Table 4 Parameters of intraparticle diffusion and Elovich kinetic models for adsorption of MB on SiO2/PANI-SDS (0.02 g), pH 6 ± 0.1, T = 30 °C.

From: Nano-silica from white silica sand functionalized with PANI-SDS (SiO2/PANI-SDS) as an adsorbent for the elimination of methylene blue from aqueous media

[MB]o (mg/L)

Intraparticle diffusion model

Elovich model

kp1 (mg g−1 min0.5)

R2

kp2 (mg g−1 min0.5)

R2

α (mg g−1 min−1)

β (g mg−1)

Chi2

R2

3.471

2.307

0.99

1.077

0.99

6.336

0.566

0.07

0.98

11.107

6.614

0.99

1.473

0.98

5.684

0.219

0.51

0.98

11.640

2.915

0.99

0.452

0.94

2.223

0.166

0.75

0.98

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