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Table 4 Parameters obtained from the kinetic study of adsorption of glyphosate onto ferrihydrite

From: The effect of pH and ionic strength on the adsorption of glyphosate onto ferrihydrite

Model applied Parameters Values
Pseudo-first-order k1 0.0023
qe 0.61
R2 0.083
Pseudo-second-order k2 0.0032
qe 48.8
R2 0.991
Intra-particle diffusion kp 0.390
C 40.9
R2 0.227
  1. Experiments were carried out at temperature 307.6 K. Each value is a mean of three results. qe is the glyphosate adsorption capacity for adsorbent (mg g−1) at equilibrium; k1 is the rate constant of pseudo-first-order kinetic model (min−1); k2 is the rate constant of pseudo-second-order kinetic model (g mg−1 min−1); kp is the intra-particle diffusion rate constant (g mg−1 min−0.5); C is the intercept, which represent the thickness of the boundary layer