Table 1. Summary of the kinetics parameters determined from the linear and nonlinear pseudo-first-order models.

Catalyst	Linear pseudo 1st-order		Non-linear pseudo 1st-order
	Parameters	Values	Parameters	Values
GO	K 1 (min−1)	0.00458	Calculated qe (mg g−1)	12.81
	R 2	0.933	K 1 (min−1)	2.31 × 10−5
			R 2	0.933
R-GO	K 1 (min−1)	0.00616	Calculated qe (mg g−1)	42.02
	R 2	0.980	K 1 (min−1)	8.92 × 10−5
			R 2	0.98
Cu@GO	K 1 (min−1)	0.0130	Calculated qe (mg g−1)	72.54
	R 2	0.942	K 1 (min−1)	0.016
			R 2	0.963
Cu@R-GO	K 1 (min−1)	0.0154	Calculated qe (mg g−1)	76.93
	R 2	0.965	K 1 (min−1)	0.017
			R 2	0.98