Table 1.

Isotherm parameters of NRPA in the adsorption of CR.

Isotherms	Parameter	CR
Langmuir	Qmax (mg g−1)	98.216
	b (L mg−1)	0.228
	RL	0.376
	R2	0.996
	%SSE	0.04
	RMSE	0.02
Freundlich	KF ((mol g−1) (mol L−1)−1/n	44.562
	1/n	0.116
	R2	0.987
	%SSE	0.13
	RMSE	0.35
Temkin	aT (L mg−1)	0.2422
	bT	26.3271
	R2	0.9770
	%SSE	0.25
	RMSE	0.33
Dubinin–Radushkevich	Qs (mg g−1)	79.355
	β (mol J−1)2	3.17
	E (kJ mol−1)	0.595
	R2	0.994
	%SSE	0.13
	RMSE	0.22