The parameters of kinetic models for the adsorption of Cr(vi) onto CCBC.

Types of models	Parameters	Values
Experiment	C 0 (mg L−1)	83.76
	q e(exp) (mg g−1)	24.17
Pseudo-first-order	q e(cal) (mg g−1)	22.51
	k 1 (min−1)	0.16
	RMSE	1.69
	R 2	0.66
	χ 2	1.76
Pseudo-second-order	q e(cal) (mg g−1)	23.66
	k 2 (g mg−1 min−1)	0.01
	RMSE	0.81
	R 2	0.92
	χ 2	0.40
Intraparticle diffusion	K d	0.62
	C	16.07
	RMSE	0.74
	R 2	0.89
	χ 2	0.55
Elovic	α (mg g−1 min−1)	791
	β (mg g−1)	0.47
	RMSE	0.44
	R 2	0.98
	χ 2	0.13