Studies on the Removal of Cadmium Toxic Metal Ions by Natural Clays from Aqueous Solution by Adsorption Process

Table 5

Comparison of adsorption capacities of Cd (II) on various adsorbents.

Adsorbent	Qmax (mg/g)	Reference
Goethite	3.83	[33]
Perlite	0.64	[34]
Natural zeolites	5.17	[35]
Sepiolite	5.69	[16]
Montmorillonite	6.30	[36]
Pure smectite	3.87	[37]
Raw kaolinite	0.703	[38]
Phosphate	1.7–7.5	[39]
Kaolinite	6.80	[16]
Bentonite	8.45	[40]
Vermiculite	0.099	[41]
Goethite	1.07	[42]
Nigerian bentonite	4.08	[43]
Brasgel clay	0.84	[44]
QC-MT	5.85	This work
QC-MC	4.23	This work