Competitive Adsorption of Cadmium(II) and Mercury(II) Ions from Aqueous Solutions by Activated Carbon from Xanthoceras sorbifolia Bunge Hull

Table 3

Langmuir and Freundlich isotherm parameters for the adsorption of Cd(II) and Hg(II) on XLAC in single-metal systems (adsorption experiments, Cd(II): = 50 mg, = 50 mL, = 0.0052 mol·L⁻¹, pH = 5.5, = 40°C, t = 300 min, and revolution rate = 200 revolutions·min⁻¹; Hg(II): = 50 mg, = 50 mL, = 0.0052 mol·L⁻¹, pH = 5.5, = 35°C, 40°C, and 45°C, t = 300 min, and revolution rate = 200 revolutions·min⁻¹).

System	Langmuir isotherm model					Freundlich isotherm model
		qm (mg·g^−1)		SE		(mol·g^−1)			SE
Cd(II)	0.0146	388.7	0.9912	1.775 × 10^−4	1.856 × 10^−5	94.8883	1.9487	0.7347	0.0160	0.0018
Hg(II)	0.2462	235.6	0.9882	3.774 × 10^−5	3.340 × 10^−5	134.0617	6.0716	0.8460	0.0221	0.0059