Biosorption Studies of Cd²⁺ and Cr⁶⁺ from Aqueous Solution Using Cola-Nut Leaves as Low-Cost Biosorbent

Figure 9

Linear plots of (a) pseudo-first-order and (b) pseudo-second-order for Cd²⁺ adsorption by ATK and (c) pseudo-first-order and (d) pseudo-second-order for Cr⁶⁺ adsorption by ATK. Linear plots of (e) pseudo-first-order and (f) pseudo-second-order for Cd²⁺ adsorption by UTK and (g) pseudo-first-order and (h) pseudo-second-order for Cr⁶⁺ adsorption by UTK.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)