Biosorption of Cr(III) and Pb(II) by Schoenoplectus californicus and Insights into the Binding Mechanism

Figure 3

Sorption of Cr³⁺ (a) and Pb²⁺ (b) by the biomass of S. californicus (15 g L⁻¹) as a function of the contact time at pH 5 ± 0.1 and 7 ± 0.1 (initial metal concentration: 1.5 mM; temperature: 25°C). Vertical bars indicate the standard deviation of three replicates, and the letters indicate the groups that correspond to the significant (𝑃<0.05) differences.

(a)

(b)