Adsorption of 2,4-dichlorophenoxyacetic acid and 4-chloro-2-metylphenoxyacetic acid onto activated carbons derived from various lignocellulosic materials |
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| Authors: | Beata Doczekalska Krzysztof Ku?mierek Andrzej ?wi?tkowski Monika Bartkowiak |
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| Institution: | 1. Faculty of Wood Technology, Institute of Chemical Wood Technology, Poznań University of Life Sciences, Poznan, Poland;2. Faculty of Advanced Technologies and Chemistry, Institute of Chemistry, Military University of Technology, Warsaw, Poland |
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| Abstract: | Adsorption of 2,4-dichlorophenoxyacetic acid (2,4-D) and 4-chloro-2-metylphenoxyacetic acid (MCPA) from aqueous solution onto activated carbons derived from various lignocellulosic materials including willow, miscanthus, flax, and hemp shives was investigated. The adsorption kinetic data were analyzed using two kinetic models: the pseudo-first order and pseudo-second order equations. The adsorption kinetics of both herbicides was better represented by the pseudo-second order model. The adsorption isotherms of 2,4-D and MCPA on the activated carbons were analyzed using the Freundlich and Langmuir isotherm models. The equilibrium data followed the Langmuir isotherm. The effect of pH on the adsorption was also studied. The results showed that the activated carbons prepared from the lignocellulosic materials are efficient adsorbents for the removal of 2,4-D and MCPA from aqueous solutions. |
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| Keywords: | Activated carbon adsorption agricultural waste 2 4-D MCPA |
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