Removal of Phosphate from Aqueous Solutions Using Chemically Synthesized Vaterite Polymorph of Porous Calcium Carbonate Nanoparticles under Optimized Conditions

Table 3

Adsorption parameters of the Langmuir and Freundlich isotherms at room temperature for the adsorption of phosphate on VPPCC nanoparticles.

Model/parameters		Linear expression			Nonlinear expression
		Value	Standard error	Root mean square error	Value	Standard error	Root mean square error
Langmuir	(mg/g)	1.87	0.017	1.015	1.82	0.031	2.588
	(L/mg)	0.70	0.024		3.45	0.609
		0.99	—		0.95	—
Freundlich	(mg/g) (mg/L)^-1/	1.31	0.022	0.026	1.31	0.076	3.333
		11.88	0.015		11.44	2.353
		0.08	—		0.09	—
		0.84	—		0.92	—