Adsorption of Pb(II) from Water onto ZnO, TiO₂, and Al₂O₃: Process Study, Adsorption Behaviour, and Thermodynamics

Table 2

Isotherm parameters related to the adsorption of Pb(II) onto adsorbents.

Adsorption isotherms	Isotherm parameters		ZnO	TiO2	Al2O3
Langmuir		mg/g	55.04	58.88	78.49
		L/mg	0.429	0.144	0.034
			0.9946	0.9619	0.7859
Freundlich		mg/g (mg/L)^−1/n	26.94	17.26	4.91
			5.40	3.38	1.63
			0.4712	0.5012	0.7594
Temkin		mg/L	7.10	10.78	20.00
		L/mg	41.80	11.10	0.26
			0.5340	0.5671	0.8127
Dubinin-Radushkevich		mg/g	53.96	53.66	53.64
		mol^2/J^2
			0.6220	0.6528	0.9588