Near-Stoichiometric Adsorption of Phosphate by Silica Gel Supported Nanosized Hematite

Table 2

Parameters of the Langmuir equations and Fe³⁺ : PO₄³⁻ molar ratio for adsorbates.

Sample	𝐴∞, mg/g		𝐾, L/g	𝐴max., mg/g		Fe^3+ : PO4^3− molar ratio on the surface
	Per 1 g; of the sorbent	Per 1 g; of hematite		Per 1 g; of the sorbent	Per 1 g; of hematite
pH = 4
A	14.57±1.03	2345±166	3.57±1.28	12.2	1964	1 : 1.66
B	9.28±0.46	742±37	0.59±0.14	8.4	672	1 : 0.56
pH = 8
A	5.57±0.37	897±60	4.13±1.53	5.2	837	1 : 0.70
B	6.51±0.28	521±22	0.19±0.02	5.2	416	1 : 0.35