Table 2. Constant Parameters and Correlation Coefficients Calculated for Different Adsorption Isotherm Models for CR Adsorption on IONPs.

model and equations	constants
Langmuir	qm (mg/g)	108.10
	RL (C0 = 5 mg/L)	0.6802
	C0 = 10 mg/L	0.0961
	C0 = 20 mg/L	0.0505
	C0 = 30 mg/L	0.0342
	C0 = 40 mg/L	0.0259
	b (L/mg)	0.94
	R2	0.9726
Freundlich	n	0.2369
	KF (mg/g(L/mg)1/n)	51.70
	R2	0.7650
Temkin	bT	67.71
	AT (L/g)	36.59
	B (J/mol)	83.45
	R2	0.5702