• Pastrana Martinez, Lm
• Moreno Castilla, C.
• Lopez Ramon, Mv
• Joly, Jp
• Perrard, A.
• Morlay, C.

Abstract

Fluroxypyr is a widely used herbicide whose presence in natural waters has prompted research into its removal by adsorption. This article reports a kinetics study of fluroxypyr adsorption on a commercial activated carbon. The experimental study used a micro differential column batch reactor operated at three solution flow rates and two initial fluroxypyr concentrations, establishing a differential regime in order to obtain correct experimental data. Initial rates at zero coverage permitted the external transfer coefficient k L to be calculated. Internal surface diffusion coefficients D S were determined by using the Homogeneous Surface Diffusion Model running the FAST software and taking advantage of tabulated user-oriented solutions. This model satisfactorily fits the experimental data. DS values were 2.5×10 -14 and 4.2×10 -14m 2 s -1 for initial concentrations of 30 and 50 mg/L, respectively. These values were confirmed by experiments in a widely used shaken batch reactor with a determined k L value. © Taylor & Francis Group.

Topics

• impedance spectroscopy
• surface
• Carbon
• experiment