Fig. 4
From: Adsorption of Fe-modified peanut shell biochar for Pb(II) in mixed Pb(II), Cu(II), Ni(II) solutions
Qualitative analysis of biochar: (a) original BC, (b) original Fe@BC, (c) BC after adsorption, and (d) Fe@BC after adsorption in mixed metal ions solution (conditions: V = 80 mL, pH = 4.0, C0 = 100 mg/L, t = 24 h, T = 25 °C).
