Removal of Pb(II) from Aqueous Solutions with Manganese Oxide-Modified Diatomite

Table 4

Parameters of the nonlinear models for the adsorption of Pb(II) in an aqueous solution on Mn/diatomite, natural diatomite, and nano-MnO₂.

Isotherm model	Parameter	Adsorbent
		Mn/diatomite	Natural diatomite	Nano-MnO2
Langmuir (2p)	(L g^-1)	1.18	4.98	7.54
	(mg g^-1)	81.42	16.31	19.42
	RMSE	10.17	1.63	0.73
Freundlich (2p)	(mg^(1-1/n) L^1/n g^-1)	41.09	11.20	15.43
		5.54	5.95	10.35
	RMSE	3.46	0.49	1.45
Sips (3p)	(L^m mg^m-1)	0.27	0.05	18.49
	(mg g^-1)	188.74	240.09	18.93
		0.28	0.18	1.58
	RMSE	3.10	0.50	0.62

Number of parameters.