Langmuir parameters for the adsorption of Pb²⁺ by Bir-H₂O₂ at different pH values and background electrolytes and Bir-HCl at pH 5.

		A max (mmol kg−1)	k	R 2
Bir-H2O2	pH = 3.5	1471	239	0.99
	pH = 4.5	2205	724	0.99
	pH = 5.5	3006	391	0.99
Bir-HCl	pH = 3.5	1606	207	0.76
	pH = 4.5	1858	181	0.95
	pH = 5.5	2285	288	0.91