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

Table 3

Comparison of Langmuir and Freundlich adsorption capacities (mg/g) of various materials for removal of phosphate and fluoride.

	Adsorbents	Langmuir adsorption capacity (mg/g)	Freundlich adsorption capacity (mg/g)	References
Phosphate	Fe-Mn binary oxide	33.2	27.0	[1]
	Hydrous niobium oxide	15.0	2.9	[3]
	Calcined cobalt hydroxide	2.5–153.0	0.02–18.2	[43]
	Nano-structured Fe-Ti bimetal oxide	35.4–40.9	8.97–10.0	[42]
	La-doped vesuvianite	6.70	1.96	[44]
	La-coordinated silicates material	50.3–54.3	20.6–32.4	[2]
	La (OH)3/zeolite	6.05–71.9	—	[45]
	La-modified tourmaline	67.1–108.7	7.53–17.7	[46]
	La-doped Pyrolusite ore (LDPO)	66.7–76.9	14.1–33.7	Present study
Fluoride	Mixed rare earth oxides	196.1	—	[33]
	Low cost materials	0.19–4.54	0.023–10.5	[4]
	Ti-based adsorbents	25.8–46.6	2.18–15.8	[62]
	MnO2-coated tamarind fruit	0.21–0.22	—	[47]
	Mn-Ce oxide	137.5	—	[48]
	La-modified activated alumina	2.74	1.26	[49]
	La-loaded bentonite/chitosan beads	3.70–8.55	0.24–0.45	[50]
	La-Al loaded scoria	23.9	1.25	[51]
	La-doped Pyrolusite ore (LDPO)	9.43–12.82	2.83–9.53	Present study