Adsorption isotherm and kinetics of 2,4-dichlorophenoxyacetic acid (2,4-D) herbicide on
activated carbon prepared from Barhi date seeds were determined from batch tests. The effects of contact
time, initial herbicide concentration and solution temperature were investigated. The adsorption
equilibrium data were processed in accordance with the three most widely used adsorption isotherms:
Langmuir, Freundlich and Temkin isotherm models. The equilibrium data were best represented by
Langmuir isotherm model, showing maximum monolayer adsorption capacity of 175.4 mg/g. The kinetic
data were also examined with the pseudo-first-order and pseudo-second-order models, and was found to
follow closely the pseudo-second-order kinetic model. Thermodynamic parameters such as standard
enthalpy (ΔHo
), standard entropy (ΔSo
) and standard free energy (ΔGo
) were evaluated. The adsorption
interaction was found to be endothermic in nature.
Adsorption isotherm and kinetics of 2,4-dichlorophenoxyacetic acid (2,4-D) herbicide onactivated carbon prepared from Barhi date seeds were determined from batch tests. The effects of contacttime, initial herbicide concentration and solution temperature were investigated. The adsorptionequilibrium data were processed in accordance with the three most widely used adsorption isotherms:Langmuir, Freundlich and Temkin isotherm models. The equilibrium data were best represented byLangmuir isotherm model, showing maximum monolayer adsorption capacity of 175.4 mg/g. The kineticdata were also examined with the pseudo-first-order and pseudo-second-order models, and was found tofollow closely the pseudo-second-order kinetic model. Thermodynamic parameters such as standardenthalpy (ΔHo), standard entropy (ΔSo) and standard free energy (ΔGo) were evaluated. The adsorptioninteraction was found to be endothermic in nature.
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