Adsorbing Thermodynamics and Kinetics of Resin D301M to Glyphosate Solution

The adsorbing kinetics and thermodynamics of resin D301M to glyphosate solution were investigated by implementation of state adsorption experiments. The adsorption isotherm and kinetics in the range from 303.15 to 318.15 K were determined. Langmuir, Freundlich, and Temkin isotherm equations were employed to describe the adsorption process and fit the experimental data. The results indicate that the Langmuir isotherm function fits the data better. The parameters of adsorbing thermodynamic, ΔH, ΔG and ΔS were calculated. The kinetics of the resin D301M adsorbing process follows a pseudo-second-order model. It is found that, under low temperature, the diffusion of liquid sheet and chemical reaction are the dominant procedure, but, with the temperature increasing, the ion particle diffusion becomes the dominant procedure gradually. According to the Arrhenius equation, the calculated apparent activation energy is 165.22 kJ·mol^-1.