Adsorption Removal of Environmental Hormones of Dimethyl Phthalate Using Novel Magnetic Adsorbent

Table 2

Values of isotherm parameters and correlation coefficients ()^a with different initial pH values.

	Langmuir isotherm			Freundlich isotherm			Dubinin-Radushkevich isotherm
	(mg g^−1)	(m^3 g^−1)		((mg g^−1)(g m^−3))			(mol^2 J^−2)	(kJ mol^−1)	(mg g^−1)
5^c	4.01	0.12	0.97	0.80	2.59	0.92	1.00 × 10^−8	7.04	3.8	0.91
6.04–6.64^c	5.21	0.056	0.94	0.60	2.19	0.97	1.19 × 10^−8	6.48	3.84	0.90
7^c	4.22	0.15	0.95	0.95	2.59	0.81	0.96 × 10^−8	7.19	4.32	0.85

, , and are correlation coefficients by means of fitting the experimental data to Langmuir, Freundlich, and Dubinin-Radushkevich isotherms, respectively.
^bThe ranges of the equilibrium concentrations of the experiments performed are 0.61–92.9, 0.82–91.1, and 0.52–91.3 mg L⁻¹ for pH₀ of 5, 6.04–6.64, and 7, respectively.
^cThe final pH values of solutions at the end of experiments were about 7.36–7.87, 6.9–8.05, and 7.42–8.39 for pH₀ = 5, 6.04–6.64, and 7, respectively.