Aminopropyl Functionalised MCM-41: Synthesis and Application for Adsorption of Pb(II) and Cd(II)

Table 5

Results of the paired-samples t-test analysis of adsorption of Pb(II) and Cd(II) on aminopropyl-MCM-41.

For adsorption of Pb(II)			For adsorption of Cd(II)
Isotherm			Isotherm
Langmuir (nonlinear)	0.001	1.000	Redlich–Peterson (nonlinear)	0.001	1.000
Freundlich (nonlinear)	0.001	1.000	Sips (nonlinear)	0.001	1.000
Redlich–Peterson (nonlinear)	−0.014	0.989	Langmuir (nonlinear)	0.002	0.999
Sips (nonlinear)	−0.014	0.989	Freundlich (nonlinear)	−0.007	0.994
Langmuir 3	0.013	0.989	Langmuir 3	0.095	0.925
Langmuir 5	0.061	0.952	Redlich–Peterson (linear)	0.101	0.920
Langmuir 4	−0.139	0.891	Langmuir 5	−0.221	0.827
Redlich–Peterson (linear)	−0.848	0.404	Freundlich (linear)	0.299	0.767
Freundlich (linear)	0.896	0.379	Langmuir 4	−0.463	0.647
Langmuir 1	−15.632	<0.001	Sips (linear)	−0.781	0.442
Langmuir 2	−15.921	<0.001	Langmuir 1	−1.179	0.249
Sips (linear)	−13.671	<0.001	Langmuir 2	−1.641	0.113