In this study, the potential biosorption characteristics of the submerged aquatic plant Nasturtium officinale was investigated for the removal of the chlorophenoxy acid derivates, namely, 2,4-dichlorophenoxy acetic acid (2,4-D), 2,4-dichlorophenoxy propanoic acid (2,4-DP) and 2,4-dichlorophenoxy butyric acid (2,4-DB). The experiments were performed as simultaneous biosorption of the studied pesticides. Optimum biosorption conditions were determined as a function of pH, contact time and initial pesticidec concentrations. The concentrations of the pesticides in the remaining solutions after biosorption were simultaneously analyzed by high performance thin layer chromatography (HPTLC). The experimental adsorption data were fitted both the Langmuir and Freundlich adsorption models to describe the biosorption isotherm of the pesticides by aquatic plant Nasturtium officinale used as biomass. The highest pesticide uptake was calculated from Langmuir isotherm and found to be 11.24 mg g-1 for 2,4-DP.
Keywords: Pesticides, biosorption, HPTLC , Nasturtium officinale