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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
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Geochemical Transactions

ISSN: 1467-4866

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