Study about Doping Ion La³⁺ onto Surface of Pyrolusite Ore for Removing Simultaneously Both Fluoride and Phosphate from Wastewater

Table 2

Calculated equilibrium constants using the Langmuir and Freundlich equations for phosphate and fluoride adsorption on the LDPO.

	Temp.; (°C)	Langmuir			Freundlich
		(mg/g)	(L/mg)			(mg/g)
Phosphate	20	83.33	0.026	0.994	10.8	33.7	0.909
	30	76.92	0.023	0.990	9.43	18.8	0.932
	40	66.67	0.021	0.986	6.67	14.1	0.951
Fluoride	20	12.82	0.607	0.993	1.67	2.83	0.941
	30	10.56	0.283	0.995	1.79	5.83	0.873
	40	9.43	0.159	0.994	1.43	9.53	0.901