy acetic acid herbicide on activated carbon
- 9 May 2000
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Environmental Monitoring
- Vol. 2 (3) , 257-260
- https://doi.org/10.1039/a909357e
Abstract
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 ≈ 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.Keywords
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