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Table 3 Kinetic model parameters for the adsorption of NO3–N, PO4–P and [Cr]T onto the pumice (pH = 9.1, T°= 21 °C)

From: Identification of two low-cost and locally available filter media (pumice and scoria) for removal of hazardous pollutants from tannery wastewater

Pollutants

Initial conc. (g/L)

Pseudo-first-order kinetic

Pseudo-second-order kinetic

q e , exp. (g/kg)

q e , cal. (g/kg)

K1 (h−1)

R 2

q e , cal. (g/kg)

K 2 (kg g−1 h−1)

R 2

NO3–N

0.124

1.160

1.140

0.020

0.9969

1.302

0.024

0.6419

PO4–P

0.168

1.080

1.010

0.030

0.9711

1.189

0.049

0.8604

[Cr]T

0.0357

0.268

0.267

0.035

0.9999

0.276

0.415

0.8938