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Table 3 Comparison between adsorption rate constant, the estimated qe and the coefficients of determination associated with pseudo-first-order, pseudo-second-order and intra-particle diffusion kinetic models applied to nickel and cadmium adsorption by Cystoseria indica at 25 °C

From: Simultaneous biosorption of nickel and cadmium by the brown algae Cystoseria indica characterized by isotherm and kinetic models

Kinetic models

Parameters

Nickel

Cadmium

Pseudo-first-order

qe (mg/g)

18.70

39.201

k1 (1/min)

0.112

0.212

R2

0.831

0.741

Pseudo-second-order

qe (mg/g)

24.592

45.272

k2 (g/mg.min)

0.003

0.002

R2

0.864

0.811

Intra-particle diffusion

C (mg/g)

15.542

32.031

kid (mg/g.min0.5)

1.726

2.942

R2

0.90

0.930