Figure 2

Adsorption of Cr(III), Cd(II), Cu(II), and Pb(II) ions by CO, CL, ZO, ZL, FO, FL and LO in the multiple-metal aqueous system. Initial metal concentration of 0.18 mmol of each metal, contact time of 24 h, initial pH of 4.0, and 25 mg of adsorbent in 2.5 ml of initial solution.