Synthesis of Zeolites Materials Using Fly Ash and Oil Shale Ash and Their Applications in Removing Heavy Metals from Aqueous Solutions

Table 3

Langmuir and Freundlich isotherm parameters for the adsorption of lead, zinc, and chromium onto ZV4 and ZM4.

ZV4
Metal ions	Langmuir model			Freundlich model
	(mg/g)	(l/mg)		(mg/g)
Lead	25.64	0.48	0.990	23.57	0.01	0.751
Zinc	34.24	0.58	0.993	30.87	0.02	0.867
Chromium	10.41	0.8	0.957	9.29	0.01	0.745
ZM4
Lead	34.96	0.4	0.991	32.78	0.008	0.918
Zinc	29.41	0.87	0.957	31.50	0.02	0.880
Chromium	11.49	0.05	0.971	10.69	0.006	0.889