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

Figure 8

SEM micrographs of (a) untreated shoot biomass, (b) filter with Cr³⁺ precipitated at pH 7 ± 0.1, (c) filter with Pb²⁺ precipitated at pH 7 ± 0.1, (d) shoot biomass treated with 1.5 mmol L⁻¹ Pb²⁺ at pH 5 ± 0.1, (e) shoot biomass treated with 1.5 mmol L⁻¹ Pb²⁺ at pH 7 ± 0.1, and (f) shoot biomass treated with 1.5 mmol L⁻¹ Cr³⁺ at pH 7 ± 0.1.

(a)

(b)

(c)

(d)

(e)

(f)