Table 1.

Estimated constants of the kinetic parameters of Cr (VI) on ATP–CPBr@CA composite beads.

Kinetic models and parameters	Concentration (mg/L)
	50	100	200	300
qe, exp(mg/g)	85.17	137.09	211.09	267.29
Pseudo 1st order
qe,cal (mg/g)	54.19	98.07	152.49	179.59
k1 (min−1)	0.040	0.030	0.028	0.025
R2	0.953	0.995	0.995	0.986
Pseudo 2nd order
qe,cal (mg/g)	91.74	151.52	240.38	294.11
k2 (g mg−1 min−1)	0.0015	0.0005	0.0003	0.0002
R2	0.998	0.995	0.991	0.994
Elovich
α (mg/g min)	82.43	60.45	86.37	113.66
β (g/mg)	0.078	0.042	0.028	0.022
R2	0.987	0.966	0.942	0.973