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Adsorption isotherms of Cd(II), Pb(II) and Zn(II) fitted with the Dubinin-Radushkevich, Freundlich, Langmuir, Temkin and Hill sorption models. Biochar dose 1.25 g.L−1, the initial pH of the background solution was pH 5 for Pb(II), pH 6.5 for Cd(II) and pH 7.5 for Zn(II) with a contact time of 24 h and t = 22 ± 2 °C.
