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Table 4 Kinetic parameters for the adsorption of NO3–N, PO4–P and [Cr]T onto the scoria (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 0.250 0.249 0.032 0.9951 0.282 0.19 0.8535
PO4–P 0.168 0.210 0.149 0.053 0.8769 0.220 0.87 0.9806
[Cr]T 0.0357 0.051 0.025 0.039 0.4690 0.539 2.61 0.9294