Table 2.

Adsorption isotherm parameters of Au (III) onto functionalized Amberlite XAD7 with glutamic acid.

	Parameters	XAD7-glutamic acid
Experimental values
	qm,exp(mg/g)	14.23
Isotherm models
Langmuir	qL (mg/g)	17.6
	KL (L/mg)	0.17
	R2	0.9557
Freundlich	KF (mg/g)	3.75
	1/nF	0.39
	R2	0.8004
Sips	qs (mg/g)	14.9
	K s	0.32
	1/ns	−0.71
	R2	0.9972