Fitting parameters of the Langmuir and Freundlich models for sorption of Pb²⁺ onto GO–PDMS.

Langmuir fitting parameters		Freundlich fitting parameters
q max (mg g−1)	3.2	K F [(mg g−1) (L mg−1)1/n]	0.9
K L (L mg−1)	0.3	1/n	0.3
R 2	0.98	R 2	0.90