Fig. 5From: Kinetics, equilibrium, and thermodynamics investigation on the adsorption of lead(II) by coal-based activated carbonLangmuir (a) and Freundlich (b) adsorption isotherm of Pb(II) on CBAC [temperature: 298 K; contact time: 60 min; pH: 5.0; initial Pb(II) concentration: 50–300 mg/L; CBAC dosage: 1.2 g/L (w/v)]Back to article page