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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