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Ecological Processes

Table 2 Adsorption kinetic parameters of Cd2+ on rBC, Sep, and rBC + Sep

From: Passivation remediation of weakly alkaline Cd-contaminated soils using combined treatments of biochar and sepiolite

Samples

Quasi-first-order kinetic model

Quasi-second-order kinetic model

qe (mg·g–1)

K1 (min–1)

R2

qe (mg·g–1)

K2 (g·mg−1·min–1)

R2

rBC

14.05

0.27

0.74

14.65

0.029

0.92

Sep

8.85

0.12

0.80

9.28

0.019

0.93

rBC + Sep

34.17

0.10

0.94

35.92

0.004

0.97

  1. Adsorption capacity of Cd2+ at adsorption equilibrium (qe; mg·g−1), Rate constant of the pseudo-first-order kinetic model (K1; min−1), Rate constant of the quasi-second-order kinetic model (K2; g·mg−1·min−1)
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