Langmuir model			Freundlich model
	q e (mg g−1)	K L (L mg−1)	R 2	K F (mg g−1)	N	R 2
Cu(ii)	95.602	0.178	0.999	18.250	2.527	0.898
Zn(ii)	79.365	0.250	0.999	24.574	3.354	0.912
Cd(ii)	58.823	0.288	0.998	17.131	3.147	0.912
Pb(ii)	36.63	0.400	0.999	18.840	6.146	0.924