Valorisation of Pine Cone as an Efficient Biosorbent for the Removal of Pb(II), Cd(II), Cu(II), and Cr(VI)

Figure 3

(a) Effect of the adsorbent concentration on the metal uptake percentage of Pb(II), Cu(II), Cd(II), and Cr(VI) (), , , and  h (). (b) Effect of the initial metal concentration on the metal uptake percentage of Cd(II), Cu(II), Pb(II), and Cr(VI) (), adsorbent ,  h, and ().

(a)

(b)