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Langmuir and Freundlich adsorption isotherms for Cd(II) (a). The adsorption isotherms were calculated using the linearised forms of the Langmuir (b) and Freundlich (c) models. Conditions: samples, magnetic char and magnetic lignite; batch-type system; sorbent concentration, 2 g/L; initial metal concentration, 10–464 mg/L; room temperature; 24 h).
