Table 9 Correlation values and kinetic parameters obtained from adsorption kinetic plots for the removal of MG dye by rGO/ -Fe2O3 nanocomposite. The adsorption conditions were pH 8, 122 mg/100 mL rGO/-Fe2O3 dose, 80 ppm MG dye solution, 25 °C temperature and different contact times (10, 20, 30, 40, 50 and 60 min).

From: Response surface methodology for the design of malachite green dye removal by γ-Fe2O3 dispersed on reduced graphene oxide sheets

Pseudo-1st order model

Pseudo-2nd order model

k1(min− 1)

qe(mg g− 1)

R2

k2(g mg− 1min− 1)

qe(mg g− 1)

R2

0.108

172.86

0.786

4.6 × 10− 5

153.85

0.978

Elovich model

Intraparticle diffusion model

α (mg g− 1min− 1)

β (g mg− 1)

R2

kint.(mg g− 1min− 1)

C (mg g− 1)

R2

2.92

0.054

0.969

7.158

-12.535

0.994 (step-1)

1.614

28.426

0.855 (step-2)

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