Study of the Equilibrium, Kinetics, and Thermodynamics of Boron Removal from Waters with Commercial Magnesium Oxide

Table 2

Parameters for the isotherms obtained from the Langmuir, Freundlich, and Dubinin–Radushkevich models at 25°C, 40°C, and 50°C, respectively.

Temperature (°C)	Langmuir			Freundlich			DR
	(mg·g^−1)	B (mg·L^−1)	R^2	n		R^2	R^2
25	34.72	0.004	0.91	1.392	0.33	0.99	0.84
40	35.08	0.005	0.93	1.476	0.51	0.99	0.83
50	36.11	0.006	0.93	1.481	0.57	0.99	0.83

DR: Dubinin–Radushkevich isotherm. Initial boron concentration = 350 mg·L⁻¹, stirring speed = 150 rpm, pH = 10, and t = 240 min.