Table 2 Kinetic parameters using pseudo-first order and pseudo-second order models of RR2 with Cr/NiONPs.

Conc. of dye mg/L	Pseudo-first order kinetic model				Pseudo-second order kinetic model
Conc. of dye mg/L	q_e,exp (mg/g)	q_e,cal (mg/g)	k₁ (min⁻¹)	R²	q_e,cal (mg/g)	k₂ (g/mg min)	R²
10	9.720	11.350	6.498	0.978	10.989	0.171	0.994
20	17.791	21.321	6.576	0.982	19.723	0.207	0.996
30	25.786	33.112	6.516	0.981	28.248	0.225	0.998
40	33.604	37.037	3.748	0.982	35.842	0.335	0.999
50	41.015	46.082	3.140	0.954	43.103	0.412	0.999
60	49.593	54.347	2.550	0.978	51.813	0.439	0.999

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