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(a) The adsorption capacity of BC, BC/GO-1, BC/GO-2, and BC/GO-3, (b) effect of contact time on the adsorption of Pb(II) onto BC and BC/GO-1 at an initial pH of 5.0, and (c) effect of the initial concentration of Pb(II) on the adsorption capacity onto BC and BC/GO-1; experimental conditions: initial concentration, 5–100 mg/L; sample dose, 0.4 g/L; pH, 5.0; temperature, 28 ± 2 °C; contract time, 90 min.
