Table 3. Isotherm fitting parameters for Cd(ii) removal.

		SBC	Fe@SBC	P@SBC	P–Fe@SBC
Langmuir	q max (mg g−1)	86.356	177.809	209.644	328.947
	K L (L mg−1)	0.078	0.151	0.242	0.469
	R 2	0.999	0.998	0.998	0.999
Freundlich	K f (mg1−n Ln g−1)	45.334	52.563	70.238	110.167
	n	7.137	3.972	4.244	3.910
	R 2	0.748	0.966	0.879	0.941
Temkin	A T (1/g)	175.874	6.252	14.193	26.242
	B T (kJ mol−1)	8.747	25.305	27.470	41.424
	R 2	0.774	0.908	0.974	0.923